diff --git a/app/build.gradle b/app/build.gradle
index 23109f24ad6d5897ebb05b676369ee947515ecb8..055b62fdc9581984aa266d5cd1d3af12c88a1d5e 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -112,6 +112,9 @@ android {
     lint {
         lintConfig file('lint.xml')
     }
+    kotlin.sourceSets.all {
+        languageSettings.useExperimentalAnnotation("kotlin.RequiresOptIn")
+    }
 }
 
 kapt {
diff --git a/app/src/main/java/foundation/e/apps/MainActivity.kt b/app/src/main/java/foundation/e/apps/MainActivity.kt
index 00b90776ff133b380fdeb83d82b4f4b81cd804d9..e8d578f918e2004ba57aa52ec7dafeb1457a2756 100644
--- a/app/src/main/java/foundation/e/apps/MainActivity.kt
+++ b/app/src/main/java/foundation/e/apps/MainActivity.kt
@@ -304,8 +304,7 @@ class MainActivity : AppCompatActivity() {
 
     // TODO: move storage availability code to FileManager Class
     private fun isStorageAvailable(fusedDownload: FusedDownload): Boolean {
-        var availableSpace = 0L
-        availableSpace = calculateAvailableDiskSpace()
+        val availableSpace = calculateAvailableDiskSpace()
         return availableSpace > fusedDownload.appSize + (500 * (1000 * 1000))
     }
 
diff --git a/app/src/main/java/foundation/e/apps/api/DownloadManager.kt b/app/src/main/java/foundation/e/apps/api/DownloadManager.kt
index 3d6f64dbfc2f703494c72708bc100098a7724122..75870439992ae8ee39d75f0e16f9adf4d746b3f1 100644
--- a/app/src/main/java/foundation/e/apps/api/DownloadManager.kt
+++ b/app/src/main/java/foundation/e/apps/api/DownloadManager.kt
@@ -103,8 +103,6 @@ class DownloadManager @Inject constructor(
             downloadManager.query(downloadManagerQuery.setFilterById(downloadId))
                 .use { cursor ->
                     if (cursor.moveToFirst()) {
-                        val id =
-                            cursor.getLong(cursor.getColumnIndexOrThrow(DownloadManager.COLUMN_ID))
                         val status =
                             cursor.getInt(cursor.getColumnIndexOrThrow(DownloadManager.COLUMN_STATUS))
                         val totalSizeBytes =
diff --git a/app/src/main/java/foundation/e/apps/api/cleanapk/blockedApps/BlockedAppRepository.kt b/app/src/main/java/foundation/e/apps/api/cleanapk/blockedApps/BlockedAppRepository.kt
index 2ab84a6627a323acc8fb6d44064965b354a6f79f..5e09583cebe950a3a4e98303cf626f57d35b5be6 100644
--- a/app/src/main/java/foundation/e/apps/api/cleanapk/blockedApps/BlockedAppRepository.kt
+++ b/app/src/main/java/foundation/e/apps/api/cleanapk/blockedApps/BlockedAppRepository.kt
@@ -50,15 +50,15 @@ class BlockedAppRepository @Inject constructor(
     fun fetchUpdateOfAppWarningList() {
         downloadManager.downloadFileInCache(
             APP_WARNING_LIST_FILE_URL,
-            fileName = "app-lounge-warning-list.json"
-        ) { success, path ->
+            fileName = WARNING_LIST_FILE_NAME
+        ) { success, _ ->
             if (success) {
-                parseBlockedAppDataFromFile(path)
+                parseBlockedAppDataFromFile()
             }
         }
     }
 
-    private fun parseBlockedAppDataFromFile(path: String) {
+    private fun parseBlockedAppDataFromFile() {
         coroutineScope.launch {
             val outputPath = "$cacheDir/warning_list/"
             FileManager.moveFile("$cacheDir/", WARNING_LIST_FILE_NAME, outputPath)
diff --git a/app/src/main/java/foundation/e/apps/api/fused/FusedAPIImpl.kt b/app/src/main/java/foundation/e/apps/api/fused/FusedAPIImpl.kt
index 8f29b05690534647a83f25520b215ef1ff4ccfbf..889cbb9993a6a285b02b47e9e803dc5b37bbde12 100644
--- a/app/src/main/java/foundation/e/apps/api/fused/FusedAPIImpl.kt
+++ b/app/src/main/java/foundation/e/apps/api/fused/FusedAPIImpl.kt
@@ -948,7 +948,7 @@ class FusedAPIImpl @Inject constructor(
         runCodeBlockWithTimeout({
             val playResponse = gPlayAPIRepository.getCategoriesList(type, authData).map { app ->
                 val category = app.transformToFusedCategory()
-                updateCategoryDrawable(category, app)
+                updateCategoryDrawable(category)
                 category
             }
             categoryList.addAll(playResponse)
@@ -1045,7 +1045,6 @@ class FusedAPIImpl @Inject constructor(
 
     private fun updateCategoryDrawable(
         category: FusedCategory,
-        app: Category
     ) {
         category.drawable =
             getCategoryIconResource(getCategoryIconName(category))
@@ -1083,7 +1082,7 @@ class FusedAPIImpl @Inject constructor(
         tag: AppTag
     ): List<FusedCategory> {
         return categories.apps.map { category ->
-            createFusedCategoryFromCategory(category, categories, Category.Type.APPLICATION, tag)
+            createFusedCategoryFromCategory(category, categories, tag)
         }
     }
 
@@ -1092,14 +1091,13 @@ class FusedAPIImpl @Inject constructor(
         tag: AppTag
     ): List<FusedCategory> {
         return categories.games.map { category ->
-            createFusedCategoryFromCategory(category, categories, Category.Type.GAME, tag)
+            createFusedCategoryFromCategory(category, categories, tag)
         }
     }
 
     private fun createFusedCategoryFromCategory(
         category: String,
         categories: Categories,
-        appType: Category.Type,
         tag: AppTag
     ): FusedCategory {
         return FusedCategory(
diff --git a/app/src/main/java/foundation/e/apps/applicationlist/ApplicationListFragment.kt b/app/src/main/java/foundation/e/apps/applicationlist/ApplicationListFragment.kt
index aa1bb75d10a2cccd99c8903fb5ebfdc49f8ad48f..186d7b61753beaba5f3370b54747f5759d65c411 100644
--- a/app/src/main/java/foundation/e/apps/applicationlist/ApplicationListFragment.kt
+++ b/app/src/main/java/foundation/e/apps/applicationlist/ApplicationListFragment.kt
@@ -112,7 +112,7 @@ class ApplicationListFragment :
 
         recyclerView.apply {
             adapter = listAdapter
-            layoutManager = LinearLayoutManager(view?.context)
+            layoutManager = LinearLayoutManager(view.context)
         }
     }
 
@@ -161,7 +161,7 @@ class ApplicationListFragment :
     private fun observeAppListLiveData() {
         viewModel.appListLiveData.observe(viewLifecycleOwner) {
             stopLoadingUI()
-            if (it.isSuccess()) {
+            if (it != null && it.isSuccess()) {
                 observeDownloadList(listAdapter, it)
             }
         }
diff --git a/app/src/main/java/foundation/e/apps/applicationlist/ApplicationListRVAdapter.kt b/app/src/main/java/foundation/e/apps/applicationlist/ApplicationListRVAdapter.kt
index a6daaca27c4c5edd6ae1787ff4efc49004004fda..498fa3733fa349e95b3225218f2bc80125252681 100644
--- a/app/src/main/java/foundation/e/apps/applicationlist/ApplicationListRVAdapter.kt
+++ b/app/src/main/java/foundation/e/apps/applicationlist/ApplicationListRVAdapter.kt
@@ -53,6 +53,7 @@ import foundation.e.apps.utils.enums.Origin
 import foundation.e.apps.utils.enums.Status
 import foundation.e.apps.utils.enums.User
 import javax.inject.Singleton
+import timber.log.Timber
 
 @Singleton
 class ApplicationListRVAdapter(
@@ -281,6 +282,9 @@ class ApplicationListRVAdapter(
             Status.INSTALLATION_ISSUE -> {
                 handleInstallationIssue(view, searchApp)
             }
+            else -> {
+                Timber.w("ApplicationListRVAdapter: Unknown status")
+            }
         }
     }
 
diff --git a/app/src/main/java/foundation/e/apps/applicationlist/ApplicationListViewModel.kt b/app/src/main/java/foundation/e/apps/applicationlist/ApplicationListViewModel.kt
index d3045d9194241b0df69d6f406d0dcaa4af786a89..7eb43ebe43d0db663822cf4c83dabf389600fc19 100644
--- a/app/src/main/java/foundation/e/apps/applicationlist/ApplicationListViewModel.kt
+++ b/app/src/main/java/foundation/e/apps/applicationlist/ApplicationListViewModel.kt
@@ -38,7 +38,7 @@ class ApplicationListViewModel @Inject constructor(
     private val fusedAPIRepository: FusedAPIRepository
 ) : LoadingViewModel() {
 
-    val appListLiveData: MutableLiveData<ResultSupreme<List<FusedApp>>> = MutableLiveData()
+    val appListLiveData: MutableLiveData<ResultSupreme<List<FusedApp>>?> = MutableLiveData()
 
     var isLoading = false
 
@@ -118,7 +118,7 @@ class ApplicationListViewModel @Inject constructor(
             isLoading = true
             val result = fusedAPIRepository.loadMore(authData, browseUrl)
             isLoading = false
-            appListLiveData.postValue(result.first!!)
+            appListLiveData.postValue(result.first)
             /*
              * Check if a placeholder app is to be added at the end.
              * If yes then post the updated result.
@@ -127,7 +127,7 @@ class ApplicationListViewModel @Inject constructor(
              * list, and none at the middle of the list.
              */
             if (fusedAPIRepository.addPlaceHolderAppIfNeeded(result.first)) {
-                appListLiveData.postValue(result.first!!)
+                appListLiveData.postValue(result.first)
             }
 
             /*
diff --git a/app/src/main/java/foundation/e/apps/home/model/HomeChildRVAdapter.kt b/app/src/main/java/foundation/e/apps/home/model/HomeChildRVAdapter.kt
index 5eecedc3cf95959316df22ee443923b9d6a98d52..8cf88f29c8abbfc77bc74264db8f92b46f239a5f 100644
--- a/app/src/main/java/foundation/e/apps/home/model/HomeChildRVAdapter.kt
+++ b/app/src/main/java/foundation/e/apps/home/model/HomeChildRVAdapter.kt
@@ -77,7 +77,6 @@ class HomeChildRVAdapter(
     }
 
     override fun onBindViewHolder(holder: ViewHolder, position: Int) {
-        val view = holder.itemView
         val homeApp = getItem(position)
         val shimmerDrawable = ShimmerDrawable().apply { setShimmer(shimmer) }
 
@@ -104,37 +103,37 @@ class HomeChildRVAdapter(
 
             when (homeApp.status) {
                 Status.INSTALLED -> {
-                    handleInstalled(view, homeApp)
+                    handleInstalled(homeApp)
                 }
                 Status.UPDATABLE -> {
-                    handleUpdatable(view, homeApp)
+                    handleUpdatable(homeApp)
                 }
                 Status.UNAVAILABLE -> {
                     handleUnavailable(homeApp, holder)
                 }
                 Status.QUEUED, Status.AWAITING, Status.DOWNLOADING, Status.DOWNLOADED -> {
-                    handleQueued(view, homeApp)
+                    handleQueued(homeApp)
                 }
                 Status.INSTALLING -> {
                     handleInstalling()
                 }
                 Status.BLOCKED -> {
-                    handleBlocked(view)
+                    handleBlocked()
                 }
                 Status.INSTALLATION_ISSUE -> {
-                    handleInstallationIssue(view, homeApp)
+                    handleInstallationIssue(homeApp)
                 }
+                else -> {}
             }
         }
     }
 
     private fun HomeChildListItemBinding.handleInstallationIssue(
-        view: View,
         homeApp: FusedApp
     ) {
         installButton.apply {
             enableInstallButton()
-            text = view.context.getString(R.string.retry)
+            text = context.getString(R.string.retry)
             setOnClickListener {
                 installApplication(homeApp, appIcon)
             }
@@ -142,7 +141,8 @@ class HomeChildRVAdapter(
         progressBarInstall.visibility = View.GONE
     }
 
-    private fun HomeChildListItemBinding.handleBlocked(view: View) {
+    private fun HomeChildListItemBinding.handleBlocked() {
+        val view = this.root
         installButton.enableInstallButton()
         installButton.setOnClickListener {
             val errorMsg = when (mainActivityViewModel.getUser()) {
@@ -167,7 +167,6 @@ class HomeChildRVAdapter(
     }
 
     private fun HomeChildListItemBinding.handleQueued(
-        view: View,
         homeApp: FusedApp
     ) {
         installButton.apply {
@@ -175,11 +174,11 @@ class HomeChildRVAdapter(
             text = context.getString(R.string.cancel)
             setTextColor(context.getColor(R.color.colorAccent))
             backgroundTintList = ContextCompat.getColorStateList(
-                view.context,
+                context,
                 android.R.color.transparent
             )
             strokeColor =
-                ContextCompat.getColorStateList(view.context, R.color.colorAccent)
+                ContextCompat.getColorStateList(context, R.color.colorAccent)
 
             setOnClickListener {
                 cancelDownload(homeApp)
@@ -210,7 +209,6 @@ class HomeChildRVAdapter(
     }
 
     private fun HomeChildListItemBinding.handleUpdatable(
-        view: View,
         homeApp: FusedApp
     ) {
         installButton.apply {
@@ -229,7 +227,6 @@ class HomeChildRVAdapter(
     }
 
     private fun HomeChildListItemBinding.handleInstalled(
-        view: View,
         homeApp: FusedApp
     ) {
         installButton.apply {
diff --git a/app/src/main/java/foundation/e/apps/login/LoginDataStore.kt b/app/src/main/java/foundation/e/apps/login/LoginDataStore.kt
index 30f633487c9ae45aa8edb612e41f37db3985ec93..1d544a0f71d010f21b4432931fb55cceed47304a 100644
--- a/app/src/main/java/foundation/e/apps/login/LoginDataStore.kt
+++ b/app/src/main/java/foundation/e/apps/login/LoginDataStore.kt
@@ -149,10 +149,11 @@ class LoginDataStore @Inject constructor(
     fun isGplaySelected() = preferenceManager.getBoolean(PREFERENCE_SHOW_GPLAY, true)
 
     fun setSource(source: String, value: Boolean) {
-        preferenceManager.edit().run {
+        val editor = preferenceManager.edit()
+        editor.run {
             this.putBoolean(source, value)
-            apply()
         }
+        editor.apply()
     }
 
     // Clear data
diff --git a/app/src/main/java/foundation/e/apps/login/api/GoogleLoginApi.kt b/app/src/main/java/foundation/e/apps/login/api/GoogleLoginApi.kt
index 47c7bb19adc31fc3f572dd97c4f11b88e38cbcf3..ffcc455f8f20b36cddc29dcea2a691c700be8e99 100644
--- a/app/src/main/java/foundation/e/apps/login/api/GoogleLoginApi.kt
+++ b/app/src/main/java/foundation/e/apps/login/api/GoogleLoginApi.kt
@@ -43,7 +43,7 @@ class GoogleLoginApi(
      * Issue: https://gitlab.e.foundation/e/backlog/-/issues/5680
      */
     suspend fun getAC2DMResponse(email: String, oauthToken: String): PlayResponse {
-        var response = PlayResponse()
+        var response: PlayResponse
         withContext(Dispatchers.IO) {
             response = aC2DMTask.getAC2DMResponse(email, oauthToken)
         }
@@ -55,7 +55,7 @@ class GoogleLoginApi(
      * Issue: https://gitlab.e.foundation/e/backlog/-/issues/5680
      */
     override suspend fun fetchAuthData(email: String, aasToken: String): AuthData? {
-        var authData: AuthData? = null
+        var authData: AuthData?
         withContext(Dispatchers.IO) {
             authData = AuthHelper.build(email, aasToken, nativeDeviceProperty)
         }
diff --git a/app/src/main/java/foundation/e/apps/manager/fused/FileManager.kt b/app/src/main/java/foundation/e/apps/manager/fused/FileManager.kt
index 43b57cb58af3d542fab13f0a4f1b3e5148ecb6e4..209d770523bb65dc869f2945c78861517ec039cb 100644
--- a/app/src/main/java/foundation/e/apps/manager/fused/FileManager.kt
+++ b/app/src/main/java/foundation/e/apps/manager/fused/FileManager.kt
@@ -38,9 +38,7 @@ object FileManager {
             Timber.e(e.stackTraceToString())
         } finally {
             inputStream?.close()
-            inputStream = null
             outputStream?.close()
-            outputStream = null
         }
     }
 }
diff --git a/app/src/main/java/foundation/e/apps/manager/pkg/InstallerService.kt b/app/src/main/java/foundation/e/apps/manager/pkg/InstallerService.kt
index 15543d16d609736f6304fc915195a437a9cc9afa..9a5f65cf8f8e50c667cc1a0a7c2428b1d604494e 100644
--- a/app/src/main/java/foundation/e/apps/manager/pkg/InstallerService.kt
+++ b/app/src/main/java/foundation/e/apps/manager/pkg/InstallerService.kt
@@ -36,6 +36,7 @@ import kotlinx.coroutines.MainScope
 import kotlinx.coroutines.launch
 import timber.log.Timber
 import javax.inject.Inject
+import kotlinx.coroutines.DelicateCoroutinesApi
 
 @AndroidEntryPoint
 class InstallerService : Service() {
@@ -105,6 +106,7 @@ class InstallerService : Service() {
         return null
     }
 
+    @OptIn(DelicateCoroutinesApi::class)
     private fun updateDownloadStatus(pkgName: String) {
         if (pkgName.isEmpty()) {
             Timber.d("updateDownloadStatus: package name should not be empty!")
@@ -116,6 +118,7 @@ class InstallerService : Service() {
         }
     }
 
+    @OptIn(DelicateCoroutinesApi::class)
     private fun updateInstallationIssue(pkgName: String) {
         if (pkgName.isEmpty()) {
             Timber.d("updateDownloadStatus: package name should not be empty!")
diff --git a/app/src/main/java/foundation/e/apps/manager/workmanager/InstallAppWorker.kt b/app/src/main/java/foundation/e/apps/manager/workmanager/InstallAppWorker.kt
index fd7f68da56426aa375c95de4a5061e1f3abf75e6..e3ba92e4bbee7eb4c48fbbb35cc5170728cda084 100644
--- a/app/src/main/java/foundation/e/apps/manager/workmanager/InstallAppWorker.kt
+++ b/app/src/main/java/foundation/e/apps/manager/workmanager/InstallAppWorker.kt
@@ -106,7 +106,7 @@ class InstallAppWorker @AssistedInject constructor(
                     packageManagerModule.isInstalled(it.packageName)
 
                 if (!fusedDownload.isAppInstalling()) {
-                    return Result.success()
+                    return@let
                 }
 
                 setForeground(
@@ -130,8 +130,8 @@ class InstallAppWorker @AssistedInject constructor(
             }
         } finally {
             Timber.i("doWork: RESULT SUCCESS: ${fusedDownload?.name}")
-            return Result.success()
         }
+        return Result.success()
     }
 
     private suspend fun InstallAppWorker.checkUpdateWork(
diff --git a/app/src/main/java/foundation/e/apps/search/SearchFragment.kt b/app/src/main/java/foundation/e/apps/search/SearchFragment.kt
index e995e3e5a31705ddd8fac0ddf73dbed83955a04f..f88407c97fbb7935be3b114c93fc5faebef9d5de 100644
--- a/app/src/main/java/foundation/e/apps/search/SearchFragment.kt
+++ b/app/src/main/java/foundation/e/apps/search/SearchFragment.kt
@@ -25,6 +25,7 @@ import android.os.Bundle
 import android.provider.BaseColumns
 import android.view.View
 import android.view.inputmethod.InputMethodManager
+import android.widget.EditText
 import android.widget.ImageView
 import android.widget.LinearLayout
 import androidx.appcompat.app.AlertDialog
@@ -430,9 +431,13 @@ class SearchFragment :
     }
 
     private fun showKeyboard() {
-        val imm =
-            requireContext().getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
-        imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY)
+        val inputMethodManager = requireContext().getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
+        searchView?.javaClass?.getDeclaredField("mSearchSrcTextView")?.runCatching {
+            isAccessible = true
+            get(searchView)as EditText
+        }?.onSuccess {
+            inputMethodManager.showSoftInput(it, InputMethodManager.SHOW_FORCED)
+        }
     }
 
     private fun populateSuggestionsAdapter(suggestions: List<SearchSuggestEntry>?) {
diff --git a/app/src/main/java/foundation/e/apps/settings/LongPressPreference.kt b/app/src/main/java/foundation/e/apps/settings/LongPressPreference.kt
index c25fec2dfe3032310cce63fbde6484da457f82a9..14b4b592e57e74fd3a33ba81c5d910fc571efce7 100644
--- a/app/src/main/java/foundation/e/apps/settings/LongPressPreference.kt
+++ b/app/src/main/java/foundation/e/apps/settings/LongPressPreference.kt
@@ -29,7 +29,7 @@ import androidx.preference.PreferenceViewHolder
  */
 class LongPressPreference : Preference {
 
-    private var longClickListener: View.OnLongClickListener = View.OnLongClickListener { v -> true }
+    private var longClickListener: View.OnLongClickListener? = null
 
     constructor(context: Context, attrs: AttributeSet, defStyle: Int) : super(
         context,
diff --git a/app/src/main/java/foundation/e/apps/splitinstall/SplitInstallBinder.kt b/app/src/main/java/foundation/e/apps/splitinstall/SplitInstallBinder.kt
index c6df4de3cce3f38566ce0e05a79549cd80eb914b..f6783a5e584b7a1701c677020d23885bbaf27fdb 100644
--- a/app/src/main/java/foundation/e/apps/splitinstall/SplitInstallBinder.kt
+++ b/app/src/main/java/foundation/e/apps/splitinstall/SplitInstallBinder.kt
@@ -19,6 +19,7 @@
 package foundation.e.apps.splitinstall
 
 import android.content.Context
+import androidx.core.content.pm.PackageInfoCompat
 import com.aurora.gplayapi.data.models.AuthData
 import foundation.e.apps.ISplitInstallService
 import foundation.e.apps.api.DownloadManager
@@ -86,8 +87,9 @@ class SplitInstallBinder(
     }
 
     private fun getPackageVersionCode(packageName: String): Int {
-        val applicationInfo = context.packageManager.getPackageInfo(packageName, 0)
-        return applicationInfo.versionCode
+        val packageInfo = context.packageManager.getPackageInfo(packageName, 0)
+        val longVersionCode = PackageInfoCompat.getLongVersionCode(packageInfo)
+        return longVersionCode.toInt()
     }
 
     private suspend fun fetchModuleUrl(
diff --git a/app/src/main/java/foundation/e/apps/updates/manager/UpdatesWorker.kt b/app/src/main/java/foundation/e/apps/updates/manager/UpdatesWorker.kt
index 9d0bec750c9d74fb53de052dcf5684db0a29b924..979fb95dc4af93dd2bfba3cebc95eff98ffa0367 100644
--- a/app/src/main/java/foundation/e/apps/updates/manager/UpdatesWorker.kt
+++ b/app/src/main/java/foundation/e/apps/updates/manager/UpdatesWorker.kt
@@ -108,7 +108,6 @@ class UpdatesWorker @AssistedInject constructor(
             /*
              * If user in UNAVAILABLE, don't do anything.
              */
-            resultStatus = ResultStatus.OK
             Timber.w("User is not available! User is required during update!")
             return
         }
diff --git a/app/src/main/res/layout/fragment_application.xml b/app/src/main/res/layout/fragment_application.xml
index 62958a2a393623ae3426cf99da30b138ada0be89..e2c467ad64da72ed1cd9722f0b6fbe699d83abc5 100644
--- a/app/src/main/res/layout/fragment_application.xml
+++ b/app/src/main/res/layout/fragment_application.xml
@@ -82,7 +82,7 @@
                             android:layout_marginRight="10dp"
                             android:gravity="center_vertical"
                             android:textColor="@android:color/white"
-                            android:drawableLeft="@drawable/ic_warning_white"
+                            app:drawableLeftCompat="@drawable/ic_warning_white"
                             android:drawablePadding="15dp"
                             android:text="@string/this_app_may_not_work_properly" />
                     </RelativeLayout>
@@ -111,7 +111,7 @@
                             android:layout_marginLeft="10dp"
                             android:layout_marginRight="10dp"
                             android:gravity="center"
-                            android:drawableEnd="@drawable/ic_warning_black"
+                            app:drawableEndCompat="@drawable/ic_warning_black"
                             android:drawablePadding="15dp"
                             android:textColor="?android:textColorPrimary"
                             android:text="@string/why_open_source_version" />
diff --git a/lint.xml b/lint.xml
index 1e93dd895f77bdac7f5ca649d0510401cb9fac2a..f272eed7caede752c3c7423ddb67b1f164870b33 100644
--- a/lint.xml
+++ b/lint.xml
@@ -10,7 +10,7 @@
     <issue id="SdCardPath" severity="warning" />
     <issue id="VectorRaster" severity="warning" />
 
-    <!-- Others are considered as error -->
-    <issue id="all" severity="error" />
+    <!-- Others are considered as warnings -->
+    <issue id="all" severity="warning" />
 </lint>