Lint Report

Overview

	Correctness
2	DiscouragedPrivateApi: Using Discouraged Private API
1	PictureInPictureIssue: Picture In Picture best practices not followed
2	SelectedPhotoAccess: Behavior change when requesting photo library access
8	RestrictedApi: Restricted API
1	UnsafeOptInUsageError: Unsafe opt-in usage intended to be error-level severity
	Correctness:Messages
1	PluralsCandidate: Potential Plurals
1	StringFormatCount: Formatting argument types incomplete or inconsistent
	Security
1	AcceptsUserCertificates: Allowing User Certificates
1	CustomX509TrustManager: Implements custom TLS trust manager
1	ExportedService: Exported service does not require permission
1	InsecureBaseConfiguration: Insecure Base Configuration
2	WebViewClientOnReceivedSslError: Proceeds with the HTTPS connection despite SSL errors
1	DataExtractionRules: Missing data extraction rules
	Performance
15	NotifyDataSetChanged: Invalidating All RecyclerView Data
1	ObsoleteSdkInt: Obsolete SDK_INT Version Check
1	ViewHolder: View Holder Candidates
1	Overdraw: Overdraw: Painting regions more than once
62	UnusedResources: Unused resources
1	UselessParent: Unnecessary parent layout
1	TooManyViews: Layout has too many views
	Internationalization
4	SetTextI18n: TextView Internationalization
	Included Additional Checks (82)
	Disabled Checks (45)

Using Discouraged Private API

../../src/main/java/com/nextcloud/talk/account/WebViewLoginActivity.kt:293: Reflective access to mX509Certificate, which is not part of the public SDK and therefore likely to change in future Android releases

 290   override fun onReceivedSslError(view: WebView, handler: SslErrorHandler, error: SslError) {
 291       try {
 292           val sslCertificate = error.certificate
 293           val f: Field = sslCertificate.javaClass.getDeclaredField("mX509Certificate")    
 294           f.isAccessible = true
 295           val cert = f[sslCertificate] as X509Certificate
 296           if (cert == null) {

 290   override fun onReceivedSslError(view: WebView, handler: SslErrorHandler, error: SslError) {
 291       try {
 292           val sslCertificate = error.certificate
 293           val f: Field = sslCertificate.javaClass.getDeclaredField("mX509Certificate")    
 294           f.isAccessible = true
 295           val cert = f[sslCertificate] as X509Certificate
 296           if (cert == null) {

DiscouragedPrivateApi Correctness Warning Priority 6/10

Picture In Picture best practices not followed

../../src/main/AndroidManifest.xml:83: An activity in this app supports picture-in-picture and the targetSdkVersion is 31 or above; it is therefore strongly recommended to call both setAutoEnterEnabled(true) and setSourceRectHint(...)

  80         android:protectionLevel="signature" />
  81     <uses-permission android:name="${applicationId}.${broadcastPermission}" />
  82 
  83     <application                                                                                    
  84         android:name=".application.NextcloudTalkApplication"
  85         android:allowBackup="true"
  86         android:fullBackupContent="@xml/backup_config"

Starting in Android 12, the recommended approach for enabling picture-in-picture (PiP) has changed. If your app does not use the new approach, your app's transition animations will be of poor quality compared to other apps. The new approach requires calling setAutoEnterEnabled(true) and setSourceRectHint(...).

More info: https://developer.android.com/develop/ui/views/picture-in-picture#smoother-transition

To suppress this error, use the issue id "PictureInPictureIssue" as explained in the Suppressing Warnings and Errors section.

PictureInPictureIssue Correctness Warning Priority 5/10

Behavior change when requesting photo library access

../../src/main/AndroidManifest.xml:63: Your app is currently not handling Selected Photos Access introduced in Android 14+

  60     <uses-permission
  61         android:name="android.permission.READ_EXTERNAL_STORAGE"
  62         android:maxSdkVersion="32" />
  63     <uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />                         
  64     <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />
  65     <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />

../../src/main/AndroidManifest.xml:64: Your app is currently not handling Selected Photos Access introduced in Android 14+

  61         android:name="android.permission.READ_EXTERNAL_STORAGE"
  62         android:maxSdkVersion="32" />
  63     <uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />
  64     <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />                          
  65     <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />
  66 
  67     <uses-permission android:name="android.permission.WAKE_LOCK" />

SelectedPhotoAccess Correctness Warning Priority 5/10

Restricted API

../../src/main/java/com/nextcloud/talk/bottomsheet/items/ListIconDialogAdapter.kt:69: MDUtil.inflate can only be called from within the same library group (referenced groupId=com.afollestad.material-dialogs from groupId=talk-android)

  66    }
  67 
  68    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ListItemViewHolder {
  69        val listItemView: View = parent.inflate(dialog.windowContext, R.layout.menu_item_sheet)     
  70        val viewHolder = ListItemViewHolder(
  71            itemView = listItemView,
  72            adapter = this

  66    }
  67 
  68    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ListItemViewHolder {
  69        val listItemView: View = parent.inflate(dialog.windowContext, R.layout.menu_item_sheet)     
  70        val viewHolder = ListItemViewHolder(
  71            itemView = listItemView,
  72            adapter = this

  66    }
  67 
  68    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ListItemViewHolder {
  69        val listItemView: View = parent.inflate(dialog.windowContext, R.layout.menu_item_sheet)     
  70        val viewHolder = ListItemViewHolder(
  71            itemView = listItemView,
  72            adapter = this

  66    }
  67 
  68    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ListItemViewHolder {
  69        val listItemView: View = parent.inflate(dialog.windowContext, R.layout.menu_item_sheet)     
  70        val viewHolder = ListItemViewHolder(
  71            itemView = listItemView,
  72            adapter = this

../../src/main/java/com/nextcloud/talk/bottomsheet/items/ListIconDialogAdapter.kt:74: MDUtil.maybeSetTextColor can only be called from within the same library group (referenced groupId=com.afollestad.material-dialogs from groupId=talk-android)

  71             itemView = listItemView,
  72             adapter = this
  73         )
  74         viewHolder.titleView.maybeSetTextColor(dialog.windowContext, R.attr.md_color_content)       
  75         return viewHolder
  76     }

  71             itemView = listItemView,
  72             adapter = this
  73         )
  74         viewHolder.titleView.maybeSetTextColor(dialog.windowContext, R.attr.md_color_content)       
  75         return viewHolder
  76     }

  71             itemView = listItemView,
  72             adapter = this
  73         )
  74         viewHolder.titleView.maybeSetTextColor(dialog.windowContext, R.attr.md_color_content)       
  75         return viewHolder
  76     }

  71             itemView = listItemView,
  72             adapter = this
  73         )
  74         viewHolder.titleView.maybeSetTextColor(dialog.windowContext, R.attr.md_color_content)       
  75         return viewHolder
  76     }

This API has been flagged with a restriction that has not been met.

Examples of API restrictions:
* Method can only be invoked by a subclass
* Method can only be accessed from within the same library (defined by the Gradle library group id)
* Method can only be accessed from tests.

You can add your own API restrictions with the @RestrictTo annotation.
To suppress this error, use the issue id "RestrictedApi" as explained in the Suppressing Warnings and Errors section.

RestrictedApi Correctness Error Priority 4/10

Unsafe opt-in usage intended to be error-level severity

../../src/main/java/com/nextcloud/talk/fullscreenfile/FullScreenMediaActivity.kt:196: This declaration is opt-in and its usage should be marked with @androidx.media3.common.util.UnstableApi or @OptIn(markerClass = androidx.media3.common.util.UnstableApi.class)

 193     private fun applyWindowInsets() {
 194         val playerView = binding.playerView
 195         val exoControls = playerView.findViewById<FrameLayout>(R.id.exo_bottom_bar)
 196         val exoProgress = playerView.findViewById<DefaultTimeBar>(R.id.exo_progress)                
 197         val progressBottomMargin = exoProgress.marginBottom
 198 
 199         ViewCompat.setOnApplyWindowInsetsListener(binding.root) { _, windowInsets ->

This API has been flagged as opt-in with error-level severity.

Any declaration annotated with this marker is considered part of an unstable or
otherwise non-standard API surface and its call sites should accept the opt-in
aspect of it by using the @OptIn annotation, using the marker annotation --
effectively causing further propagation of the opt-in aspect -- or configuring
the UnsafeOptInUsageError check's options for project-wide opt-in.

To configure project-wide opt-in, specify the opt-in option value in lint.xml
as a comma-delimited list of opted-in annotations:

<lint>
    <issue id="UnsafeOptInUsageError">
        <option name="opt-in" value="com.foo.ExperimentalBarAnnotation" />
    </issue>
</lint>

To suppress this error, use the issue id "UnsafeOptInUsageError" as explained in the Suppressing Warnings and Errors section.

Vendor: Android Open Source Project
Identifier: androidx.annotation.experimental
Feedback: https://issuetracker.google.com/issues/new?component=459778

UnsafeOptInUsageError Correctness Error Priority 4/10

Potential Plurals

../../src/main/res/values-b%2Ben%2B001/strings.xml:36: Formatting %d followed by words ("are"): This should probably be a plural rather than a string

  33   <string name="close_icon">Close Icon</string>
  34   <string name="connection_established">Connection established</string>
  35   <string name="connection_lost">Connection lost</string>
  36   <string name="connection_lost_queued">Connection lost - %1$d are queued</string>                
  37   <string name="connection_lost_sent_messages_are_queued">Connection lost - Sent messages are queued</string>
  38   <string name="continuous_voice_message_recording">Lock recording for continuously recording of the voice message</string>
  39   <string name="conversation_is_read_only">Conversation is read only</string>

This lint check looks for potential errors in internationalization where you have translated a message which involves a quantity and it looks like other parts of the string may need grammatical changes.

For example, rather than something like this:

  <string name="try_again">Try again in %d seconds.</string>

you should be using a plural:

   <plurals name="try_again">
        <item quantity="one">Try again in %d second</item>
        <item quantity="other">Try again in %d seconds</item>
    </plurals>

This will ensure that in other languages the right set of translations are provided for the different quantity classes.

(This check depends on some heuristics, so it may not accurately determine whether a string really should be a quantity. You can use tools:ignore to filter out false positives.

More info: https://developer.android.com/guide/topics/resources/string-resource.html#Plurals

To suppress this error, use the issue id "PluralsCandidate" as explained in the Suppressing Warnings and Errors section.

PluralsCandidate Messages Correctness Warning Priority 5/10

Formatting argument types incomplete or inconsistent

../../src/main/res/values-ug/strings.xml:513: Inconsistent number of arguments in formatting string nc_upload_notification_text; found both 3 here and 0 in values/strings.xml

 510     <string name="nc_upload_from_cloud">%1$s دىن ئورتاقلىشىش</string>
 511     <string name="nc_upload_from_device">ئۈسكۈنىدىن يۈكلەش</string>
 512     <string name="nc_upload_in_progess">يۈكلەش</string>
 513     <string name="nc_upload_notification_text">%1$s دىن%2$s  - %3$s  \ %%</string>                  
 514     <string name="nc_upload_picture_from_cam">رەسىمگە تارتىڭ</string>
 515     <string name="nc_upload_video_from_cam">سىن ئېلىڭ</string>
 516     <string name="nc_user">ئىشلەتكۈچى</string>

../../src/main/res/values/strings.xml:548

Conflicting number of arguments (0) here

 545     <string name="nc_upload_in_progess">Uploading</string>
 546     <string name="nc_upload_from_device">Upload from device</string>
 547 
 548     <string name="nc_upload_notification_text">%1$s to %2$s - %3$s\%%</string>                      
 549     <string name="nc_upload_failed_notification_title">Failure</string>
 550     <string name="nc_upload_failed_notification_text">Failed to upload %1$s</string>
 551     <string name="nc_file_storage_permission">Permission for file access is required</string>

StringFormatCount Messages Correctness Warning Priority 5/10

Allowing User Certificates

../../src/main/res/xml/network_security_config.xml:12: The Network Security Configuration allows the use of user certificates in the release version of your app

  9     <base-config cleartextTrafficPermitted="true">
 10         <trust-anchors>
 11             <certificates src="system"/>
 12             <certificates src="user"/>                                                              
 13         </trust-anchors>
 14     </base-config>
 15 </network-security-config>

Allowing user certificates could allow eavesdroppers to intercept data sent by your app, which could impact the privacy of your users. Consider nesting your app's trust-anchors inside a <debug-overrides> element to make sure they are only available when android:debuggable is set to true.

More info:

To suppress this error, use the issue id "AcceptsUserCertificates" as explained in the Suppressing Warnings and Errors section.

AcceptsUserCertificates Security Warning Priority 5/10

Implements custom TLS trust manager

../../src/main/java/com/nextcloud/talk/utils/ssl/TrustManager.java:34: Implementing a custom X509TrustManager is error-prone and likely to be insecure. It is likely to disable certificate validation altogether, and is non-trivial to implement correctly without calling Android's default implementation.

  31 import javax.net.ssl.X509TrustManager;
  32 
  33 
  34 public class TrustManager implements X509TrustManager {                                             
  35     private static final String TAG = "TrustManager";
  36 
  37     private File keystoreFile;

This check looks for custom X509TrustManager implementations.

More info: https://goo.gle/CustomX509TrustManager

To suppress this error, use the issue id "CustomX509TrustManager" as explained in the Suppressing Warnings and Errors section.

CustomX509TrustManager Security Warning Priority 5/10

Exported service does not require permission

../../src/main/AndroidManifest.xml:278: Exported service does not require permission

 275         <receiver android:name=".receivers.DismissRecordingAvailableReceiver" />
 276         <receiver android:name=".receivers.ShareRecordingToChatReceiver" />
 277 
 278         <service                                                                                    
 279             android:name=".utils.SyncService"
 280             android:exported="true">
 281             <intent-filter>

Exported services (services which either set exported=true or contain an intent-filter and do not specify exported=false) should define a permission that an entity must have in order to launch the service or bind to it. Without this, any application can use this service.

More info: https://goo.gle/ExportedService

Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.
To suppress this error, use the issue id "ExportedService" as explained in the Suppressing Warnings and Errors section.

ExportedService Security Warning Priority 5/10

Insecure Base Configuration

../../src/main/res/xml/network_security_config.xml:9: Insecure Base Configuration

  6   ~ SPDX-License-Identifier: GPL-3.0-or-later
  7 -->
  8 <network-security-config>
  9     <base-config cleartextTrafficPermitted="true">                                                  
 10         <trust-anchors>
 11             <certificates src="system"/>
 12             <certificates src="user"/>

Permitting cleartext traffic could allow eavesdroppers to intercept data sent by your app, which impacts the privacy of your users. Consider only allowing encrypted traffic by setting the cleartextTrafficPermitted tag to false.

More info:

Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.
To suppress this error, use the issue id "InsecureBaseConfiguration" as explained in the Suppressing Warnings and Errors section.

InsecureBaseConfiguration Security Warning Priority 5/10

Proceeds with the HTTPS connection despite SSL errors

../../src/main/java/com/nextcloud/talk/account/WebViewLoginActivity.kt:301: Permitting connections with SSL-related errors could allow eavesdroppers to intercept data sent by your app, which impacts the privacy of your users. Consider canceling the connections by invoking SslErrorHandler#cancel().

 298           } else {
 299               try {
 300                   trustManager.checkServerTrusted(arrayOf(cert), "generic")
 301                   handler.proceed()                                                       
 302               } catch (exception: CertificateException) {
 303                   eventBus.post(CertificateEvent(cert, trustManager, handler))
 304               }

 298           } else {
 299               try {
 300                   trustManager.checkServerTrusted(arrayOf(cert), "generic")
 301                   handler.proceed()                                                       
 302               } catch (exception: CertificateException) {
 303                   eventBus.post(CertificateEvent(cert, trustManager, handler))
 304               }

This check looks for onReceivedSslError implementations that invoke SslErrorHandler#proceed.

More info: https://goo.gle/WebViewClientOnReceivedSslError

To suppress this error, use the issue id "WebViewClientOnReceivedSslError" as explained in the Suppressing Warnings and Errors section.

WebViewClientOnReceivedSslError Security Warning Priority 5/10

Missing data extraction rules

../../src/main/AndroidManifest.xml:86: The attribute android:fullBackupContent is deprecated from Android 12 and higher and may be removed in future versions. Consider adding the attribute android:dataExtractionRules specifying an @xml resource which configures cloud backups and device transfers on Android 12 and higher.

  83     <application
  84         android:name=".application.NextcloudTalkApplication"
  85         android:allowBackup="true"
  86         android:fullBackupContent="@xml/backup_config"                                              
  87         android:icon="@mipmap/ic_launcher"
  88         android:label="@string/nc_app_name"
  89         android:largeHeap="true"

Before Android 12, the attributes android:allowBackup and android:fullBackupContent were used to configure all forms of backup, including cloud backups, device-to-device transfers and adb backup.

In Android 12 and higher, these attributes have been deprecated and will only apply to cloud backups. You should instead use the attribute android:dataExtractionRules, specifying an @xml resource that configures which files to back up, for cloud backups and for device-to-device transfers, separately. If your minSdkVersion supports older versions, you'll still want to specify an android:fullBackupContent resource if the default behavior is not right for your app.

More info:

Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.
To suppress this error, use the issue id "DataExtractionRules" as explained in the Suppressing Warnings and Errors section.

DataExtractionRules Security Warning Priority 3/10

Invalidating All RecyclerView Data

../../src/main/java/com/nextcloud/talk/chat/ChatActivity.kt:2573: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 2570                     }
 2571                 }
 2572                 adapter!!.delete(messagesToDelete)
 2573                 adapter!!.notifyDataSetChanged()                                                    
 2574             }
 2575         }

../../src/main/java/com/nextcloud/talk/chat/ChatActivity.kt:2593: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 2590                     updateReadStatusOfMessage(message, it)
 2591                 }
 2592             }
 2593             adapter!!.notifyDataSetChanged()                                                        
 2594         }
 2595     }

../../src/main/java/com/nextcloud/talk/contacts/ContactsActivity.kt:775: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 772                 }
 773             }
 774         }
 775         adapter?.notifyDataSetChanged()                                                             
 776         checkAndHandleDoneMenuItem()
 777     }

../../src/main/java/com/nextcloud/talk/contacts/ContactsActivity.kt:869: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 866         isPublicCall = !isPublicCall
 867         enableContactForNonPublicCall()
 868         checkAndHandleDoneMenuItem()
 869         adapter?.notifyDataSetChanged()                                                             
 870     }
 871 
 872     private fun enableContactForNonPublicCall() {

../../src/main/java/com/nextcloud/talk/bottomsheet/items/ListIconDialogAdapter.kt:108: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 105         if (listener != null) {
 106             this.selection = listener
 107         }
 108         this.notifyDataSetChanged()                                                                 
 109     }
 110 
 111     override fun disableItems(indices: IntArray) {

../../src/main/java/com/nextcloud/talk/bottomsheet/items/ListIconDialogAdapter.kt:113: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 110 
 111     override fun disableItems(indices: IntArray) {
 112         this.disabledIndices = indices
 113         notifyDataSetChanged()                                                                      
 114     }
 115 
 116     override fun checkItems(indices: IntArray) = Unit

../../src/main/java/com/nextcloud/talk/polls/adapters/PollCreateOptionsAdapter.kt:45: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 42 
 43     fun updateOptionsList(optionsList: ArrayList<PollCreateOptionItem>) {
 44         list = optionsList
 45         notifyDataSetChanged()                                                                      
 46     }
 47 }

../../src/main/java/com/nextcloud/talk/profile/ProfileActivity.kt:267: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 264 
 265   override fun onNext(userProfileFieldsOverall: UserProfileFieldsOverall) {
 266       editableFields = userProfileFieldsOverall.ocs!!.data!!
 267       adapter!!.notifyDataSetChanged()                                        
 268   }
 269 
 270   override fun onError(e: Throwable) {

../../src/main/java/com/nextcloud/talk/profile/ProfileActivity.kt:289: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 286                     binding.userinfoList.visibility = View.GONE
 287                 }
 288             }
 289             adapter!!.notifyDataSetChanged()                                                        
 290             return true
 291         }
 292         return super.onOptionsItemSelected(item)

../../src/main/java/com/nextcloud/talk/profile/ProfileActivity.kt:366: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 363      override fun onNext(userProfileFieldsOverall: UserProfileFieldsOverall) {
 364          editableFields = userProfileFieldsOverall.ocs!!.data!!
 365          invalidateOptionsMenu()
 366          adapter!!.notifyDataSetChanged()                                            
 367      }
 368 
 369      override fun onError(e: Throwable) {

../../src/main/java/com/nextcloud/talk/profile/ProfileActivity.kt:492: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 489           Snackbar.LENGTH_LONG
 490       ).show()
 491       adapter!!.updateFilteredList()
 492       adapter!!.notifyDataSetChanged()                                        
 493       Log.e(TAG, "Failed to saved: " + item.text + " as " + item.field, e)
 494   }

../../src/main/java/com/nextcloud/talk/profile/ProfileActivity.kt:641: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 638         fun setData(displayList: List<UserInfoDetailsItem>) {
 639             this.displayList = displayList
 640             updateFilteredList()
 641             notifyDataSetChanged()                                                                  
 642         }
 643 
 644         fun updateFilteredList() {

../../src/main/java/com/nextcloud/talk/profile/ProfileActivity.kt:761: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 758 
 759         fun updateScope(position: Int, scope: Scope?) {
 760             displayList!![position].scope = scope
 761             notifyDataSetChanged()                                                                  
 762         }
 763     }

../../src/main/java/com/nextcloud/talk/ui/dialog/ShowReactionsDialog.kt:133: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 130 
 131             updateParticipantsForEmoji(chatMessage, tagAll)
 132         }
 133         adapter?.notifyDataSetChanged()                                                             
 134     }
 135 
 136     private fun updateParticipantsForEmoji(chatMessage: ChatMessage, emoji: String?) {

../../src/main/java/com/nextcloud/talk/ui/dialog/ShowReactionsDialog.kt:170: It will always be more efficient to use more specific change events if you can. Rely on notifyDataSetChanged as a last resort.

 167              Collections.sort(reactionVoters, ReactionComparator(user.userId))
 168 
 169              adapter?.list?.addAll(reactionVoters)
 170              adapter?.notifyDataSetChanged()                                             
 171          } else {
 172              Log.e(TAG, "no voters for this reaction")
 173          }

The RecyclerView adapter's onNotifyDataSetChanged method does not specify what about the data set has changed, forcing any observers to assume that all existing items and structure may no longer be valid. `LayoutManager`s will be forced to fully rebind and relayout all visible views.
To suppress this error, use the issue id "NotifyDataSetChanged" as explained in the Suppressing Warnings and Errors section.

NotifyDataSetChanged Performance Warning Priority 8/10

Obsolete SDK_INT Version Check

../../src/main/res/mipmap-anydpi-v26: This folder configuration (v26) is unnecessary; minSdkVersion is 26. Merge all the resources in this folder into mipmap-anydpi.

This check flags version checks that are not necessary, because the minSdkVersion (or surrounding known API level) is already at least as high as the version checked for.

Similarly, it also looks for resources in -vNN folders, such as values-v14 where the version qualifier is less than or equal to the minSdkVersion, where the contents should be merged into the best folder.
Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.
To suppress this error, use the issue id "ObsoleteSdkInt" as explained in the Suppressing Warnings and Errors section.

ObsoleteSdkInt Performance Warning Priority 6/10

View Holder Candidates

../../src/main/java/com/nextcloud/talk/ui/dialog/DialogBanListFragment.kt:67: Unconditional layout inflation from view adapter: Should use View Holder pattern (use recycled view passed into this method as the second parameter) for smoother scrolling

  64        }
  65 
  66        override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
  67            val binding = BanItemListBinding.inflate(LayoutInflater.from(context))                  
  68            binding.banActorName.text = bans[position].bannedDisplayName
  69            val time = bans[position].bannedTime!!.toLong() * ONE_SEC
  70            binding.banTime.text = DateUtils.formatDateTime(

When implementing a view Adapter, you should avoid unconditionally inflating a new layout; if an available item is passed in for reuse, you should try to use that one instead. This helps make for example ListView scrolling much smoother.

More info: https://developer.android.com/guide/topics/ui/layout/recyclerview#ViewHolder

To suppress this error, use the issue id "ViewHolder" as explained in the Suppressing Warnings and Errors section.

ViewHolder Performance Warning Priority 5/10

Overdraw: Painting regions more than once

../../src/main/res/layout/activity_account_verification.xml:12: Possible overdraw: Root element paints background @color/bg_default with a theme that also paints a background (inferred theme is @style/AppTheme.Launcher)

  9     xmlns:tools="http://schemas.android.com/tools"
 10     android:layout_width="match_parent"
 11     android:layout_height="match_parent"
 12     android:background="@color/bg_default"                                                          
 13     android:keepScreenOn="true">
 14 
 15     <ProgressBar

Overdraw Performance Warning Priority 3/10

Unused resources

../../src/main/res/drawable/baseline_calendar_month_24.xml:7: The resource R.drawable.baseline_calendar_month_24 appears to be unused

  4   ~ SPDX-FileCopyrightText: 2018-2024 Google LLC
  5   ~ SPDX-License-Identifier: Apache-2.0
  6 -->
  7 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  8     android:width="24dp"
  9     android:height="24dp"
 10     android:tint="#000000"

../../src/main/res/drawable/baseline_notifications_24.xml:7: The resource R.drawable.baseline_notifications_24 appears to be unused

  4   ~ SPDX-FileCopyrightText: 2021-2024 Google LLC
  5   ~ SPDX-License-Identifier: Apache-2.0
  6 -->
  7 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  8     android:width="24dp"
  9     android:height="24dp"
 10     android:tint="?attr/colorControlNormal"

../../src/main/res/drawable/baseline_report_problem_24.xml:7: The resource R.drawable.baseline_report_problem_24 appears to be unused

  4   ~ SPDX-FileCopyrightText: 2021-2024 Google LLC
  5   ~ SPDX-License-Identifier: Apache-2.0
  6 -->
  7 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  8     android:width="24dp"
  9     android:height="24dp"
 10     android:tint="#000000"

../../src/main/res/drawable/baseline_tag_faces_24.xml:8: The resource R.drawable.baseline_tag_faces_24 appears to be unused

  5   ~ SPDX-License-Identifier: GPL-3.0-or-later
  6   -->
  7 
  8 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  9     android:height="24dp"
 10     android:tint="#000000"
 11     android:viewportHeight="24"

../../src/main/res/values/bool.xml:10: The resource R.bool.value_false appears to be unused

  7 -->
  8 <resources>
  9     <bool name="value_true">true</bool>
 10     <bool name="value_false">false</bool>                                                           
 11 </resources>

../../src/main/res/drawable/ic_baseline_mic_24.xml:7: The resource R.drawable.ic_baseline_mic_24 appears to be unused

  4   ~ SPDX-FileCopyrightText: 2021-2024 Google LLC
  5   ~ SPDX-License-Identifier: Apache-2.0
  6 -->
  7 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  8     android:width="24dp"
  9     android:height="24dp"
 10     android:tint="?attr/colorControlNormal"

../../src/main/res/drawable/ic_baseline_mic_red_24.xml:7: The resource R.drawable.ic_baseline_mic_red_24 appears to be unused

  4   ~ SPDX-FileCopyrightText: 2021-2024 Google LLC
  5   ~ SPDX-License-Identifier: Apache-2.0
  6 -->
  7 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  8     android:width="24dp"
  9     android:height="24dp"
 10     android:tint="@color/nc_darkRed"

../../src/main/res/drawable/ic_check_24.xml:7: The resource R.drawable.ic_check_24 appears to be unused

  4   ~ SPDX-FileCopyrightText: 2021-2024 Google LLC
  5   ~ SPDX-License-Identifier: Apache-2.0
  6 -->
  7 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  8     android:width="24dp"
  9     android:height="24dp"
 10     android:tint="?attr/colorControlNormal"

../../src/main/res/drawable/ic_circular_document.xml:8: The resource R.drawable.ic_circular_document appears to be unused

  5   ~ SPDX-FileCopyrightText: 2021-2024 Andy Scherzinger <info@andy-scherzinger.de>
  6   ~ SPDX-License-Identifier: Apache-2.0
  7 -->
  8 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  9 android:width="24dp"
 10 android:height="24dp"
 11 android:autoMirrored="true"

../../src/main/res/drawable/ic_circular_mail.xml:8: The resource R.drawable.ic_circular_mail appears to be unused

  5   ~ SPDX-FileCopyrightText: 2021-2024 Andy Scherzinger <info@andy-scherzinger.de>
  6   ~ SPDX-License-Identifier: Apache-2.0
  7 -->
  8 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  9     android:width="24dp"
 10     android:height="24dp"
 11     android:viewportWidth="24"

../../src/main/res/drawable/ic_link_grey600_24px.xml:7: The resource R.drawable.ic_link_grey600_24px appears to be unused

  4   ~ SPDX-FileCopyrightText: 2017-2019 Mario Danic <mario@lovelyhq.com>
  5   ~ SPDX-License-Identifier: GPL-3.0-or-later
  6 -->
  7 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  8     android:width="24dp"
  9     android:height="24dp"
 10     android:viewportWidth="960"

../../src/main/res/drawable/ic_lock_plus_grey600_24dp.xml:7: The resource R.drawable.ic_lock_plus_grey600_24dp appears to be unused

  4   ~ SPDX-FileCopyrightText: 2018-2024 Google LLC
  5   ~ SPDX-License-Identifier: Apache-2.0
  6 -->
  7 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  8     android:width="24dp"
  9     android:height="24dp"
 10     android:viewportWidth="24"

../../src/main/res/drawable/ic_mimetype_folder_shared.xml:7: The resource R.drawable.ic_mimetype_folder_shared appears to be unused

  4   ~ SPDX-FileCopyrightText: 2018-2024 Google LLC
  5   ~ SPDX-License-Identifier: Apache-2.0
  6 -->
  7 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  8     android:width="16dp"
  9     android:height="16dp"
 10     android:viewportWidth="16"

../../src/main/res/drawable/ic_mimetype_text_calendar.xml:8: The resource R.drawable.ic_mimetype_text_calendar appears to be unused

  5   ~ SPDX-FileCopyrightText: 2018-2024 Google LLC
  6   ~ SPDX-License-Identifier: Apache-2.0
  7 -->
  8 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  9     android:width="24dp"
 10     android:height="24dp"
 11     android:tint="#969696"

../../src/main/res/drawable/ic_more_horiz_black_24dp.xml:7: The resource R.drawable.ic_more_horiz_black_24dp appears to be unused

  4   ~ SPDX-FileCopyrightText: 2018-2024 Google LLC
  5   ~ SPDX-License-Identifier: Apache-2.0
  6 -->
  7 <vector xmlns:android="http://schemas.android.com/apk/res/android"                                  
  8     android:width="24dp"
  9     android:height="24dp"
 10     android:autoMirrored="true"

../../src/main/res/drawable/incoming_gradient.xml:8: The resource R.drawable.incoming_gradient appears to be unused

  5   ~ SPDX-FileCopyrightText: 2017-2018 Mario Danic <mario@lovelyhq.com>
  6   ~ SPDX-License-Identifier: GPL-3.0-or-later
  7 -->
  8 <shape xmlns:android="http://schemas.android.com/apk/res/android"                                   
  9     android:shape="rectangle">
 10     <gradient
 11         android:angle="-90"

../../src/main/res/layout/library_fast_scroller_layout.xml:8: The resource R.layout.library_fast_scroller_layout appears to be unused

  5   ~ SPDX-FileCopyrightText: 2017-2019 Mario Danic <mario@lovelyhq.com>
  6   ~ SPDX-License-Identifier: GPL-3.0-or-later
  7 -->
  8 <merge xmlns:android="http://schemas.android.com/apk/res/android"                                   
  9     xmlns:tools="http://schemas.android.com/tools"
 10     android:layout_width="wrap_content"
 11     android:layout_height="match_parent">

../../src/main/res/raw/librem_by_feandesign_call.ogg: The resource R.raw.librem_by_feandesign_call appears to be unused
../../src/main/res/raw/librem_by_feandesign_message.ogg: The resource R.raw.librem_by_feandesign_message appears to be unused
../../src/main/res/raw/next_voice_message_doodle.ogg: The resource R.raw.next_voice_message_doodle appears to be unused
../../src/main/res/drawable/online_status_with_border.xml:8: The resource R.drawable.online_status_with_border appears to be unused

  5   ~ SPDX-FileCopyrightText: 2019-2024 Nextcloud GmbH and Nextcloud contributors
  6   ~ SPDX-License-Identifier: GPL-3.0-or-later
  7 -->
  8 <shape xmlns:android="http://schemas.android.com/apk/res/android"                                   
  9     android:shape="oval">
 10     <solid android:color="#00ff00" />

../../src/main/res/layout/progress_layout.xml:8: The resource R.layout.progress_layout appears to be unused

  5   ~ SPDX-FileCopyrightText: 2017-2019 Mario Danic <mario@lovelyhq.com>
  6   ~ SPDX-License-Identifier: GPL-3.0-or-later
  7 -->
  8 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"                          
  9     android:layout_width="match_parent" android:layout_height="match_parent">
 10 
 11     <ProgressBar

../../src/main/res/drawable/round_corner.xml:8: The resource R.drawable.round_corner appears to be unused

  5   ~ SPDX-FileCopyrightText: Tobias Kaminsky <tobias@kaminsky.me>
  6   ~ SPDX-License-Identifier: GPL-3.0-or-later
  7 -->
  8 <shape xmlns:android="http://schemas.android.com/apk/res/android">                                  
  9     <solid android:color="#ededed" />
 10     <corners android:radius="24dp" />
 11 </shape>

../../src/main/res/layout/search_layout.xml:9: The resource R.layout.search_layout appears to be unused

  6   ~ SPDX-FileCopyrightText: 2017-2020 Mario Danic <mario@lovelyhq.com>
  7   ~ SPDX-License-Identifier: GPL-3.0-or-later
  8 -->
  9 <merge xmlns:android="http://schemas.android.com/apk/res/android"                                   
 10     xmlns:app="http://schemas.android.com/apk/res-auto"
 11     xmlns:tools="http://schemas.android.com/tools"
 12     android:layout_width="match_parent"

../../src/main/res/values/setup.xml:46: The resource R.string.project_id appears to be unused

 43   <string name="gcm_defaultSenderId" translatable="false">829118773643</string>
 44   <string name="google_api_key" translatable="false">AIzaSyAWIyOcLafaFp8PFL61h64cy1NNZW2cU_s</string>
 45   <string name="google_app_id" translatable="false">1:829118773643:android:54b65087c544d819</string>
 46   <string name="project_id" translatable="false">nextcloud-a7dea</string>                         
 47   <string name="google_crash_reporting_api_key" translatable="false">AIzaSyAWIyOcLafaFp8PFL61h64cy1NNZW2cU_s</string>
 48   <string name="google_storage_bucket" translatable="false">nextcloud-a7dea.appspot.com</string>

../../src/main/res/values/strings.xml:78: The resource R.string.nc_settings_proxy_type_key appears to be unused

  75 
  76     <!-- Settings -->
  77     <string name="nc_settings_advanced_title">Advanced</string>
  78     <string name="nc_settings_proxy_type_key" translatable="false">proxy_type</string>              
  79     <string name="nc_settings_proxy_type_title">Proxy type</string>
  80     <string name="nc_settings_proxy_host_key" translatable="false">proxy_host</string>
  81     <string name="nc_settings_proxy_host_title">Proxy host</string>

../../src/main/res/values/strings.xml:80: The resource R.string.nc_settings_proxy_host_key appears to be unused

  77     <string name="nc_settings_advanced_title">Advanced</string>
  78     <string name="nc_settings_proxy_type_key" translatable="false">proxy_type</string>
  79     <string name="nc_settings_proxy_type_title">Proxy type</string>
  80     <string name="nc_settings_proxy_host_key" translatable="false">proxy_host</string>              
  81     <string name="nc_settings_proxy_host_title">Proxy host</string>
  82     <string name="nc_settings_proxy_port_key" translatable="false">proxy_port</string>
  83     <string name="nc_settings_proxy_port_title">Proxy port</string>

../../src/main/res/values/strings.xml:82: The resource R.string.nc_settings_proxy_port_key appears to be unused

  79     <string name="nc_settings_proxy_type_title">Proxy type</string>
  80     <string name="nc_settings_proxy_host_key" translatable="false">proxy_host</string>
  81     <string name="nc_settings_proxy_host_title">Proxy host</string>
  82     <string name="nc_settings_proxy_port_key" translatable="false">proxy_port</string>              
  83     <string name="nc_settings_proxy_port_title">Proxy port</string>
  84     <string name="nc_settings_proxy_username_title">Proxy username</string>
  85     <string name="nc_settings_proxy_username_key" translatable="false">proxy_username</string>

../../src/main/res/values/strings.xml:85: The resource R.string.nc_settings_proxy_username_key appears to be unused

  82     <string name="nc_settings_proxy_port_key" translatable="false">proxy_port</string>
  83     <string name="nc_settings_proxy_port_title">Proxy port</string>
  84     <string name="nc_settings_proxy_username_title">Proxy username</string>
  85     <string name="nc_settings_proxy_username_key" translatable="false">proxy_username</string>      
  86     <string name="nc_settings_proxy_password_title">Proxy password</string>
  87     <string name="nc_settings_proxy_password_key" translatable="false">proxy_password</string>
  88     <string name="nc_settings_use_credentials_title">Proxy requires credentials</string>

../../src/main/res/values/strings.xml:87: The resource R.string.nc_settings_proxy_password_key appears to be unused

  84   <string name="nc_settings_proxy_username_title">Proxy username</string>
  85   <string name="nc_settings_proxy_username_key" translatable="false">proxy_username</string>
  86   <string name="nc_settings_proxy_password_title">Proxy password</string>
  87   <string name="nc_settings_proxy_password_key" translatable="false">proxy_password</string>      
  88   <string name="nc_settings_use_credentials_title">Proxy requires credentials</string>
  89   <string name="nc_settings_use_credentials_key" translatable="false">proxy_credentials</string>
  90   <string name="nc_settings_reauthorize">Reauthorize account</string>

../../src/main/res/values/strings.xml:89: The resource R.string.nc_settings_use_credentials_key appears to be unused

  86   <string name="nc_settings_proxy_password_title">Proxy password</string>
  87   <string name="nc_settings_proxy_password_key" translatable="false">proxy_password</string>
  88   <string name="nc_settings_use_credentials_title">Proxy requires credentials</string>
  89   <string name="nc_settings_use_credentials_key" translatable="false">proxy_credentials</string>  
  90   <string name="nc_settings_reauthorize">Reauthorize account</string>
  91   <string name="nc_client_cert_setup">Set up client certificate</string>
  92   <string name="nc_client_cert_change">Change client certificate</string>

../../src/main/res/values/strings.xml:103: The resource R.string.nc_account_scheduled_for_deletion appears to be unused

 100   <string name="nc_settings_wrong_account">Only current account can be reauthorized</string>
 101   <string name="nc_settings_no_talk_installed">Talk app is not installed on the server you tried to authenticate against</string>
 102   <string name="nc_settings_account_updated">Your already existing account was updated, instead of adding a new one</string>
 103   <string name="nc_account_scheduled_for_deletion">The account is scheduled for deletion, and cannot be changed</string>
 104   <string name="nc_settings_notification_sounds_post_oreo">Notifications</string>
 105   <string name="nc_settings_call_ringtone">Calls</string>
 106   <string name="nc_settings_call_ringtone_key" translatable="false">call_ringtone</string>

../../src/main/res/values/strings.xml:106: The resource R.string.nc_settings_call_ringtone_key appears to be unused

 103   <string name="nc_account_scheduled_for_deletion">The account is scheduled for deletion, and cannot be changed</string>
 104   <string name="nc_settings_notification_sounds_post_oreo">Notifications</string>
 105   <string name="nc_settings_call_ringtone">Calls</string>
 106   <string name="nc_settings_call_ringtone_key" translatable="false">call_ringtone</string>        
 107   <string name="nc_settings_other_notifications_ringtone">Messages</string>
 108   <string name="nc_settings_message_ringtone_key" translatable="false">message_ringtone</string>
 109   <string name="nc_settings_default_ringtone" translatable="false">Librem by feandesign</string>

../../src/main/res/values/strings.xml:108: The resource R.string.nc_settings_message_ringtone_key appears to be unused

 105   <string name="nc_settings_call_ringtone">Calls</string>
 106   <string name="nc_settings_call_ringtone_key" translatable="false">call_ringtone</string>
 107   <string name="nc_settings_other_notifications_ringtone">Messages</string>
 108   <string name="nc_settings_message_ringtone_key" translatable="false">message_ringtone</string>  
 109   <string name="nc_settings_default_ringtone" translatable="false">Librem by feandesign</string>
 110   <string name="nc_settings_no_ringtone">No sound</string>
 111   <string name="nc_settings_server_notification_app_not_installed_title">Server notifications app not installed</string>

../../src/main/res/values/strings.xml:127: The resource R.string.nc_settings_screen_lock_key appears to be unused

 124   <string name="nc_settings_privacy">Privacy</string>
 125   <string name="nc_settings_screen_lock_title">Screen lock</string>
 126   <string name="nc_settings_screen_lock_desc">Lock %1$s with Android screen lock or supported biometric method</string>
 127   <string name="nc_settings_screen_lock_key" translatable="false">screen_lock</string>            
 128   <string name="nc_settings_screen_lock_timeout_title">Screen lock inactivity timeout</string>
 129   <string name="nc_settings_screen_lock_timeout_key" translatable="false">screen_lock_timeout</string>
 130   <string name="nc_settings_screen_security_title">Screen security</string>

../../src/main/res/values/strings.xml:129: The resource R.string.nc_settings_screen_lock_timeout_key appears to be unused

 126   <string name="nc_settings_screen_lock_desc">Lock %1$s with Android screen lock or supported biometric method</string>
 127   <string name="nc_settings_screen_lock_key" translatable="false">screen_lock</string>
 128   <string name="nc_settings_screen_lock_timeout_title">Screen lock inactivity timeout</string>
 129   <string name="nc_settings_screen_lock_timeout_key" translatable="false">screen_lock_timeout</string>
 130   <string name="nc_settings_screen_security_title">Screen security</string>
 131   <string name="nc_settings_screen_security_desc">Prevents screenshots in the recent list and inside the app</string>
 132   <string name="nc_settings_screen_security_key" translatable="false">screen_security</string>

../../src/main/res/values/strings.xml:132: The resource R.string.nc_settings_screen_security_key appears to be unused

 129   <string name="nc_settings_screen_lock_timeout_key" translatable="false">screen_lock_timeout</string>
 130   <string name="nc_settings_screen_security_title">Screen security</string>
 131   <string name="nc_settings_screen_security_desc">Prevents screenshots in the recent list and inside the app</string>
 132   <string name="nc_settings_screen_security_key" translatable="false">screen_security</string>    
 133   <string name="nc_settings_incognito_keyboard_title">Incognito keyboard</string>
 134   <string name="nc_settings_incognito_keyboard_desc">Instructs keyboard to disable personalized learning (without guarantees)</string>
 135   <string name="nc_settings_read_privacy_key" translatable="false">read_privacy</string>

../../src/main/res/values/strings.xml:159: The resource R.string.nc_privacy appears to be unused

 156 
 157     <string name="nc_no_proxy">No proxy</string>
 158     <string name="nc_about">About</string>
 159     <string name="nc_privacy">Privacy</string>                                                      
 160     <string name="nc_get_source_code">Get source code</string>
 161     <string name="nc_license_title">License</string>
 162     <string name="nc_license_summary">GNU General Public License, Version 3</string>

../../src/main/res/values/strings.xml:175: The resource R.string.nc_settings_notifications_declined_hint appears to be unused

 172 
 173   <string name="nc_settings_notifications_granted">Notifications are granted</string>
 174   <string name="nc_settings_notifications_declined">Notifications are declined</string>
 175   <string name="nc_settings_notifications_declined_hint">Notifications are declined. Please allow notifications in Android settings</string>
 176 
 177   <!-- Diagnose -->
 178   <string name="nc_notifications_troubleshooting_dialog_title">Notification troubleshooting</string>

../../src/main/res/values/strings.xml:373: The resource R.string.divider appears to be unused

 370     <string name="dnd">Do not disturb</string>
 371     <string name="away">Away</string>
 372     <string name="invisible">Invisible</string>
 373     <string name="divider" translatable="false">—</string>                                          
 374     <string name="default_emoji" translatable="false">😃</string>
 375     <string name="emoji_thumbsUp" translatable="false">👍</string>
 376     <string name="emoji_thumbsDown" translatable="false">👎</string>

../../src/main/res/values/strings.xml:398: The resource R.string.nc_refresh appears to be unused

 395     <string name="error_loading_chats">There was a problem loading your chats</string>
 396     <string name="close">Close</string>
 397     <string name="close_icon">Close Icon</string>
 398     <string name="nc_refresh">Refresh</string>                                                      
 399     <string name="nc_check_your_internet">Please check your internet connection</string>
 400     <string name="nc_visible">Visible</string>

../../src/main/res/values/strings.xml:399: The resource R.string.nc_check_your_internet appears to be unused

 396     <string name="close">Close</string>
 397     <string name="close_icon">Close Icon</string>
 398     <string name="nc_refresh">Refresh</string>
 399     <string name="nc_check_your_internet">Please check your internet connection</string>            
 400     <string name="nc_visible">Visible</string>
 401 
 402     <!-- Chat -->

../../src/main/res/values/strings.xml:400: The resource R.string.nc_visible appears to be unused

 397     <string name="close_icon">Close Icon</string>
 398     <string name="nc_refresh">Refresh</string>
 399     <string name="nc_check_your_internet">Please check your internet connection</string>
 400     <string name="nc_visible">Visible</string>                                                      
 401 
 402     <!-- Chat -->
 403     <string name="nc_hint_enter_a_message">Enter a message …</string>

../../src/main/res/values/strings.xml:439: The resource R.string.nc_add_attachment appears to be unused

 436     <string name="nc_message_sending">Sending</string>
 437     <string name="nc_message_failed_to_send">Failed to send message:</string>
 438     <string name="nc_remote_audio_off">Remote audio off</string>
 439     <string name="nc_add_attachment">Add attachment</string>                                        
 440     <string name="emoji_category_recent">Recent</string>
 441     <plurals name="see_similar_system_messages">
 442         <item quantity="one">See %d similar message</item>

../../src/main/res/values/strings.xml:440: The resource R.string.emoji_category_recent appears to be unused

 437     <string name="nc_message_failed_to_send">Failed to send message:</string>
 438     <string name="nc_remote_audio_off">Remote audio off</string>
 439     <string name="nc_add_attachment">Add attachment</string>
 440     <string name="emoji_category_recent">Recent</string>                                            
 441     <plurals name="see_similar_system_messages">
 442         <item quantity="one">See %d similar message</item>
 443         <item quantity="other">See %d similar messages</item>

../../src/main/res/values/strings.xml:461: The resource R.string.nc_guest_access_password_weak_alert_title appears to be unused

 458   <string name="nc_guest_access_password_dialog_title">Guest access password</string>
 459   <string name="nc_guest_access_password_dialog_hint">Enter a password</string>
 460   <string name="nc_guest_access_password_failed">Error during setting/disabling the password.</string>
 461   <string name="nc_guest_access_password_weak_alert_title">Weak password</string>                 
 462   <string name="nc_guest_access_share_link">Share conversation link</string>
 463   <string name="nc_guest_access_resend_invitations">Resend invitations</string>
 464   <string name="nc_guest_access_resend_invitations_successful">Invitations were sent out again.</string>

../../src/main/res/values/strings.xml:477: The resource R.string.nc_email appears to be unused

 474 
 475     <!-- Other -->
 476     <string name="nc_limit_hit">%s characters limit has been hit</string>
 477     <string name="nc_email">Email</string>                                                          
 478     <string name="nc_group">Group</string>
 479     <string name="nc_team">Team</string>
 480     <string name="nc_groups">Groups</string>

../../src/main/res/values/strings.xml:485: The resource R.string.nc_owner appears to be unused

 482     <string name="nc_participants">Participants</string>
 483     <string name="nc_participants_add">Add participants</string>
 484 
 485     <string name="nc_owner">Owner</string>                                                          
 486     <string name="nc_moderator">Moderator</string>
 487     <string name="nc_user">User</string>
 488     <string name="nc_guest">Guest</string>

../../src/main/res/values/strings.xml:575: The resource R.string.nc_description_record_voice appears to be unused

 572   <!-- voice messages -->
 573   <string name="nc_voice_message_filename">Talk recording from %1$s (%2$s)</string>
 574   <string name="nc_voice_message_hold_to_record_info">Hold to record, release to send.</string>
 575   <string name="nc_description_record_voice">Record voice message</string>                        
 576   <string name="nc_voice_message_slide_to_cancel">« Slide to cancel</string>
 577   <string name="play_pause_voice_message">Play/pause voice message</string>
 578   <string name="nc_voice_message_missing_audio_permission">Permission for audio recording is required</string>

../../src/main/res/values/strings.xml:576: The resource R.string.nc_voice_message_slide_to_cancel appears to be unused

 573   <string name="nc_voice_message_filename">Talk recording from %1$s (%2$s)</string>
 574   <string name="nc_voice_message_hold_to_record_info">Hold to record, release to send.</string>
 575   <string name="nc_description_record_voice">Record voice message</string>
 576   <string name="nc_voice_message_slide_to_cancel">« Slide to cancel</string>                      
 577   <string name="play_pause_voice_message">Play/pause voice message</string>
 578   <string name="nc_voice_message_missing_audio_permission">Permission for audio recording is required</string>
 579   <string name="playback_speed_control">Playback speed control</string>

NOTE: 12 results omitted.

UnusedResources Performance Warning Priority 3/10

Unnecessary parent layout

../../src/main/res/layout/call_activity.xml:27: This RelativeLayout layout or its LinearLayout parent is possibly unnecessary; transfer the background attribute to the other view

  24         android:layout_height="match_parent"
  25         android:orientation="vertical">
  26 
  27         <RelativeLayout                                                                             
  28             android:id="@+id/conversationRelativeLayout"
  29             android:layout_width="match_parent"
  30             android:layout_height="0dp"

UselessParent Performance Warning Priority 2/10

Layout has too many views

../../src/main/res/layout/activity_settings.xml:614: activity_settings.xml has more than 80 views, bad for performance

 611                    android:layout_height="wrap_content"
 612                    android:text="@string/nc_settings_typing_status_desc"/>
 613 
 614                <com.google.android.material.textview.MaterialTextView                      
 615                    android:id="@+id/settings_typing_status_only_with_hpb"
 616                    android:layout_width="wrap_content"
 617                    android:layout_height="wrap_content"

Using too many views in a single layout is bad for performance. Consider using compound drawables or other tricks for reducing the number of views in this layout.

The maximum view count defaults to 80 but can be configured with the environment variable ANDROID_LINT_MAX_VIEW_COUNT.
To suppress this error, use the issue id "TooManyViews" as explained in the Suppressing Warnings and Errors section.

TooManyViews Performance Warning Priority 1/10

TextView Internationalization

../../src/main/java/com/nextcloud/talk/adapters/items/ConversationItem.kt:283: Number formatting does not take into account locale settings. Consider using String.format instead.

 280   holder.binding.dialogLastMessage.setTypeface(holder.binding.dialogLastMessage.typeface, Typeface.BOLD)
 281   holder.binding.dialogUnreadBubble.visibility = View.VISIBLE
 282   if (model.unreadMessages < UNREAD_MESSAGES_TRESHOLD) {
 283       holder.binding.dialogUnreadBubble.text = model.unreadMessages.toLong().toString()       
 284   } else {
 285       holder.binding.dialogUnreadBubble.setText(R.string.tooManyUnreadMessages)
 286   }

../../src/main/java/com/nextcloud/talk/adapters/messages/Reaction.kt:139: Number formatting does not take into account locale settings. Consider using String.format instead.

 136     ): TextView {
 137         val reactionAmount = TextView(context)
 138         reactionAmount.setTextColor(textColor)
 139         reactionAmount.text = amount.toString()                                                     
 140         reactionAmount.layoutParams = amountParams
 141         return reactionAmount
 142     }

../../src/main/java/com/nextcloud/talk/ui/dialog/ShowReactionsDialog.kt:96: Number formatting does not take into account locale settings. Consider using String.format instead.

  93                 val itemBinding = ItemReactionsTabBinding.inflate(layoutInflater)
  94                 itemBinding.reactionTab.tag = emoji
  95                 itemBinding.reactionIcon.text = emoji
  96                 itemBinding.reactionCount.text = amount.toString()                                  
  97                 tab.customView = itemBinding.root
  98 
  99                 binding.emojiReactionsTabs.addTab(tab)

../../src/main/java/com/nextcloud/talk/ui/dialog/ShowReactionsDialog.kt:107: Number formatting does not take into account locale settings. Consider using String.format instead.

 104          val itemBinding = ItemReactionsTabBinding.inflate(layoutInflater)
 105          itemBinding.reactionTab.tag = tagAll
 106          itemBinding.reactionIcon.text = context.getString(R.string.reactions_tab_all)
 107          itemBinding.reactionCount.text = reactionsTotal.toString()                              
 108          tab.customView = itemBinding.root
 109 
 110          binding.emojiReactionsTabs.addTab(tab, 0)

When calling TextView#setText
* Never call Number#toString() to format numbers; it will not handle fraction separators and locale-specific digits properly. Consider using String#format with proper format specifications (%d or %f) instead.
* Do not pass a string literal (e.g. "Hello") to display text. Hardcoded text can not be properly translated to other languages. Consider using Android resource strings instead.
* Do not build messages by concatenating text chunks. Such messages can not be properly translated.

More info: https://developer.android.com/guide/topics/resources/localization.html

To suppress this error, use the issue id "SetTextI18n" as explained in the Suppressing Warnings and Errors section.

SetTextI18n Internationalization Warning Priority 6/10

Included Additional Checks

This card lists all the extra checks run by lint, provided from libraries, build configuration and extra flags. This is included to help you verify whether a particular check is included in analysis when configuring builds. (Note that the list does not include the hundreds of built-in checks into lint, only additional ones.)

ArcAnimationSpecTypeIssue

ArcAnimationSpec is designed for 2D values. Particularly, for positional values such as Offset.
Trying to use it for values of different dimensions (Float, Size, Color, etc.) will result in unpredictable animation behavior.

Vendor: Jetpack Compose
Identifier: androidx.compose.animation.core
Feedback: https://issuetracker.google.com/issues/new?component=612128

AutoboxingStateCreation

Calling mutableStateOf<T>() when T is either backed by a primitive type on the JVM or is a value class results in a state implementation that requires all state values to be boxed. This usually causes an additional allocation for each state write, and adds some additional work to auto-unbox values when reading the value of the state. Instead, prefer to use a specialized primitive state implementation for Int, Long, Float, and Double when the state does not need to track null values and does not override the default SnapshotMutationPolicy. See mutableIntStateOf(), mutableLongStateOf(), mutableFloatStateOf(), and mutableDoubleStateOf() for more information.

Vendor: Jetpack Compose
Identifier: androidx.compose.runtime
Feedback: https://issuetracker.google.com/issues/new?component=612128

AutoboxingStateValueProperty

Avoid using the generic value property when using a specialized State type. Reading or writing to the state's generic value property will result in an unnecessary autoboxing operation. Prefer the specialized value property (e.g. intValue for MutableIntState), or use property delegation to avoid unnecessary allocations.

Vendor: Jetpack Compose
Identifier: androidx.compose.runtime
Feedback: https://issuetracker.google.com/issues/new?component=612128

BadConfigurationProvider

An android.app.Application must implement androidx.work.Configuration.Provider
for on-demand initialization.

Vendor: Android Open Source Project
Identifier: androidx.work
Feedback: https://issuetracker.google.com/issues/new?component=409906

BadPeriodicWorkRequestEnqueue

When using enqueue() for `PeriodicWorkRequest`s, you might end up enqueuing
duplicate requests unintentionally. You should be using
enqueueUniquePeriodicWork with an ExistingPeriodicWorkPolicy.KEEP instead.

Vendor: Android Open Source Project
Identifier: androidx.work
Feedback: https://issuetracker.google.com/issues/new?component=409906

ComposableNaming

@Composable functions without a return type should use similar naming to classes, starting with an uppercase letter and ending with a noun. @Composable functions with a return type should be treated as normal Kotlin functions, starting with a lowercase letter.

Vendor: Jetpack Compose
Identifier: androidx.compose.runtime
Feedback: https://issuetracker.google.com/issues/new?component=612128

CompositionLocalNaming

CompositionLocal properties should be prefixed with Local. This helps make it clear at their use site that these values are local to the current composition. Typically the full name will be Local + the type of the CompositionLocal, for example val LocalFoo = compositionLocalOf { Foo() }.

Vendor: Jetpack Compose
Identifier: androidx.compose.runtime
Feedback: https://issuetracker.google.com/issues/new?component=612128

ConflictingOnColor

In the Material color system background colors have a corresponding 'on' color which is used for the content color inside a component. For example, a button colored primary will have onPrimary text. Because of this, it is important that there is only one possible onColor for a given color value, otherwise there is no way to know which 'on' color should be used inside a component. To fix this either use the same 'on' color for identical background colors, or use a different background color for each 'on' color.

Vendor: Jetpack Compose
Identifier: androidx.compose.material
Feedback: https://issuetracker.google.com/issues/new?component=612128

CoroutineCreationDuringComposition

Creating a coroutine with async or launch during composition is often incorrect - this means that a coroutine will be created even if the composition fails / is rolled back, and it also means that multiple coroutines could end up mutating the same state, causing inconsistent results. Instead, use LaunchedEffect and create coroutines inside the suspending block. The block will only run after a successful composition, and will cancel existing coroutines when key changes, allowing correct cleanup.

Vendor: Jetpack Compose
Identifier: androidx.compose.runtime
Feedback: https://issuetracker.google.com/issues/new?component=612128

DetachAndAttachSameFragment

When doing a FragmentTransaction that includes both attach() and detach() operations being committed on the same fragment instance, it is a no-op. The reason for this is that the FragmentManager optimizes all operations within a single transaction so the attach() and detach() cancel each other out and neither is actually executed. To get the desired behavior, you should separate the attach() and detach() calls into separate FragmentTransactions.

Vendor: Android Open Source Project
Identifier: androidx.fragment
Feedback: https://issuetracker.google.com/issues/new?component=460964

DialogFragmentCallbacksDetector

When using a DialogFragment, the setOnCancelListener and setOnDismissListener callback functions within the onCreateDialog function __must not be used__ because the DialogFragment owns these callbacks. Instead the respective onCancel and onDismiss functions can be used to achieve the desired effect.

Vendor: Android Open Source Project
Identifier: androidx.fragment
Feedback: https://issuetracker.google.com/issues/new?component=460964

EnsureInitializerMetadata

When a library defines a Initializer, it needs to be accompanied by a corresponding <meta-data> entry in the AndroidManifest.xml file.

Vendor: Android Open Source Project
Identifier: androidx.startup
Feedback: https://issuetracker.google.com/issues/new?component=823348

EnsureInitializerNoArgConstr

Every Initializer must have a no argument constructor.

Vendor: Android Open Source Project
Identifier: androidx.startup
Feedback: https://issuetracker.google.com/issues/new?component=823348

ExperimentalAnnotationRetention

Experimental annotations defined in Java source should use default (CLASS) retention, while Kotlin-sourced annotations should use BINARY retention.

Vendor: Android Open Source Project
Identifier: androidx.annotation.experimental
Feedback: https://issuetracker.google.com/issues/new?component=459778

FlowOperatorInvokedInComposition

Calling a Flow operator function within composition will result in a new Flow being created every recomposition, which will reset collectAsState() and cause other related problems. Instead Flow operators should be called inside remember, or a side effect such as LaunchedEffect.

Vendor: Jetpack Compose
Identifier: androidx.compose.runtime
Feedback: https://issuetracker.google.com/issues/new?component=612128

FragmentAddMenuProvider

The Fragment lifecycle can result in a Fragment being active longer than its view. This can lead to unexpected behavior from lifecycle aware objects remaining active longer than the Fragment's view. To solve this issue, getViewLifecycleOwner() should be used as a LifecycleOwner rather than the Fragment instance once it is safe to access the view lifecycle in a Fragment's onCreateView, onViewCreated, onActivityCreated, or onViewStateRestored methods.

Vendor: Android Open Source Project
Identifier: androidx.fragment
Feedback: https://issuetracker.google.com/issues/new?component=460964

FragmentBackPressedCallback

Vendor: Android Open Source Project
Identifier: androidx.fragment
Feedback: https://issuetracker.google.com/issues/new?component=460964

FragmentLiveDataObserve

When observing a LiveData object from a fragment's onCreateView, onViewCreated, onActivityCreated, or onViewStateRestored method getViewLifecycleOwner() should be used as the LifecycleOwner rather than the Fragment instance. The Fragment lifecycle can result in the Fragment being active longer than its view. This can lead to unexpected behavior from LiveData objects being observed longer than the Fragment's view is active.

Vendor: Android Open Source Project
Identifier: androidx.fragment
Feedback: https://issuetracker.google.com/issues/new?component=460964

FragmentTagUsage

FragmentContainerView replaces the <fragment> tag as the preferred way of adding fragments via XML. Unlike the <fragment> tag, FragmentContainerView uses a normal FragmentTransaction under the hood to add the initial fragment, allowing further FragmentTransaction operations on the FragmentContainerView and providing a consistent timing for lifecycle events.

More info: https://developer.android.com/reference/androidx/fragment/app/FragmentContainerView.html

Vendor: Android Open Source Project
Identifier: androidx.fragment
Feedback: https://issuetracker.google.com/issues/new?component=460964

FrequentlyChangedStateReadInComposition

This property is observable and is updated after every scroll or remeasure. If you use it in the composable function directly, it will be recomposed on every change, causing potential performance issues including infinity recomposition loops. Prefer wrapping it with derivedStateOf to use calculation based on this property in composition or collect changes inside LaunchedEffect instead.

Vendor: Jetpack Compose
Identifier: androidx.compose.foundation
Feedback: https://issuetracker.google.com/issues/new?component=612128

IdleBatteryChargingConstraints

Some devices are never considered charging and idle at the same time.
Consider removing one of these constraints.

Vendor: Android Open Source Project
Identifier: androidx.work
Feedback: https://issuetracker.google.com/issues/new?component=409906

InvalidColorHexValue

Vendor: Jetpack Compose
Identifier: androidx.compose.ui.graphics
Feedback: https://issuetracker.google.com/issues/new?component=612128

InvalidFragmentVersionForActivityResult

In order to use the ActivityResult APIs you must upgrade your Fragment version to 1.3.0. Previous versions of FragmentActivity failed to call super.onRequestPermissionsResult() and used invalid request codes

More info: https://developer.android.com/training/permissions/requesting#make-the-request

Vendor: Android Open Source Project
Identifier: androidx.activity
Feedback: https://issuetracker.google.com/issues/new?component=527362

InvalidLanguageTagDelimiter

A language tag must be compliant with IETF BCP47, specifically a sequence of subtags must be separated by hyphens (-) instead of underscores (_)

Vendor: Jetpack Compose
Identifier: androidx.compose.ui.text
Feedback: https://issuetracker.google.com/issues/new?component=779818

InvalidPeriodicWorkRequestInterval

The interval duration for a PeriodicWorkRequest must be at least 15 minutes.

Vendor: Android Open Source Project
Identifier: androidx.work
Feedback: https://issuetracker.google.com/issues/new?component=409906

InvalidSetHasFixedSize

When a RecyclerView uses setHasFixedSize(...) you cannot use wrap_content for size in the scrolling direction.

Vendor: Android Open Source Project
Identifier: androidx.recyclerview
Feedback: https://issuetracker.google.com/issues/new?component=460887

InvalidUseOfOnBackPressed

You should not used OnBackPressedCallback for non-UI cases. If you
|add a callback, you have to handle back completely in the callback.

More info: https://developer.android.com/guide/navigation/custom-back/predictive-back-gesture#ui-logic

Vendor: Android Open Source Project
Identifier: androidx.activity
Feedback: https://issuetracker.google.com/issues/new?component=527362

LaunchDuringComposition

Calling launch during composition is incorrect. Doing so will cause launch to be called multiple times resulting in a RuntimeException. Instead, use SideEffect and launch inside of the suspending block. The block will only run after a successful composition.

Vendor: Jetpack Activity Compose
Identifier: androidx.activity.compose
Feedback: https://issuetracker.google.com/issues/new?component=612128

MissingColorAlphaChannel

Creating a Color with a hex value requires a 32 bit value (such as 0xFF000000), with 8 bits being used per channel (ARGB). Not passing a full 32 bit value will result in channels being undefined. For example, passing 0xFF0000 will result in a missing alpha channel, so the color will not appear visible.

Vendor: Jetpack Compose
Identifier: androidx.compose.ui.graphics
Feedback: https://issuetracker.google.com/issues/new?component=612128

ModifierFactoryExtensionFunction

Modifier factory functions should be defined as extension functions on Modifier to allow modifiers to be fluently chained.

Vendor: Jetpack Compose
Identifier: androidx.compose.ui
Feedback: https://issuetracker.google.com/issues/new?component=612128

ModifierFactoryReturnType

Modifier factory functions should return Modifier as their type, and not a subtype of Modifier (such as Modifier.Element).

Vendor: Jetpack Compose
Identifier: androidx.compose.ui
Feedback: https://issuetracker.google.com/issues/new?component=612128

ModifierFactoryUnreferencedReceiver

Modifier factory functions are fluently chained to construct a chain of Modifier objects that will be applied to a layout. As a result, each factory function must use the receiver Modifier parameter, to ensure that the function is returning a chain that includes previous items in the chain. Make sure the returned chain either explicitly includes this, such as return this.then(MyModifier) or implicitly by returning a chain that starts with an implicit call to another factory function, such as return myModifier(), where myModifier is defined as fun Modifier.myModifier(): Modifier.

Vendor: Jetpack Compose
Identifier: androidx.compose.ui
Feedback: https://issuetracker.google.com/issues/new?component=612128

ModifierNodeInspectableProperties

ModifierNodeElements may override inspectableProperties() to provide information about the modifier in the layout inspector. The default implementation attempts to read all of the properties on the class reflectively, which may not comprehensively or effectively describe the modifier.

Vendor: Jetpack Compose
Identifier: androidx.compose.ui
Feedback: https://issuetracker.google.com/issues/new?component=612128

ModifierParameter

The first (or only) Modifier parameter in a Composable function should follow the following rules:
- Be named modifier
- Have a type of Modifier
- Either have no default value, or have a default value of Modifier
- If optional, be the first optional parameter in the parameter list

Vendor: Jetpack Compose
Identifier: androidx.compose.ui
Feedback: https://issuetracker.google.com/issues/new?component=612128

MultipleAwaitPointerEventScopes

Pointer Input events are queued inside awaitPointerEventScope. Multiple calls to awaitPointerEventScope may exit the scope. During this time there is no guarantee that the events will be queued and some events may be dropped. It is recommended to use a single top-level block and perform the pointer events processing within such block.

Vendor: Jetpack Compose
Identifier: androidx.compose.ui
Feedback: https://issuetracker.google.com/issues/new?component=612128

MutableCollectionMutableState

Writes to mutable collections inside a MutableState will not cause a recomposition - only writes to the MutableState itself will. In most cases you should either use a read-only collection (such as List or Map) and assign a new instance to the MutableState when your data changes, or you can use an snapshot-backed collection such as SnapshotStateList or SnapshotStateMap which will correctly cause a recomposition when their contents are modified.

Vendor: Jetpack Compose
Identifier: androidx.compose.runtime
Feedback: https://issuetracker.google.com/issues/new?component=612128

NoCollectCallFound

You must call collect on the progress in the onBack function. The collect call is what properly splits the callback so it knows what to do when the back gestures is started vs when it is completed. Failing to call collect will cause all code in the block to run when the gesture is started.

Vendor: Jetpack Activity Compose
Identifier: androidx.activity.compose
Feedback: https://issuetracker.google.com/issues/new?component=612128

NullSafeMutableLiveData

This check ensures that LiveData values are not null when explicitly declared as non-nullable.

Kotlin interoperability does not support enforcing explicit null-safety when using generic Java type parameters. Since LiveData is a Java class its value can always be null even when its type is explicitly declared as non-nullable. This can lead to runtime exceptions from reading a null LiveData value that is assumed to be non-nullable.

Vendor: Android Open Source Project
Identifier: androidx.lifecycle
Feedback: https://issuetracker.google.com/issues/new?component=413132

OpaqueUnitKey

Certain Compose functions including remember, LaunchedEffect, and DisposableEffect declare (and sometimes require) one or more key parameters. When a key parameter changes, it is a signal that the previous invocation is now invalid. In certain cases, it may be required to pass Unit as a key to one of these functions, indicating that the invocation never becomes invalid. Using Unit as a key should be done infrequently, and should always be done explicitly by passing the Unit literal. This inspection checks for invocations where Unit is being passed as a key argument in any form other than the Unit literal. This is usually done by mistake, and can harm readability. If a Unit expression is being passed as a key, it is always equivalent to move the expression before the function invocation and pass the Unit literal instead.

Vendor: Jetpack Compose
Identifier: androidx.compose.runtime
Feedback: https://issuetracker.google.com/issues/new?component=612128

ProduceStateDoesNotAssignValue

produceState returns an observable State using values assigned inside the producer lambda. If the lambda never assigns (i.e value = foo), then the State will never change. Make sure to assign a value when the source you are producing values from changes / emits a new value. For sample usage see the produceState documentation.

Vendor: Jetpack Compose
Identifier: androidx.compose.runtime
Feedback: https://issuetracker.google.com/issues/new?component=612128

RememberReturnType

A call to remember that returns Unit is always an error. This typically happens when using remember to mutate variables on an object. remember is executed during the composition, which means that if the composition fails or is happening on a separate thread, the mutated variables may not reflect the true state of the composition. Instead, use SideEffect to make deferred changes once the composition succeeds, or mutate MutableState backed variables directly, as these will handle composition failure for you.

Vendor: Jetpack Compose
Identifier: androidx.compose.runtime
Feedback: https://issuetracker.google.com/issues/new?component=612128

RememberSaveableSaverParameter

The first parameter to rememberSaveable is a vararg parameter for inputs that when changed will cause the state to reset. Passing a Saver object to this parameter is an error, as the intention is to pass the Saver object to the saver parameter. Since the saver parameter is not the first parameter, it must be explicitly named.

Vendor: Jetpack Compose
Identifier: androidx.compose.runtime.saveable
Feedback: https://issuetracker.google.com/issues/new?component=612128

RemoveWorkManagerInitializer

If an android.app.Application implements androidx.work.Configuration.Provider,
the default androidx.startup.InitializationProvider needs to be removed from the
AndroidManifest.xml file.

Vendor: Android Open Source Project
Identifier: androidx.work
Feedback: https://issuetracker.google.com/issues/new?component=409906

RepeatOnLifecycleWrongUsage

The repeatOnLifecycle APIs should be used when the View is created, that is in the onCreate lifecycle method for Activities, or onViewCreated in case you're using Fragments.

Vendor: Android Open Source Project
Identifier: androidx.lifecycle
Feedback: https://issuetracker.google.com/issues/new?component=413132

ReturnFromAwaitPointerEventScope

Pointer Input events are queued inside awaitPointerEventScope. By using the return value of awaitPointerEventScope one might unexpectedly lose events. If another awaitPointerEventScope is restarted there is no guarantee that the events will persist between those calls. In this case you should keep all events inside the awaitPointerEventScope block

Vendor: Jetpack Compose
Identifier: androidx.compose.ui
Feedback: https://issuetracker.google.com/issues/new?component=612128

SpecifyForegroundServiceType

When using the setForegroundAsync() API, the application must override <service /> entry for SystemForegroundService to include the foreground service type in the AndroidManifest.xml file.

Vendor: Android Open Source Project
Identifier: androidx.work
Feedback: https://issuetracker.google.com/issues/new?component=409906

SpecifyJobSchedulerIdRange

When using JobScheduler APIs directly, WorkManager requires that developers specify a range of JobScheduler ids that are safe for WorkManager to use so the `id`s do not collide.
For more information look at androidx.work.Configuration.Builder.setJobSchedulerJobIdRange(int, int).

Vendor: Android Open Source Project
Identifier: androidx.work
Feedback: https://issuetracker.google.com/issues/new?component=409906

StateFlowValueCalledInComposition

Calling StateFlow.value within composition will not observe changes to the StateFlow, so changes might not be reflected within the composition. Instead you should use stateFlow.collectAsState() to observe changes to the StateFlow, and recompose when it changes.

Vendor: Jetpack Compose
Identifier: androidx.compose.runtime
Feedback: https://issuetracker.google.com/issues/new?component=612128

SuspiciousCompositionLocalModifierRead

Jetpack Compose is unable to send updated values of a CompositionLocal when it's read in a Modifier.Node's initializer and onAttach() or onDetach() callbacks. Modifier.Node's callbacks are not aware of snapshot reads, and their lifecycle callbacks are not invoked on every recomposition. If you read a CompositionLocal in onAttach() or onDetach(), you will only get the CompositionLocal's value once at the moment of the read, which may lead to unexpected behaviors. We recommend instead reading CompositionLocals at time-of-use in callbacks that apply your Modifier's behavior, like measure() for LayoutModifierNode, draw() for DrawModifierNode, and so on. To observe the value of the CompositionLocal manually, extend from the ObserverNode interface and place the read inside an observeReads {} block within the onObservedReadsChanged() callback.

Vendor: Jetpack Compose
Identifier: androidx.compose.ui
Feedback: https://issuetracker.google.com/issues/new?component=612128

SuspiciousModifierThen

Calling a Modifier factory function with an implicit receiver inside Modifier.then will result in the receiver (this) being added twice to the chain. For example, fun Modifier.myModifier() = this.then(otherModifier()) - the implementation of factory functions such as Modifier.otherModifier() will internally call this.then(...) to chain the provided modifier with their implementation. When you expand this.then(otherModifier()), it becomes: this.then(this.then(OtherModifierImplementation)) - so you can see that this is included twice in the chain, which results in modifiers such as padding being applied twice, for example. Instead, you should either remove the then() and directly chain the factory function on the receiver, this.otherModifier(), or add the empty Modifier as the receiver for the factory, such as this.then(Modifier.otherModifier())

Vendor: Jetpack Compose
Identifier: androidx.compose.ui
Feedback: https://issuetracker.google.com/issues/new?component=612128

TestManifestGradleConfiguration

The androidx.compose.ui:ui-test-manifest dependency is needed for launching a Compose host, such as with createComposeRule. However, it only needs to be present in testing configurations therefore use this dependency with the debugImplementation configuration

More info: https://developer.android.com/jetpack/compose/testing#setup

Vendor: Android Open Source Project
Identifier: androidx.compose.ui.test.manifest
Feedback: https://issuetracker.google.com/issues/new?component=741505

UnnecessaryComposedModifier

Modifier.composed allows invoking @Composable functions when creating a Modifier instance - for example, using remember to have instance-specific state, allowing the same Modifier object to be safely used in multiple places. Using Modifier.composed without calling any @Composable functions inside is unnecessary, and since the Modifier is no longer skippable, this can cause a lot of extra work inside the composed body, leading to worse performance.

Vendor: Jetpack Compose
Identifier: androidx.compose.ui
Feedback: https://issuetracker.google.com/issues/new?component=612128

UnrememberedAnimatable

Animatable instances created during composition need to be `remember`ed, otherwise they will be recreated during recomposition, and lose their state. Either hoist the Animatable to an object that is not created during composition, or wrap the Animatable in a call to remember.

Vendor: Jetpack Compose
Identifier: androidx.compose.animation.core
Feedback: https://issuetracker.google.com/issues/new?component=612128

UnrememberedMutableInteractionSource

MutableInteractionSource instances created during composition need to be `remember`ed, otherwise they will be recreated during recomposition, and lose their state. Either hoist the MutableInteractionSource to an object that is not created during composition, or wrap the MutableInteractionSource in a call to remember.

Vendor: Jetpack Compose
Identifier: androidx.compose.foundation
Feedback: https://issuetracker.google.com/issues/new?component=612128

UnrememberedMutableState

State objects created during composition need to be `remember`ed, otherwise they will be recreated during recomposition, and lose their state. Either hoist the state to an object that is not created during composition, or wrap the state in a call to remember.

Vendor: Jetpack Compose
Identifier: androidx.compose.runtime
Feedback: https://issuetracker.google.com/issues/new?component=612128

UnsafeLifecycleWhenUsage

If the Lifecycle is destroyed within the block of Lifecycle.whenStarted or any similar Lifecycle.when method is suspended, the block will be cancelled, which will also cancel any child coroutine launched inside the block. As as a result, If you have a try finally block in your code, the finally might run after the Lifecycle moves outside the desired state. It is recommended to check the Lifecycle.isAtLeast before accessing UI in finally block. Similarly, if you have a catch statement that might catch CancellationException, you should check the Lifecycle.isAtLeast before accessing the UI. See documentation of Lifecycle.whenStateAtLeast for more details

Vendor: Android Open Source Project
Identifier: androidx.lifecycle
Feedback: https://issuetracker.google.com/issues/new?component=413132

UnsafeOptInUsageError

<lint>
    <issue id="UnsafeOptInUsageError">
        <option name="opt-in" value="com.foo.ExperimentalBarAnnotation" />
    </issue>
</lint>

Vendor: Android Open Source Project
Identifier: androidx.annotation.experimental
Feedback: https://issuetracker.google.com/issues/new?component=459778

UnsafeOptInUsageWarning

This API has been flagged as opt-in with warning-level severity.

Any declaration annotated with this marker is considered part of an unstable or
otherwise non-standard API surface and its call sites should accept the opt-in
aspect of it by using the @OptIn annotation, using the marker annotation --
effectively causing further propagation of the opt-in aspect -- or configuring
the UnsafeOptInUsageWarning check's options for project-wide opt-in.

To configure project-wide opt-in, specify the opt-in option value in lint.xml
as a comma-delimited list of opted-in annotations:

<lint>
    <issue id="UnsafeOptInUsageWarning">
        <option name="opt-in" value="com.foo.ExperimentalBarAnnotation" />
    </issue>
</lint>

Vendor: Android Open Source Project
Identifier: androidx.annotation.experimental
Feedback: https://issuetracker.google.com/issues/new?component=459778

UnsafeRepeatOnLifecycleDetector

The repeatOnLifecycle APIs should be used with the viewLifecycleOwner in Fragments as opposed to lifecycleOwner.

Vendor: Android Open Source Project
Identifier: androidx.fragment
Feedback: https://issuetracker.google.com/issues/new?component=460964

UnusedBoxWithConstraintsScope

The content lambda in BoxWithConstraints has a scope which will include the incoming constraints. If this scope is ignored, then the cost of subcomposition is being wasted and this BoxWithConstraints should be replaced with a Box.

Vendor: Jetpack Compose
Identifier: androidx.compose.foundation
Feedback: https://issuetracker.google.com/issues/new?component=612128

UnusedContentLambdaTargetStateParameter

content lambda in AnimatedContent works as a lookup function that returns the corresponding content based on the parameter (a state of type T). It is important for this lambda to return content specific to the input parameter, so that the different contents can be properly animated. Not using the input parameter to the content lambda will result in the same content for different input (i.e. target state) and therefore an erroneous transition between the exact same content.`

Vendor: Jetpack Compose
Identifier: androidx.compose.animation
Feedback: https://issuetracker.google.com/issues/new?component=612128

UnusedCrossfadeTargetStateParameter

content lambda in Crossfade works as a lookup function that returns the corresponding content based on the parameter (a state of type T). It is important for this lambda to return content specific to the input parameter, so that the different contents can be properly crossfaded. Not using the input parameter to the content lambda will result in the same content for different input (i.e. target state) and therefore an erroneous crossfade between the exact same content.`

Vendor: Jetpack Compose
Identifier: androidx.compose.animation
Feedback: https://issuetracker.google.com/issues/new?component=612128

UnusedMaterial3ScaffoldPaddingParameter

The content lambda in Scaffold has a padding parameter which will include any inner padding for the content due to app bars. If this parameter is ignored, then content may be obscured by the app bars resulting in visual issues or elements that can't be interacted with.

Vendor: Jetpack Compose
Identifier: androidx.compose.material3
Feedback: https://issuetracker.google.com/issues/new?component=612128

UnusedMaterialScaffoldPaddingParameter

Vendor: Jetpack Compose
Identifier: androidx.compose.material
Feedback: https://issuetracker.google.com/issues/new?component=612128

UnusedTransitionTargetStateParameter

Transition.animate* functions provide a target state parameter in the lambda that will be used to calculate the value for a given state. This target state parameter in the lambda may or may not be the same as the actual state, as the animation system occasionally needs to look up target values for other states to do proper seeking/tooling preview. Relying on other state than the provided targetState could also result in unnecessary recompositions. Therefore, it is generally considered an error if this targetState parameter is not used.

Vendor: Jetpack Compose
Identifier: androidx.compose.animation.core
Feedback: https://issuetracker.google.com/issues/new?component=612128

UseAndroidAlpha

ColorStateList uses app:alpha without android:alpha

Vendor: Android Open Source Project
Identifier: androidx.appcompat
Feedback: https://issuetracker.google.com/issues/new?component=460343

UseAppTint

ImageView or ImageButton uses android:tint instead of app:tint

Vendor: Android Open Source Project
Identifier: androidx.appcompat
Feedback: https://issuetracker.google.com/issues/new?component=460343

UseCompatLoadingForColorStateLists

Use Compat loading of color state lists

Vendor: Android Open Source Project
Identifier: androidx.appcompat
Feedback: https://issuetracker.google.com/issues/new?component=460343

UseCompatLoadingForDrawables

Use Compat loading of drawables

Vendor: Android Open Source Project
Identifier: androidx.appcompat
Feedback: https://issuetracker.google.com/issues/new?component=460343

UseCompatTextViewDrawableApis

Use Compat loading of compound text view drawables

Vendor: Android Open Source Project
Identifier: androidx.appcompat
Feedback: https://issuetracker.google.com/issues/new?component=460343

UseCompatTextViewDrawableXml

TextView uses android: compound drawable attributes instead of app: ones

Vendor: Android Open Source Project
Identifier: androidx.appcompat
Feedback: https://issuetracker.google.com/issues/new?component=460343

UseGetLayoutInflater

Using LayoutInflater.from(Context) can return a LayoutInflater that does not have the correct theme.

Vendor: Android Open Source Project
Identifier: androidx.fragment
Feedback: https://issuetracker.google.com/issues/new?component=460964

UseOfNonLambdaOffsetOverload

Modifier.offset() is recommended to be used with static arguments only to avoid unnecessary recompositions. Modifier.offset{ } is preferred in the cases where the arguments are backed by a State.

Vendor: Jetpack Compose
Identifier: androidx.compose.foundation
Feedback: https://issuetracker.google.com/issues/new?component=612128

UseRequireInsteadOfGet

AndroidX added new "require____()" versions of common "get___()" APIs, such as getContext/getActivity/getArguments/etc. Rather than wrap these in something like requireNotNull(), using these APIs will allow the underlying component to try to tell you _why_ it was null, and thus yield a better error message.

Vendor: Android Open Source Project
Identifier: androidx.fragment
Feedback: https://issuetracker.google.com/issues/new?component=460964

UseRxSetProgress2

Use setCompletableProgress(...) instead of `setProgress(...) in RxWorker.

Vendor: Android Open Source Project
Identifier: androidx.work
Feedback: https://issuetracker.google.com/issues/new?component=409906

UseSupportActionBar

Use AppCompatActivity.setSupportActionBar

Vendor: Android Open Source Project
Identifier: androidx.appcompat
Feedback: https://issuetracker.google.com/issues/new?component=460343

UseSwitchCompatOrMaterialCode

Use SwitchCompat from AppCompat or MaterialSwitch from Material library

Vendor: Android Open Source Project
Identifier: androidx.appcompat
Feedback: https://issuetracker.google.com/issues/new?component=460343

UseSwitchCompatOrMaterialXml

Use SwitchCompat from AppCompat or MaterialSwitch from Material library

Vendor: Android Open Source Project
Identifier: androidx.appcompat
Feedback: https://issuetracker.google.com/issues/new?component=460343

UsingMaterialAndMaterial3Libraries

material and material3 are separate design system libraries that are incompatible with each other, as they have their own distinct theming systems. Using components from both libraries concurrently can cause issues: for example material components will not pick up the correct content color from a material3 container, and vice versa.

Vendor: Jetpack Compose
Identifier: androidx.compose.material3
Feedback: https://issuetracker.google.com/issues/new?component=612128

UsingOnClickInXml

Old versions of the platform do not properly support resolving android:onClick

Vendor: Android Open Source Project
Identifier: androidx.appcompat
Feedback: https://issuetracker.google.com/issues/new?component=460343

WorkerHasAPublicModifier

When you define a ListenableWorker which is constructed using the
default WorkerFactory, the ListenableWorker sub-type needs to be public.

Vendor: Android Open Source Project
Identifier: androidx.work
Feedback: https://issuetracker.google.com/issues/new?component=409906

WrongRequiresOptIn

Experimental features defined in Kotlin source code must be annotated with the Kotlin
@RequiresOptIn annotation. Using androidx.annotation.RequiresOptIn will prevent the
Kotlin compiler from enforcing its opt-in policies.

Vendor: Android Open Source Project
Identifier: androidx.annotation.experimental
Feedback: https://issuetracker.google.com/issues/new?component=459778

Disabled Checks

One or more issues were not run by lint, either because the check is not enabled by default, or because it was disabled with a command line flag or via one or more lint.xml configuration files in the project directories.

AppCompatMethod

Disabled By: Default

When using the appcompat library, there are some methods you should be calling instead of the normal ones; for example, getSupportActionBar() instead of getActionBar(). This lint check looks for calls to the wrong method.

More info: https://developer.android.com/topic/libraries/support-library/

Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

AppLinksAutoVerify

Disabled By: Default

Ensures that app links are correctly set and associated with website.

More info: https://g.co/appindexing/applinks

BackButton

Disabled By: Default

According to the Android Design Guide,

"Other platforms use an explicit back button with label to allow the user to navigate up the application's hierarchy. Instead, Android uses the main action bar's app icon for hierarchical navigation and the navigation bar's back button for temporal navigation."

This check is not very sophisticated (it just looks for buttons with the label "Back"), so it is disabled by default to not trigger on common scenarios like pairs of Back/Next buttons to paginate through screens.

More info: https://d.android.com/r/studio-ui/designer/material/design

ComposableLambdaParameterNaming

Disabled By: Default

Composable functions with only one composable lambda parameter should use the name content for the parameter.

ComposableLambdaParameterPosition

Disabled By: Default

Composable functions with only one composable lambda parameter should place the parameter at the end of the parameter list, so it can be used as a trailing lambda.

ConvertToWebp

Disabled By: Default

The WebP format is typically more compact than PNG and JPEG. As of Android 4.2.1 it supports transparency and lossless conversion as well. Note that there is a quickfix in the IDE which lets you perform conversion.

Previously, launcher icons were required to be in the PNG format but that restriction is no longer there, so lint now flags these.
Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

DalvikOverride

Disabled By: Default

The Dalvik virtual machine will treat a package private method in one class as overriding a package private method in its super class, even if they are in separate packages.

If you really did intend for this method to override the other, make the method protected instead.

If you did not intend the override, consider making the method private, or changing its name or signature.

Note that this check is disabled be default, because ART (the successor to Dalvik) no longer has this behavior.

DefaultEncoding

Disabled By: Default

Some APIs will implicitly use the default system character encoding instead of UTF-8 when converting to or from bytes, such as when creating a default FileReader.

This is usually not correct; you only want to do this if you need to read files created by other programs where they have deliberately written in the same encoding. The default encoding varies from platform to platform and can vary from locale to locale, so this makes it difficult to interpret files containing non-ASCII characters.

We recommend using UTF-8 everywhere.

Note that on Android, the default file encoding is always UTF-8 (see https://developer.android.com/reference/java/nio/charset/Charset#defaultCharset() for more), so this lint check deliberately does not flag any problems in Android code, since it is always safe to rely on the default character encoding there.

DuplicateStrings

Disabled By: Default

Duplicate strings can make applications larger unnecessarily.

This lint check looks for duplicate strings, including differences for strings where the only difference is in capitalization. Title casing and all uppercase can all be adjusted in the layout or in code.

More info: https://developer.android.com/reference/android/widget/TextView.html#attr_android:inputType

EasterEgg

Disabled By: Default

An "easter egg" is code deliberately hidden in the code, both from potential users and even from other developers. This lint check looks for code which looks like it may be hidden from sight.

ExpensiveAssertion

Disabled By: Default

In Kotlin, assertions are not handled the same way as from the Java programming language. In particular, they're just implemented as a library call, and inside the library call the error is only thrown if assertions are enabled.

This means that the arguments to the assert call will always be evaluated. If you're doing any computation in the expression being asserted, that computation will unconditionally be performed whether or not assertions are turned on. This typically turns into wasted work in release builds.

This check looks for cases where the assertion condition is nontrivial, e.g. it is performing method calls or doing more work than simple comparisons on local variables or fields.

You can work around this by writing your own inline assert method instead:

@Suppress("INVISIBLE_REFERENCE", "INVISIBLE_MEMBER")
inline fun assert(condition: () -> Boolean) {
    if (_Assertions.ENABLED && !condition()) {
        throw AssertionError()
    }
}

In Android, because assertions are not enforced at runtime, instead use this:

inline fun assert(condition: () -> Boolean) {
    if (BuildConfig.DEBUG && !condition()) {
        throw AssertionError()
    }
}

Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

IconExpectedSize

Disabled By: Default

There are predefined sizes (for each density) for launcher icons. You should follow these conventions to make sure your icons fit in with the overall look of the platform.

More info: https://d.android.com/r/studio-ui/designer/material/iconography

ImplicitSamInstance

Disabled By: Default

Kotlin's support for SAM (single accessor method) interfaces lets you pass a lambda to the interface. This will create a new instance on the fly even though there is no explicit constructor call. If you pass one of these lambdas or method references into a method which (for example) stores or compares the object identity, unexpected results may happen.
Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

InvalidPackage

Disabled By: Command line flag

This check scans through libraries looking for calls to APIs that are not included in Android.

When you create Android projects, the classpath is set up such that you can only access classes in the API packages that are included in Android. However, if you add other projects to your libs/ folder, there is no guarantee that those .jar files were built with an Android specific classpath, and in particular, they could be accessing unsupported APIs such as java.applet.

This check scans through library jars and looks for references to API packages that are not included in Android and flags these. This is only an error if your code calls one of the library classes which wind up referencing the unsupported package.

KotlinPropertyAccess

Disabled By: Default

For a method to be represented as a property in Kotlin, strict “bean”-style prefixing must be used.

Accessor methods require a get prefix or for boolean-returning methods an is prefix can be used.

More info: https://android.github.io/kotlin-guides/interop.html#property-prefixes

KotlincFE10

Disabled By: Default

K2, the new version of Kotlin compiler, which encompasses the new frontend, is coming. Try to avoid using internal APIs from the old frontend if possible.

LambdaLast

Disabled By: Default

To improve calling this code from Kotlin, parameter types eligible for SAM conversion should be last.

More info: https://android.github.io/kotlin-guides/interop.html#lambda-parameters-last

LintDocExample

Disabled By: Default

Lint's tool for generating documentation for each issue has special support for including a code example which shows how to trigger the report. It will pick the first unit test it can find and pick out the source file referenced from the error message, but you can instead designate a unit test to be the documentation example, and in that case, all the files are included.

To designate a unit test as the documentation example for an issue, name the test testDocumentationExample, or if your detector reports multiple issues, testDocumentationExample<Id>, such as testDocumentationExampleMyId.

LintImplPsiEquals

Disabled By: Default

You should never compare two PSI elements for equality with equals; use PsiEquivalenceUtil.areElementsEquivalent(PsiElement, PsiElement) instead.

LintImplUnexpectedDomain

Disabled By: Default

This checks flags URLs to domains that have not been explicitly allowed for use as a documentation source.

LogConditional

Disabled By: Default

The BuildConfig class provides a constant, DEBUG, which indicates whether the code is being built in release mode or in debug mode. In release mode, you typically want to strip out all the logging calls. Since the compiler will automatically remove all code which is inside a if (false) check, surrounding your logging calls with a check for BuildConfig.DEBUG is a good idea.

If you really intend for the logging to be present in release mode, you can suppress this warning with a @SuppressLint annotation for the intentional logging calls.

MangledCRLF

Disabled By: Default

On Windows, line endings are typically recorded as carriage return plus newline: \r\n.

This detector looks for invalid line endings with repeated carriage return characters (without newlines). Previous versions of the ADT plugin could accidentally introduce these into the file, and when editing the file, the editor could produce confusing visual artifacts.

More info: https://bugs.eclipse.org/bugs/show_bug.cgi?id=375421

MinSdkTooLow

Disabled By: Default

The value of the minSdkVersion property is too low and can be incremented without noticeably reducing the number of supported devices.
Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

MissingTranslation

Disabled By: Command line flag

If an application has more than one locale, then all the strings declared in one language should also be translated in all other languages.

If the string should not be translated, you can add the attribute translatable="false" on the <string> element, or you can define all your non-translatable strings in a resource file called donottranslate.xml. Or, you can ignore the issue with a tools:ignore="MissingTranslation" attribute.

You can tell lint (and other tools) which language is the default language in your res/values/ folder by specifying tools:locale="languageCode" for the root <resources> element in your resource file. (The tools prefix refers to the namespace declaration http://schemas.android.com/tools.)
Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

NegativeMargin

Disabled By: Default

Margin values should be positive. Negative values are generally a sign that you are making assumptions about views surrounding the current one, or may be tempted to turn off child clipping to allow a view to escape its parent. Turning off child clipping to do this not only leads to poor graphical performance, it also results in wrong touch event handling since touch events are based strictly on a chain of parent-rect hit tests. Finally, making assumptions about the size of strings can lead to localization problems.

NewerVersionAvailable

Disabled By: Default

This detector checks with a central repository to see if there are newer versions available for the dependencies used by this project. This is similar to the GradleDependency check, which checks for newer versions available in the Android SDK tools and libraries, but this works with any MavenCentral dependency, and connects to the library every time, which makes it more flexible but also much slower.
Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

NoHardKeywords

Disabled By: Default

Do not use Kotlin’s hard keywords as the name of methods or fields. These require the use of backticks to escape when calling from Kotlin. Soft keywords, modifier keywords, and special identifiers are allowed.

For example, ActionEvent's getWhen() method requires backticks when used from Kotlin:

val timestamp = event.`when`

More info: https://android.github.io/kotlin-guides/interop.html#no-hard-keywords

NoOp

Disabled By: Default

This check looks for code which looks like it's a no-op -- usually leftover expressions from interactive debugging, but in some cases bugs where you had intended to do something with the expression such as assign it to a field.

This check can be configured via the following options:

pure-getters (default is false):
Whether to assume methods with getter-names have no side effects.

Getter methods (where names start with get or is, and have non-void return types, and no arguments) should not have side effects. With this option turned on, lint will assume that is the case and will list any getter calls whose results are ignored as suspicious code.

To configure this option, use a `lint.xml` file in the project or source folder using an <option> block like the following:

 1 <lint>
 2     <issue id="NoOp">
 3         <option name="pure-getters" value="false" />                                                
 4     </issue>
 5 </lint>

PermissionNamingConvention

Disabled By: Default

Permissions should be prefixed with an app's package name, using reverse-domain-style naming. This prefix should be followed by .permission., and then a description of the capability that the permission represents, in upper SNAKE_CASE. For example, com.example.myapp.permission.ENGAGE_HYPERSPACE.

Following this recommendation avoids naming collisions, and helps clearly identify the owner and intention of a custom permission.

PrivateResource

Disabled By: Command line flag

Private resources should not be referenced; the may not be present everywhere, and even where they are they may disappear without notice.

To fix this, copy the resource into your own project instead.

Registered

Disabled By: Default

Activities, services and content providers should be registered in the AndroidManifest.xml file using <activity>, <service> and <provider> tags.

If your activity is simply a parent class intended to be subclassed by other "real" activities, make it an abstract class.

More info: https://developer.android.com/guide/topics/manifest/manifest-intro.html

RequiredSize

Disabled By: Default

All views must specify an explicit layout_width and layout_height attribute. There is a runtime check for this, so if you fail to specify a size, an exception is thrown at runtime.

It's possible to specify these widths via styles as well. GridLayout, as a special case, does not require you to specify a size.

SelectableText

Disabled By: Default

If a <TextView> is used to display data, the user might want to copy that data and paste it elsewhere. To allow this, the <TextView> should specify android:textIsSelectable="true".

This lint check looks for TextViews which are likely to be displaying data: views whose text is set dynamically.
Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

StopShip

Disabled By: Default

Using the comment // STOPSHIP can be used to flag code that is incomplete but checked in. This comment marker can be used to indicate that the code should not be shipped until the issue is addressed, and lint will look for these. In Gradle projects, this is only checked for non-debug (release) builds.

In Kotlin, the TODO() method is also treated as a stop ship marker; you can use it to make incomplete code compile, but it will throw an exception at runtime and therefore should be fixed before shipping releases.
Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

StringFormatTrivial

Disabled By: Default

Every call to String.format creates a new Formatter instance, which will decrease the performance of your app. String.format should only be used when necessary--if the formatted string contains only trivial conversions (e.g. b, s, c) and there are no translation concerns, it will be more efficient to replace them and concatenate with +.

SyntheticAccessor

Disabled By: Default

A private inner class which is accessed from the outer class will force the compiler to insert a synthetic accessor; this means that you are causing extra overhead. This is not important in small projects, but is important for large apps running up against the 64K method handle limit, and especially for libraries where you want to make sure your library is as small as possible for the cases where your library is used in an app running up against the 64K limit.
Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

TypographyQuotes

Disabled By: Default

Straight single quotes and double quotes, when used as a pair, can be replaced by "curvy quotes" (or directional quotes). Use the right single quotation mark for apostrophes. Never use generic quotes ", ' or free-standing accents `, ´ for quotation marks, apostrophes, or primes. This can make the text more readable.

More info: https://en.wikipedia.org/wiki/Quotation_mark

Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

UnknownNullness

Disabled By: Default

To improve referencing this code from Kotlin, consider adding explicit nullness information here with either @NonNull or @Nullable.

This check can be configured via the following options:

ignore-deprecated (default is false):
Whether to ignore classes and members that have been annotated with @Deprecated.

Normally this lint check will flag all unannotated elements, but by setting this option to true it will skip any deprecated elements.

To configure this option, use a `lint.xml` file in the project or source folder using an <option> block like the following:

 1 <lint>
 2     <issue id="UnknownNullness">
 3         <option name="ignore-deprecated" value="false" />                                           
 4     </issue>
 5 </lint>

More info: https://developer.android.com/kotlin/interop#nullability_annotations

Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

UnsupportedChromeOsHardware

Disabled By: Default

The <uses-feature> element should not require this unsupported large screen hardware feature. Any <uses-feature> not explicitly marked with required="false" is necessary on the device to be installed on. Ensure that any features that might prevent it from being installed on a ChromeOS, large screen, or foldable device are reviewed and marked as not required in the manifest.

More info: https://developer.android.com/topic/arc/manifest.html#incompat-entries

Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

UnusedIds

Disabled By: Default

This resource id definition appears not to be needed since it is not referenced from anywhere. Having id definitions, even if unused, is not necessarily a bad idea since they make working on layouts and menus easier, so there is not a strong reason to delete these.

The unused resource check can ignore tests. If you want to include resources that are only referenced from tests, consider packaging them in a test source set instead.

You can include test sources in the unused resource check by setting the system property lint.unused-resources.include-tests =true, and to exclude them (usually for performance reasons), use lint.unused-resources.exclude-tests =true.

Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

UnusedQuantity

Disabled By: Command line flag

Android defines a number of different quantity strings, such as zero, one, few and many. However, many languages do not distinguish grammatically between all these different quantities.

This lint check looks at the quantity strings defined for each translation and flags any quantity strings that are unused (because the language does not make that quantity distinction, and Android will therefore not look it up).

For example, in Chinese, only the other quantity is used, so even if you provide translations for zero and one, these strings will not be returned when getQuantityString() is called, even with 0 or 1.

More info: https://developer.android.com/guide/topics/resources/string-resource.html#Plurals

ValidActionsXml

Disabled By: Default

Ensures that an actions XML file is properly formed
Note: This issue has an associated quickfix operation in Android Studio and IntelliJ IDEA.

VectorPath

Disabled By: Command line flag

Using long vector paths is bad for performance. There are several ways to make the pathData shorter:
* Using less precision
* Removing some minor details
* Using the Android Studio vector conversion tool
* Rasterizing the image (converting to PNG)

VulnerableCordovaVersion

Disabled By: Default

The version of Cordova used in the app is vulnerable to security issues. Please update to the latest Apache Cordova version.

More info: https://cordova.apache.org/announcements/2015/11/20/security.html

WrongThreadInterprocedural

Disabled By: Default

Searches for interprocedural call paths that violate thread annotations in the program. Tracks the flow of instantiated types and lambda expressions to increase accuracy across method boundaries.

More info: https://developer.android.com/guide/components/processes-and-threads.html#Threads

Suppressing Warnings and Errors

Lint errors can be suppressed in a variety of ways:

1. With a @SuppressLint annotation in the Java code
2. With a tools:ignore attribute in the XML file
3. With a //noinspection comment in the source code
4. With ignore flags specified in the build.gradle file, as explained below
5. With a lint.xml configuration file in the project
6. With a lint.xml configuration file passed to lint via the --config flag
7. With the --ignore flag passed to lint.

To suppress a lint warning with an annotation, add a @SuppressLint("id") annotation on the class, method or variable declaration closest to the warning instance you want to disable. The id can be one or more issue id's, such as "UnusedResources" or {"UnusedResources","UnusedIds"}, or it can be "all" to suppress all lint warnings in the given scope.

To suppress a lint warning with a comment, add a //noinspection id comment on the line before the statement with the error.

To suppress a lint warning in an XML file, add a tools:ignore="id" attribute on the element containing the error, or one of its surrounding elements. You also need to define the namespace for the tools prefix on the root element in your document, next to the xmlns:android declaration:
xmlns:tools="http://schemas.android.com/tools"

To suppress a lint warning in a build.gradle file, add a section like this:

android {
    lintOptions {
        disable 'TypographyFractions','TypographyQuotes'
    }
}

Here we specify a comma separated list of issue id's after the disable command. You can also use warning or error instead of disable to change the severity of issues.

To suppress lint warnings with a configuration XML file, create a file named lint.xml and place it at the root directory of the module in which it applies.

The format of the lint.xml file is something like the following:

<?xml version="1.0" encoding="UTF-8"?>
<lint>
    <!-- Ignore everything in the test source set -->
    <issue id="all">
        <ignore path="\*/test/\*" />
    </issue>

    <!-- Disable this given check in this project -->
    <issue id="IconMissingDensityFolder" severity="ignore" />

    <!-- Ignore the ObsoleteLayoutParam issue in the given files -->
    <issue id="ObsoleteLayoutParam">
        <ignore path="res/layout/activation.xml" />
        <ignore path="res/layout-xlarge/activation.xml" />
        <ignore regexp="(foo|bar)\.java" />
    </issue>

    <!-- Ignore the UselessLeaf issue in the given file -->
    <issue id="UselessLeaf">
        <ignore path="res/layout/main.xml" />
    </issue>

    <!-- Change the severity of hardcoded strings to "error" -->
    <issue id="HardcodedText" severity="error" />
</lint>

To suppress lint checks from the command line, pass the --ignore flag with a comma separated list of ids to be suppressed, such as:
$ lint --ignore UnusedResources,UselessLeaf /my/project/path

For more information, see https://developer.android.com/studio/write/lint.html#config