fix: process death resilience and account for android 11 bug (#2355)

app/src/main/java/app/revanced/manager/ManagerApplication.kt

@@ -1,10 +1,15 @@
 package app.revanced.manager
 
+import android.app.Activity
 import android.app.Application
+import android.os.Bundle
+import android.util.Log
+import app.revanced.manager.data.platform.Filesystem
 import app.revanced.manager.di.*
 import app.revanced.manager.domain.manager.PreferencesManager
 import app.revanced.manager.domain.repository.DownloaderPluginRepository
 import app.revanced.manager.domain.repository.PatchBundleRepository
+import app.revanced.manager.util.tag
 import kotlinx.coroutines.Dispatchers
 import coil.Coil
 import coil.ImageLoader
@@ -25,6 +30,7 @@ class ManagerApplication : Application() {
     private val prefs: PreferencesManager by inject()
     private val patchBundleRepository: PatchBundleRepository by inject()
     private val downloaderPluginRepository: DownloaderPluginRepository by inject()
+    private val fs: Filesystem by inject()
 
     override fun onCreate() {
         super.onCreate()
@@ -71,5 +77,34 @@ class ManagerApplication : Application() {
                 updateCheck()
             }
         }
+        registerActivityLifecycleCallbacks(object : ActivityLifecycleCallbacks {
+            private var firstActivityCreated = false
+
+            override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
+                if (firstActivityCreated) return
+                firstActivityCreated = true
+
+                // We do not want to call onFreshProcessStart() if there is state to restore.
+                // This can happen on system-initiated process death.
+                if (savedInstanceState == null) {
+                    Log.d(tag, "Fresh process created")
+                    onFreshProcessStart()
+                } else Log.d(tag, "System-initiated process death detected")
+            }
+
+            override fun onActivityStarted(activity: Activity) {}
+            override fun onActivityResumed(activity: Activity) {}
+            override fun onActivityPaused(activity: Activity) {}
+            override fun onActivityStopped(activity: Activity) {}
+            override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) {}
+            override fun onActivityDestroyed(activity: Activity) {}
+        })
+    }
+
+    private fun onFreshProcessStart() {
+        fs.uiTempDir.apply {
+            deleteRecursively()
+            mkdirs()
+        }
     }
 }

app/src/main/java/app/revanced/manager/data/platform/Filesystem.kt

@@ -9,6 +9,8 @@ import android.os.Environment
 import androidx.activity.result.contract.ActivityResultContract
 import androidx.activity.result.contract.ActivityResultContracts
 import app.revanced.manager.util.RequestManageStorageContract
+import java.io.File
+import java.nio.file.Path
 
 class Filesystem(private val app: Application) {
     val contentResolver = app.contentResolver // TODO: move Content Resolver operations to here.
@@ -17,21 +19,33 @@ class Filesystem(private val app: Application) {
      * A directory that gets cleared when the app restarts.
      * Do not store paths to this directory in a parcel.
      */
-    val tempDir = app.getDir("ephemeral", Context.MODE_PRIVATE).apply {
+    val tempDir: File = app.getDir("ephemeral", Context.MODE_PRIVATE).apply {
         deleteRecursively()
         mkdirs()
     }
 
-    fun externalFilesDir() = Environment.getExternalStorageDirectory().toPath()
+    /**
+     * A directory for storing temporary files related to UI.
+     * This is the same as [tempDir], but does not get cleared on system-initiated process death.
+     * Paths to this directory can be safely stored in parcels.
+     */
+    val uiTempDir: File = app.getDir("ui_ephemeral", Context.MODE_PRIVATE)
+
+    fun externalFilesDir(): Path = Environment.getExternalStorageDirectory().toPath()
 
     private fun usesManagePermission() = Build.VERSION.SDK_INT >= Build.VERSION_CODES.R
 
-    private val storagePermissionName = if (usesManagePermission()) Manifest.permission.MANAGE_EXTERNAL_STORAGE else Manifest.permission.READ_EXTERNAL_STORAGE
+    private val storagePermissionName =
+        if (usesManagePermission()) Manifest.permission.MANAGE_EXTERNAL_STORAGE else Manifest.permission.READ_EXTERNAL_STORAGE
 
     fun permissionContract(): Pair<ActivityResultContract<String, Boolean>, String> {
-        val contract = if (usesManagePermission()) RequestManageStorageContract() else ActivityResultContracts.RequestPermission()
+        val contract =
+            if (usesManagePermission()) RequestManageStorageContract() else ActivityResultContracts.RequestPermission()
         return contract to storagePermissionName
     }
 
-    fun hasStoragePermission() = if (usesManagePermission()) Environment.isExternalStorageManager() else app.checkSelfPermission(storagePermissionName) == PackageManager.PERMISSION_GRANTED
+    fun hasStoragePermission() =
+        if (usesManagePermission()) Environment.isExternalStorageManager() else app.checkSelfPermission(
+            storagePermissionName
+        ) == PackageManager.PERMISSION_GRANTED
 }

app/src/main/java/app/revanced/manager/patcher/Session.kt

@@ -25,7 +25,7 @@ class Session(
     private val androidContext: Context,
     private val logger: Logger,
     private val input: File,
-    private val onPatchCompleted: () -> Unit,
+    private val onPatchCompleted: suspend () -> Unit,
     private val onProgress: (name: String?, state: State?, message: String?) -> Unit
 ) : Closeable {
     private fun updateProgress(name: String? = null, state: State? = null, message: String? = null) =

app/src/main/java/app/revanced/manager/patcher/runtime/CoroutineRuntime.kt

@@ -20,7 +20,7 @@ class CoroutineRuntime(private val context: Context) : Runtime(context) {
         selectedPatches: PatchSelection,
         options: Options,
         logger: Logger,
-        onPatchCompleted: () -> Unit,
+        onPatchCompleted: suspend () -> Unit,
         onProgress: ProgressEventHandler,
     ) {
         val bundles = bundles()

app/src/main/java/app/revanced/manager/patcher/runtime/ProcessRuntime.kt

@@ -66,7 +66,7 @@ class ProcessRuntime(private val context: Context) : Runtime(context) {
         selectedPatches: PatchSelection,
         options: Options,
         logger: Logger,
-        onPatchCompleted: () -> Unit,
+        onPatchCompleted: suspend () -> Unit,
         onProgress: ProgressEventHandler,
     ) = coroutineScope {
         // Get the location of our own Apk.
@@ -123,7 +123,9 @@ class ProcessRuntime(private val context: Context) : Runtime(context) {
             val eventHandler = object : IPatcherEvents.Stub() {
                 override fun log(level: String, msg: String) = logger.log(enumValueOf(level), msg)
 
-                override fun patchSucceeded() = onPatchCompleted()
+                override fun patchSucceeded() {
+                    launch { onPatchCompleted() }
+                }
 
                 override fun progress(name: String?, state: String?, msg: String?) =
                     onProgress(name, state?.let { enumValueOf<State>(it) }, msg)

app/src/main/java/app/revanced/manager/patcher/runtime/Runtime.kt

@@ -34,7 +34,7 @@ sealed class Runtime(context: Context) : KoinComponent {
         selectedPatches: PatchSelection,
         options: Options,
         logger: Logger,
-        onPatchCompleted: () -> Unit,
+        onPatchCompleted: suspend () -> Unit,
         onProgress: ProgressEventHandler,
     )
 }

app/src/main/java/app/revanced/manager/patcher/worker/PatcherWorker.kt

@@ -42,9 +42,7 @@ import app.revanced.manager.util.PM
 import app.revanced.manager.util.PatchSelection
 import app.revanced.manager.util.tag
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.first
-import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.withContext
 import org.koin.core.component.KoinComponent
 import org.koin.core.component.inject
@@ -73,10 +71,10 @@ class PatcherWorker(
         val selectedPatches: PatchSelection,
         val options: Options,
         val logger: Logger,
-        val downloadProgress: MutableStateFlow<Pair<Long, Long?>?>,
+        val onDownloadProgress: suspend (Pair<Long, Long?>?) -> Unit,
-        val patchesProgress: MutableStateFlow<Pair<Int, Int>>,
+        val onPatchCompleted: suspend () -> Unit,
         val handleStartActivityRequest: suspend (LoadedDownloaderPlugin, Intent) -> ActivityResult,
-        val setInputFile: (File) -> Unit,
+        val setInputFile: suspend (File) -> Unit,
         val onProgress: ProgressEventHandler
     ) {
         val packageName get() = input.packageName
@@ -160,7 +158,7 @@ class PatcherWorker(
                     data,
                     args.packageName,
                     args.input.version,
-                    onDownload = args.downloadProgress::emit
+                    onDownload = args.onDownloadProgress
                 ).also {
                     args.setInputFile(it)
                     updateProgress(state = State.COMPLETED) // Download APK
@@ -224,11 +222,7 @@ class PatcherWorker(
                 args.selectedPatches,
                 args.options,
                 args.logger,
-                onPatchCompleted = {
+                args.onPatchCompleted,
-                    args.patchesProgress.update { (completed, total) ->
-                        completed + 1 to total
-                    }
-                },
                 args.onProgress
             )
 

app/src/main/java/app/revanced/manager/ui/component/InstallerStatusDialog.kt

@@ -6,7 +6,6 @@ import androidx.annotation.StringRes
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.outlined.Check
 import androidx.compose.material.icons.outlined.ErrorOutline
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.Icon
@@ -21,35 +20,25 @@ import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import app.revanced.manager.R
+import app.revanced.manager.ui.model.InstallerModel
 import com.github.materiiapps.enumutil.FromValue
 
 private typealias InstallerStatusDialogButtonHandler = ((model: InstallerModel) -> Unit)
-private typealias InstallerStatusDialogButton = @Composable (model: InstallerStatusDialogModel) -> Unit
+private typealias InstallerStatusDialogButton = @Composable (model: InstallerModel, dismiss: () -> Unit) -> Unit
-
-interface InstallerModel {
-    fun reinstall()
-    fun install()
-}
-
-interface InstallerStatusDialogModel : InstallerModel {
-    var packageInstallerStatus: Int?
-}
 
 @Composable
-fun InstallerStatusDialog(model: InstallerStatusDialogModel) {
+fun InstallerStatusDialog(installerStatus: Int, model: InstallerModel, onDismiss: () -> Unit) {
     val dialogKind = remember {
-        DialogKind.fromValue(model.packageInstallerStatus!!) ?: DialogKind.FAILURE
+        DialogKind.fromValue(installerStatus) ?: DialogKind.FAILURE
     }
 
     AlertDialog(
-        onDismissRequest = {
+        onDismissRequest = onDismiss,
-            model.packageInstallerStatus = null
-        },
         confirmButton = {
-            dialogKind.confirmButton(model)
+            dialogKind.confirmButton(model, onDismiss)
         },
         dismissButton = {
-            dialogKind.dismissButton?.invoke(model)
+            dialogKind.dismissButton?.invoke(model, onDismiss)
         },
         icon = {
             Icon(dialogKind.icon, null)
@@ -75,10 +64,10 @@ fun InstallerStatusDialog(model: InstallerStatusDialogModel) {
 private fun installerStatusDialogButton(
     @StringRes buttonStringResId: Int,
     buttonHandler: InstallerStatusDialogButtonHandler = { },
-): InstallerStatusDialogButton = { model ->
+): InstallerStatusDialogButton = { model, dismiss ->
     TextButton(
         onClick = {
-            model.packageInstallerStatus = null
+            dismiss()
             buttonHandler(model)
         }
     ) {
@@ -154,6 +143,7 @@ enum class DialogKind(
             model.install()
         },
     );
+
     // Needed due to the @FromValue annotation.
     companion object
 }

app/src/main/java/app/revanced/manager/ui/component/patcher/Steps.kt

@@ -36,13 +36,14 @@ import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
-import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import app.revanced.manager.R
 import app.revanced.manager.ui.component.ArrowButton
 import app.revanced.manager.ui.component.LoadingIndicator
+import app.revanced.manager.ui.model.ProgressKey
 import app.revanced.manager.ui.model.State
 import app.revanced.manager.ui.model.Step
 import app.revanced.manager.ui.model.StepCategory
+import app.revanced.manager.ui.model.StepProgressProvider
 import java.util.Locale
 import kotlin.math.floor
 
@@ -52,6 +53,7 @@ fun Steps(
     category: StepCategory,
     steps: List<Step>,
     stepCount: Pair<Int, Int>? = null,
+    stepProgressProvider: StepProgressProvider
 ) {
     var expanded by rememberSaveable { mutableStateOf(true) }
 
@@ -116,13 +118,20 @@ fun Steps(
                 modifier = Modifier.fillMaxWidth()
             ) {
                 steps.forEach { step ->
-                    val downloadProgress = step.downloadProgress?.collectAsStateWithLifecycle()
+                    val (progress, progressText) = when (step.progressKey) {
+                        null -> null
+                        ProgressKey.DOWNLOAD -> stepProgressProvider.downloadProgress?.let { (downloaded, total) ->
+                            if (total != null) downloaded.toFloat() / total.toFloat() to "${downloaded.megaBytes}/${total.megaBytes} MB"
+                            else null to "${downloaded.megaBytes} MB"
+                        }
+                    } ?: (null to null)
 
                     SubStep(
                         name = step.name,
                         state = step.state,
                         message = step.message,
-                        downloadProgress = downloadProgress?.value
+                        progress = progress,
+                        progressText = progressText
                     )
                 }
             }
@@ -135,7 +144,8 @@ fun SubStep(
     name: String,
     state: State,
     message: String? = null,
-    downloadProgress: Pair<Long, Long?>? = null
+    progress: Float? = null,
+    progressText: String? = null
 ) {
     var messageExpanded by rememberSaveable { mutableStateOf(true) }
 
@@ -156,7 +166,7 @@ fun SubStep(
                 modifier = Modifier.size(24.dp),
                 contentAlignment = Alignment.Center
             ) {
-                StepIcon(state, downloadProgress, size = 20.dp)
+                StepIcon(state, progress, size = 20.dp)
             }
 
             Text(
@@ -167,8 +177,8 @@ fun SubStep(
                 modifier = Modifier.weight(1f, true),
             )
 
-            if (message != null) {
+            when {
-                Box(
+                message != null -> Box(
                     modifier = Modifier.size(24.dp),
                     contentAlignment = Alignment.Center
                 ) {
@@ -178,15 +188,13 @@ fun SubStep(
                         onClick = null
                     )
                 }
-            } else {
+
-                downloadProgress?.let { (current, total) ->
+                progressText != null -> Text(
-                    Text(
+                    progressText,
-                        if (total != null) "${current.megaBytes}/${total.megaBytes} MB" else "${current.megaBytes} MB",
                     style = MaterialTheme.typography.labelSmall
                 )
             }
         }
-        }
 
         AnimatedVisibility(visible = messageExpanded && message != null) {
             Text(
@@ -200,7 +208,7 @@ fun SubStep(
 }
 
 @Composable
-fun StepIcon(state: State, progress: Pair<Long, Long?>? = null, size: Dp) {
+fun StepIcon(state: State, progress: Float? = null, size: Dp) {
     val strokeWidth = Dp(floor(size.value / 10) + 1)
 
     when (state) {
@@ -234,12 +242,7 @@ fun StepIcon(state: State, progress: Pair<Long, Long?>? = null, size: Dp) {
                             contentDescription = description
                         }
                 },
-                progress = {
+                progress = { progress },
-                    progress?.let { (current, total) ->
-                        if (total == null) return@let null
-                        current / total
-                    }?.toFloat()
-                },
                 strokeWidth = strokeWidth
             )
     }

app/src/main/java/app/revanced/manager/ui/model/InstallerModel.kt

@@ -0,0 +1,6 @@
+package app.revanced.manager.ui.model
+
+interface InstallerModel {
+    fun reinstall()
+    fun install()
+}

app/src/main/java/app/revanced/manager/ui/model/PatcherStep.kt

@@ -1,8 +1,9 @@
 package app.revanced.manager.ui.model
 
+import android.os.Parcelable
 import androidx.annotation.StringRes
 import app.revanced.manager.R
-import kotlinx.coroutines.flow.StateFlow
+import kotlinx.parcelize.Parcelize
 
 enum class StepCategory(@StringRes val displayName: Int) {
     PREPARING(R.string.patcher_step_group_preparing),
@@ -14,10 +15,19 @@ enum class State {
     WAITING, RUNNING, FAILED, COMPLETED
 }
 
+enum class ProgressKey {
+    DOWNLOAD
+}
+
+interface StepProgressProvider {
+    val downloadProgress: Pair<Long, Long?>?
+}
+
+@Parcelize
 data class Step(
     val name: String,
     val category: StepCategory,
     val state: State = State.WAITING,
     val message: String? = null,
-    val downloadProgress: StateFlow<Pair<Long, Long?>?>? = null
+    val progressKey: ProgressKey? = null
-)
+) : Parcelable

app/src/main/java/app/revanced/manager/ui/screen/DashboardScreen.kt

@@ -5,6 +5,7 @@ import android.content.Intent
 import android.net.Uri
 import android.provider.Settings
 import androidx.activity.compose.BackHandler
+import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.pager.HorizontalPager
@@ -27,6 +28,7 @@ import app.revanced.manager.R
 import app.revanced.manager.data.room.apps.installed.InstalledApp
 import app.revanced.manager.domain.bundles.PatchBundleSource.Extensions.isDefault
 import app.revanced.manager.patcher.aapt.Aapt
+import app.revanced.manager.ui.component.AlertDialogExtended
 import app.revanced.manager.ui.component.AppTopBar
 import app.revanced.manager.ui.component.AutoUpdatesDialog
 import app.revanced.manager.ui.component.AvailableUpdateDialog
@@ -36,6 +38,7 @@ import app.revanced.manager.ui.component.haptics.HapticFloatingActionButton
 import app.revanced.manager.ui.component.haptics.HapticTab
 import app.revanced.manager.ui.component.bundle.ImportPatchBundleDialog
 import app.revanced.manager.ui.viewmodel.DashboardViewModel
+import app.revanced.manager.util.RequestInstallAppsContract
 import app.revanced.manager.util.toast
 import kotlinx.coroutines.launch
 import org.koin.androidx.compose.koinViewModel
@@ -93,20 +96,36 @@ fun DashboardScreen(
         )
     }
 
-    var showDialog by rememberSaveable { mutableStateOf(vm.prefs.showManagerUpdateDialogOnLaunch.getBlocking()) }
+    var showUpdateDialog by rememberSaveable { mutableStateOf(vm.prefs.showManagerUpdateDialogOnLaunch.getBlocking()) }
     val availableUpdate by remember {
-        derivedStateOf { vm.updatedManagerVersion.takeIf { showDialog } }
+        derivedStateOf { vm.updatedManagerVersion.takeIf { showUpdateDialog } }
     }
 
     availableUpdate?.let { version ->
         AvailableUpdateDialog(
-            onDismiss = { showDialog = false },
+            onDismiss = { showUpdateDialog = false },
             setShowManagerUpdateDialogOnLaunch = vm::setShowManagerUpdateDialogOnLaunch,
             onConfirm = onUpdateClick,
             newVersion = version
         )
     }
 
+    val context = LocalContext.current
+    var showAndroid11Dialog by rememberSaveable { mutableStateOf(false) }
+    val installAppsPermissionLauncher =
+        rememberLauncherForActivityResult(RequestInstallAppsContract) { granted ->
+            showAndroid11Dialog = false
+            if (granted) onAppSelectorClick()
+        }
+    if (showAndroid11Dialog) Android11Dialog(
+        onDismissRequest = {
+            showAndroid11Dialog = false
+        },
+        onContinue = {
+            installAppsPermissionLauncher.launch(context.packageName)
+        }
+    )
+
     Scaffold(
         topBar = {
             if (bundlesSelectable) {
@@ -188,6 +207,10 @@ fun DashboardScreen(
                                 }
                                 return@HapticFloatingActionButton
                             }
+                            if (vm.android11BugActive) {
+                                showAndroid11Dialog = true
+                                return@HapticFloatingActionButton
+                            }
 
                             onAppSelectorClick()
                         }
@@ -317,3 +340,24 @@ fun Notifications(
         }
     }
 }
+
+@Composable
+fun Android11Dialog(onDismissRequest: () -> Unit, onContinue: () -> Unit) {
+    AlertDialogExtended(
+        onDismissRequest = onDismissRequest,
+        confirmButton = {
+            TextButton(onClick = onContinue) {
+                Text(stringResource(R.string.continue_))
+            }
+        },
+        title = {
+            Text(stringResource(R.string.android_11_bug_dialog_title))
+        },
+        icon = {
+            Icon(Icons.Outlined.BugReport, null)
+        },
+        text = {
+            Text(stringResource(R.string.android_11_bug_dialog_description))
+        }
+    )
+}

app/src/main/java/app/revanced/manager/ui/screen/PatcherScreen.kt

@@ -29,7 +29,6 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
-import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import app.revanced.manager.R
 import app.revanced.manager.data.room.apps.installed.InstallType
 import app.revanced.manager.ui.component.AppScaffold
@@ -38,7 +37,6 @@ import app.revanced.manager.ui.component.InstallerStatusDialog
 import app.revanced.manager.ui.component.haptics.HapticExtendedFloatingActionButton
 import app.revanced.manager.ui.component.patcher.InstallPickerDialog
 import app.revanced.manager.ui.component.patcher.Steps
-import app.revanced.manager.ui.model.State
 import app.revanced.manager.ui.model.StepCategory
 import app.revanced.manager.ui.viewmodel.PatcherViewModel
 import app.revanced.manager.util.APK_MIMETYPE
@@ -50,7 +48,11 @@ fun PatcherScreen(
     onBackClick: () -> Unit,
     vm: PatcherViewModel
 ) {
-    BackHandler(onBack = onBackClick)
+    fun leaveScreen() {
+        vm.onBack()
+        onBackClick()
+    }
+    BackHandler(onBack = ::leaveScreen)
 
     val context = LocalContext.current
     val exportApkLauncher =
@@ -66,22 +68,6 @@ fun PatcherScreen(
         }
     }
 
-    val patchesProgress by vm.patchesProgress.collectAsStateWithLifecycle()
-
-    val progress by remember {
-        derivedStateOf {
-            val (patchesCompleted, patchesTotal) = patchesProgress
-
-            val current = vm.steps.count {
-                it.state == State.COMPLETED && it.category != StepCategory.PATCHING
-            } + patchesCompleted
-
-            val total = vm.steps.size - 1 + patchesTotal
-
-            current.toFloat() / total.toFloat()
-        }
-    }
-
     if (patcherSucceeded == null) {
         DisposableEffect(Unit) {
             val window = (context as Activity).window
@@ -98,8 +84,9 @@ fun PatcherScreen(
             onConfirm = vm::install
         )
 
-    if (vm.installerStatusDialogModel.packageInstallerStatus != null)
+    vm.packageInstallerStatus?.let {
-        InstallerStatusDialog(vm.installerStatusDialogModel)
+        InstallerStatusDialog(it, vm, vm::dismissPackageInstallerDialog)
+    }
 
     val activityLauncher = rememberLauncherForActivityResult(
         contract = ActivityResultContracts.StartActivityForResult(),
@@ -137,7 +124,7 @@ fun PatcherScreen(
         topBar = {
             AppTopBar(
                 title = stringResource(R.string.patcher),
-                onBackClick = onBackClick
+                onBackClick = ::leaveScreen
             )
         },
         bottomBar = {
@@ -193,7 +180,7 @@ fun PatcherScreen(
                 .fillMaxSize()
         ) {
             LinearProgressIndicator(
-                progress = { progress },
+                progress = { vm.progress },
                 modifier = Modifier.fillMaxWidth()
             )
 
@@ -209,7 +196,8 @@ fun PatcherScreen(
                     Steps(
                         category = category,
                         steps = steps,
-                        stepCount = if (category == StepCategory.PATCHING) patchesProgress else null
+                        stepCount = if (category == StepCategory.PATCHING) vm.patchesProgress else null,
+                        stepProgressProvider = vm
                     )
                 }
             }

app/src/main/java/app/revanced/manager/ui/viewmodel/AppSelectorViewModel.kt

@@ -6,9 +6,13 @@ import android.net.Uri
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
+import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import androidx.lifecycle.viewmodel.compose.SavedStateHandleSaveableApi
+import androidx.lifecycle.viewmodel.compose.saveable
 import app.revanced.manager.R
+import app.revanced.manager.data.platform.Filesystem
 import app.revanced.manager.domain.repository.PatchBundleRepository
 import app.revanced.manager.ui.model.SelectedApp
 import app.revanced.manager.util.PM
@@ -22,13 +26,19 @@ import kotlinx.coroutines.withContext
 import java.io.File
 import java.nio.file.Files
 
+@OptIn(SavedStateHandleSaveableApi::class)
 class AppSelectorViewModel(
     private val app: Application,
     private val pm: PM,
-    private val patchBundleRepository: PatchBundleRepository
+    fs: Filesystem,
+    private val patchBundleRepository: PatchBundleRepository,
+    savedStateHandle: SavedStateHandle,
 ) : ViewModel() {
-    private val inputFile = File(app.filesDir, "input.apk").also {
+    private val inputFile = savedStateHandle.saveable(key = "inputFile") {
-        it.delete()
+        File(
+            fs.uiTempDir,
+            "input.apk"
+        ).also(File::delete)
     }
     val appList = pm.appList
 

app/src/main/java/app/revanced/manager/ui/viewmodel/DashboardViewModel.kt

@@ -3,6 +3,7 @@ package app.revanced.manager.ui.viewmodel
 import android.app.Application
 import android.content.ContentResolver
 import android.net.Uri
+import android.os.Build
 import android.os.PowerManager
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateListOf
@@ -20,6 +21,7 @@ import app.revanced.manager.domain.manager.PreferencesManager
 import app.revanced.manager.domain.repository.DownloaderPluginRepository
 import app.revanced.manager.domain.repository.PatchBundleRepository
 import app.revanced.manager.network.api.ReVancedAPI
+import app.revanced.manager.util.PM
 import app.revanced.manager.util.toast
 import app.revanced.manager.util.uiSafe
 import kotlinx.coroutines.flow.first
@@ -32,7 +34,8 @@ class DashboardViewModel(
     private val downloaderPluginRepository: DownloaderPluginRepository,
     private val reVancedAPI: ReVancedAPI,
     private val networkInfo: NetworkInfo,
-    val prefs: PreferencesManager
+    val prefs: PreferencesManager,
+    private val pm: PM,
 ) : ViewModel() {
     val availablePatches =
         patchBundleRepository.bundles.map { it.values.sumOf { bundle -> bundle.patches.size } }
@@ -43,6 +46,14 @@ class DashboardViewModel(
 
     val newDownloaderPluginsAvailable = downloaderPluginRepository.newPluginPackageNames.map { it.isNotEmpty() }
 
+    /**
+     * Android 11 kills the app process after granting the "install apps" permission, which is a problem for the patcher screen.
+     * This value is true when the conditions that trigger the bug are met.
+     *
+     * See: https://github.com/ReVanced/revanced-manager/issues/2138
+     */
+    val android11BugActive get() = Build.VERSION.SDK_INT == Build.VERSION_CODES.R && !pm.canInstallPackages()
+
     var updatedManagerVersion: String? by mutableStateOf(null)
         private set
     var showBatteryOptimizationsWarning by mutableStateOf(false)

app/src/main/java/app/revanced/manager/ui/viewmodel/PatcherViewModel.kt

@@ -7,18 +7,22 @@ import android.content.Intent
 import android.content.IntentFilter
 import android.content.pm.PackageInstaller
 import android.net.Uri
+import android.os.ParcelUuid
 import android.util.Log
 import androidx.activity.result.ActivityResult
-import androidx.compose.runtime.Stable
 import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.autoSaver
 import androidx.compose.runtime.setValue
 import androidx.compose.runtime.toMutableStateList
 import androidx.core.content.ContextCompat
+import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.map
 import androidx.lifecycle.viewModelScope
+import androidx.lifecycle.viewmodel.compose.SavedStateHandleSaveableApi
+import androidx.lifecycle.viewmodel.compose.saveable
 import androidx.work.WorkInfo
 import androidx.work.WorkManager
 import app.revanced.manager.R
@@ -35,13 +39,17 @@ import app.revanced.manager.plugin.downloader.PluginHostApi
 import app.revanced.manager.plugin.downloader.UserInteractionException
 import app.revanced.manager.service.InstallService
 import app.revanced.manager.service.UninstallService
-import app.revanced.manager.ui.component.InstallerStatusDialogModel
 import app.revanced.manager.ui.destination.Destination
+import app.revanced.manager.ui.model.InstallerModel
+import app.revanced.manager.ui.model.ProgressKey
 import app.revanced.manager.ui.model.SelectedApp
 import app.revanced.manager.ui.model.State
 import app.revanced.manager.ui.model.Step
 import app.revanced.manager.ui.model.StepCategory
+import app.revanced.manager.ui.model.StepProgressProvider
 import app.revanced.manager.util.PM
+import app.revanced.manager.util.saveableVar
+import app.revanced.manager.util.saver.snapshotStateListSaver
 import app.revanced.manager.util.simpleMessage
 import app.revanced.manager.util.tag
 import app.revanced.manager.util.toast
@@ -51,68 +59,72 @@ import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.channels.Channel
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.receiveAsFlow
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.time.withTimeout
 import kotlinx.coroutines.withContext
 import org.koin.core.component.KoinComponent
+import org.koin.core.component.get
 import org.koin.core.component.inject
 import java.io.File
 import java.nio.file.Files
 import java.time.Duration
-import java.util.UUID
 
-@Stable
+@OptIn(SavedStateHandleSaveableApi::class, PluginHostApi::class)
-@OptIn(PluginHostApi::class)
 class PatcherViewModel(
     private val input: Destination.Patcher
-) : ViewModel(), KoinComponent {
+) : ViewModel(), KoinComponent, StepProgressProvider, InstallerModel {
     private val app: Application by inject()
     private val fs: Filesystem by inject()
     private val pm: PM by inject()
     private val workerRepository: WorkerRepository by inject()
     private val installedAppRepository: InstalledAppRepository by inject()
     private val rootInstaller: RootInstaller by inject()
-
+    private val savedStateHandle: SavedStateHandle = get()
-    val installerStatusDialogModel: InstallerStatusDialogModel =
-        object : InstallerStatusDialogModel {
-            override var packageInstallerStatus: Int? by mutableStateOf(null)
-
-            override fun reinstall() {
-                this@PatcherViewModel.reinstall()
-            }
-
-            override fun install() {
-                // Since this is a package installer status dialog,
-                // InstallType.MOUNT is never used here.
-                install(InstallType.DEFAULT)
-            }
-        }
 
     private var installedApp: InstalledApp? = null
-    val packageName: String = input.selectedApp.packageName
+    val packageName = input.selectedApp.packageName
-    var installedPackageName by mutableStateOf<String?>(null)
+
+    var installedPackageName by savedStateHandle.saveable(
+        key = "installedPackageName",
+        // Force Kotlin to select the correct overload.
+        stateSaver = autoSaver()
+    ) {
+        mutableStateOf<String?>(null)
+    }
         private set
-    var isInstalling by mutableStateOf(false)
+    private var ongoingPmSession: Boolean by savedStateHandle.saveableVar { false }
+    var packageInstallerStatus: Int? by savedStateHandle.saveable(
+        key = "packageInstallerStatus",
+        stateSaver = autoSaver()
+    ) {
+        mutableStateOf(null)
+    }
         private set
 
-    private var currentActivityRequest: Pair<CompletableDeferred<Boolean>, String>? by mutableStateOf(null)
+    var isInstalling by mutableStateOf(ongoingPmSession)
+        private set
+
+    private var currentActivityRequest: Pair<CompletableDeferred<Boolean>, String>? by mutableStateOf(
+        null
+    )
     val activityPromptDialog by derivedStateOf { currentActivityRequest?.second }
 
     private var launchedActivity: CompletableDeferred<ActivityResult>? = null
     private val launchActivityChannel = Channel<Intent>()
     val launchActivityFlow = launchActivityChannel.receiveAsFlow()
 
-    private val tempDir = fs.tempDir.resolve("installer").also {
+    private val tempDir = savedStateHandle.saveable(key = "tempDir") {
+        fs.uiTempDir.resolve("installer").also {
             it.deleteRecursively()
             it.mkdirs()
         }
-    private var inputFile: File? = null
+    }
+
+    private var inputFile: File? by savedStateHandle.saveableVar()
     private val outputFile = tempDir.resolve("output.apk")
 
-    private val logs = mutableListOf<Pair<LogLevel, String>>()
+    private val logs by savedStateHandle.saveable<MutableList<Pair<LogLevel, String>>> { mutableListOf() }
     private val logger = object : Logger() {
         override fun log(level: LogLevel, message: String) {
             level.androidLog(message)
@@ -124,28 +136,56 @@ class PatcherViewModel(
         }
     }
 
-    val patchesProgress = MutableStateFlow(Pair(0, input.selectedPatches.values.sumOf { it.size }))
+    private val patchCount = input.selectedPatches.values.sumOf { it.size }
-    private val downloadProgress = MutableStateFlow<Pair<Long, Long?>?>(null)
+    private var completedPatchCount by savedStateHandle.saveable {
-    val steps = generateSteps(
+        // SavedStateHandle.saveable only supports the boxed version.
+        @Suppress("AutoboxingStateCreation") mutableStateOf(
+            0
+        )
+    }
+    val patchesProgress get() = completedPatchCount to patchCount
+    override var downloadProgress by savedStateHandle.saveable(
+        key = "downloadProgress",
+        stateSaver = autoSaver()
+    ) {
+        mutableStateOf<Pair<Long, Long?>?>(null)
+    }
+        private set
+    val steps by savedStateHandle.saveable(saver = snapshotStateListSaver()) {
+        generateSteps(
             app,
-        input.selectedApp,
+            input.selectedApp
-        downloadProgress
         ).toMutableStateList()
+    }
     private var currentStepIndex = 0
 
+    val progress by derivedStateOf {
+        val current = steps.count {
+            it.state == State.COMPLETED && it.category != StepCategory.PATCHING
+        } + completedPatchCount
+
+        val total = steps.size - 1 + patchCount
+
+        current.toFloat() / total.toFloat()
+    }
+
     private val workManager = WorkManager.getInstance(app)
 
-    private val patcherWorkerId: UUID =
+    private val patcherWorkerId by savedStateHandle.saveable<ParcelUuid> {
-        workerRepository.launchExpedited<PatcherWorker, PatcherWorker.Args>(
+        ParcelUuid(workerRepository.launchExpedited<PatcherWorker, PatcherWorker.Args>(
             "patching", PatcherWorker.Args(
                 input.selectedApp,
                 outputFile.path,
                 input.selectedPatches,
                 input.options,
                 logger,
-                downloadProgress,
+                onDownloadProgress = {
-                patchesProgress,
+                    withContext(Dispatchers.Main) {
-                setInputFile = { inputFile = it },
+                        downloadProgress = it
+                    }
+                },
+                onPatchCompleted = { withContext(Dispatchers.Main) { completedPatchCount += 1 } },
+                setInputFile = { withContext(Dispatchers.Main) { inputFile = it } },
                 handleStartActivityRequest = { plugin, intent ->
                     withContext(Dispatchers.Main) {
                         if (currentActivityRequest != null) throw Exception("Another request is already pending.")
@@ -192,10 +232,11 @@ class PatcherViewModel(
                     }
                 }
             )
-        )
+        ))
+    }
 
     val patcherSucceeded =
-        workManager.getWorkInfoByIdLiveData(patcherWorkerId).map { workInfo: WorkInfo? ->
+        workManager.getWorkInfoByIdLiveData(patcherWorkerId.uuid).map { workInfo: WorkInfo? ->
             when (workInfo?.state) {
                 WorkInfo.State.SUCCEEDED -> true
                 WorkInfo.State.FAILED -> false
@@ -229,9 +270,7 @@ class PatcherViewModel(
                                 input.selectedPatches
                             )
                         }
-                    }
+                    } else packageInstallerStatus = pmStatus
-
-                    installerStatusDialogModel.packageInstallerStatus = pmStatus
 
                     isInstalling = false
                 }
@@ -245,15 +284,15 @@ class PatcherViewModel(
                     intent.getStringExtra(UninstallService.EXTRA_UNINSTALL_STATUS_MESSAGE)
                         ?.let(logger::trace)
 
-                    if (pmStatus != PackageInstaller.STATUS_SUCCESS) {
+                    if (pmStatus != PackageInstaller.STATUS_SUCCESS)
-                        installerStatusDialogModel.packageInstallerStatus = pmStatus
+                        packageInstallerStatus = pmStatus
-                    }
                 }
             }
         }
     }
 
-    init { // TODO: navigate away when system-initiated process death is detected because it is not possible to recover from it.
+    init {
+        // TODO: detect system-initiated process death during the patching process.
         ContextCompat.registerReceiver(
             app,
             installerBroadcastReceiver,
@@ -273,7 +312,7 @@ class PatcherViewModel(
     override fun onCleared() {
         super.onCleared()
         app.unregisterReceiver(installerBroadcastReceiver)
-        workManager.cancelWorkById(patcherWorkerId)
+        workManager.cancelWorkById(patcherWorkerId.uuid)
 
         if (input.selectedApp is SelectedApp.Installed && installedApp?.installType == InstallType.MOUNT) {
             GlobalScope.launch(Dispatchers.Main) {
@@ -284,7 +323,10 @@ class PatcherViewModel(
                 }
             }
         }
+    }
 
+    fun onBack() {
+        // tempDir cannot be deleted inside onCleared because it gets called on system-initiated process death.
         tempDir.deleteRecursively()
     }
 
@@ -342,8 +384,7 @@ class PatcherViewModel(
                 // Check if the app version is less than the installed version
                 if (pm.getVersionCode(currentPackageInfo) < pm.getVersionCode(existingPackageInfo)) {
                     // Exit if the selected app version is less than the installed version
-                    installerStatusDialogModel.packageInstallerStatus =
+                    packageInstallerStatus = PackageInstaller.STATUS_FAILURE_CONFLICT
-                        PackageInstaller.STATUS_FAILURE_CONFLICT
                     return@launch
                 }
             }
@@ -368,13 +409,13 @@ class PatcherViewModel(
                         val label = with(pm) {
                             packageInfo.label()
                         }
+
                         // Check for base APK, first check if the app is already installed
                         if (existingPackageInfo == null) {
                             // If the app is not installed, check if the output file is a base apk
                             if (currentPackageInfo.splitNames.isNotEmpty()) {
                                 // Exit if there is no base APK package
-                                installerStatusDialogModel.packageInstallerStatus =
+                                packageInstallerStatus = PackageInstaller.STATUS_FAILURE_INVALID
-                                    PackageInstaller.STATUS_FAILURE_INVALID
                                 return@launch
                             }
                         }
@@ -419,12 +460,17 @@ class PatcherViewModel(
             Log.e(tag, "Failed to install", e)
             app.toast(app.getString(R.string.install_app_fail, e.simpleMessage()))
         } finally {
-            if (!pmInstallStarted)
+            if (!pmInstallStarted) isInstalling = false
-                isInstalling = false
         }
     }
 
-    fun reinstall() = viewModelScope.launch {
+    override fun install() {
+        // InstallType.MOUNT is never used here since this overload is for the package installer status dialog.
+        install(InstallType.DEFAULT)
+    }
+
+    override fun reinstall() {
+        viewModelScope.launch {
             uiSafe(app, R.string.reinstall_app_fail, "Failed to reinstall") {
                 pm.getPackageInfo(outputFile)?.packageName?.let { pm.uninstallPackage(it) }
                     ?: throw Exception("Failed to load application info")
@@ -433,9 +479,14 @@ class PatcherViewModel(
                 isInstalling = true
             }
         }
+    }
 
-    companion object {
+    fun dismissPackageInstallerDialog() {
-        private const val TAG = "ReVanced Patcher"
+        packageInstallerStatus = null
+    }
+
+    private companion object {
+        const val TAG = "ReVanced Patcher"
 
         fun LogLevel.androidLog(msg: String) = when (this) {
             LogLevel.TRACE -> Log.v(TAG, msg)
@@ -444,11 +495,7 @@ class PatcherViewModel(
             LogLevel.ERROR -> Log.e(TAG, msg)
         }
 
-        fun generateSteps(
+        fun generateSteps(context: Context, selectedApp: SelectedApp): List<Step> {
-            context: Context,
-            selectedApp: SelectedApp,
-            downloadProgress: StateFlow<Pair<Long, Long?>?>? = null
-        ): List<Step> {
             val needsDownload =
                 selectedApp is SelectedApp.Download || selectedApp is SelectedApp.Search
 
@@ -457,7 +504,7 @@ class PatcherViewModel(
                     context.getString(R.string.download_apk),
                     StepCategory.PREPARING,
                     state = State.RUNNING,
-                    downloadProgress = downloadProgress,
+                    progressKey = ProgressKey.DOWNLOAD,
                 ).takeIf { needsDownload },
                 Step(
                     context.getString(R.string.patcher_step_load_patches),

app/src/main/java/app/revanced/manager/util/PM.kt

@@ -163,6 +163,8 @@ class PM(
         app.startActivity(it)
     }
 
+    fun canInstallPackages() = app.packageManager.canRequestPackageInstalls()
+
     private fun PackageInstaller.Session.writeApk(apk: File) {
         apk.inputStream().use { inputStream ->
             openWrite(apk.name, 0, apk.length()).use { outputStream ->

app/src/main/java/app/revanced/manager/util/RequestInstallAppsContract.kt

@@ -0,0 +1,18 @@
+package app.revanced.manager.util
+
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import android.provider.Settings
+import androidx.activity.result.contract.ActivityResultContract
+import org.koin.core.component.KoinComponent
+import org.koin.core.component.inject
+
+object RequestInstallAppsContract : ActivityResultContract<String, Boolean>(), KoinComponent {
+    private val pm: PM by inject()
+    override fun createIntent(context: Context, input: String) = Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES, Uri.fromParts("package", input, null))
+
+    override fun parseResult(resultCode: Int, intent: Intent?): Boolean {
+        return pm.canInstallPackages()
+    }
+}

app/src/main/java/app/revanced/manager/util/Util.kt

@@ -3,8 +3,14 @@ package app.revanced.manager.util
 import android.content.Context
 import android.content.Intent
 import android.content.pm.ApplicationInfo
+import android.icu.number.Notation
+import android.icu.number.NumberFormatter
+import android.icu.number.Precision
+import android.icu.text.CompactDecimalFormat
+import android.os.Build
 import android.util.Log
 import android.widget.Toast
+import androidx.annotation.MainThread
 import androidx.annotation.StringRes
 import androidx.compose.foundation.ScrollState
 import androidx.compose.foundation.lazy.LazyListState
@@ -28,6 +34,7 @@ import androidx.core.net.toUri
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleOwner
 import androidx.lifecycle.compose.LocalLifecycleOwner
+import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.lifecycleScope
 import androidx.lifecycle.repeatOnLifecycle
 import app.revanced.manager.R
@@ -48,6 +55,9 @@ import kotlinx.datetime.format.char
 import kotlinx.datetime.toInstant
 import kotlinx.datetime.toLocalDateTime
 import java.util.Locale
+import kotlin.properties.PropertyDelegateProvider
+import kotlin.properties.ReadWriteProperty
+import kotlin.reflect.KProperty
 
 typealias PatchSelection = Map<Int, Set<String>>
 typealias Options = Map<Int, Map<String, Map<String, Any?>>>
@@ -261,3 +271,22 @@ fun <T, R> ((T) -> R).withHapticFeedback(constant: Int): (T) -> R {
 }
 
 fun Modifier.enabled(condition: Boolean) = if (condition) this else alpha(0.5f)
+
+@MainThread
+fun <T : Any> SavedStateHandle.saveableVar(init: () -> T): PropertyDelegateProvider<Any?, ReadWriteProperty<Any?, T>> =
+    PropertyDelegateProvider { _: Any?, property ->
+        val name = property.name
+        if (name !in this) this[name] = init()
+        object : ReadWriteProperty<Any?, T> {
+            override fun getValue(thisRef: Any?, property: KProperty<*>): T = get(name)!!
+            override fun setValue(thisRef: Any?, property: KProperty<*>, value: T) =
+                set(name, value)
+        }
+    }
+
+fun <T : Any> SavedStateHandle.saveableVar(): ReadWriteProperty<Any?, T?> =
+    object : ReadWriteProperty<Any?, T?> {
+        override fun getValue(thisRef: Any?, property: KProperty<*>): T? = get(property.name)
+        override fun setValue(thisRef: Any?, property: KProperty<*>, value: T?) =
+            set(property.name, value)
+    }

app/src/main/res/values/strings.xml

@@ -35,6 +35,9 @@
     <string name="bundle_name_default">Default</string>
     <string name="bundle_name_fallback">Unnamed</string>
 
+    <string name="android_11_bug_dialog_title">Android 11 bug</string>
+    <string name="android_11_bug_dialog_description">The app installation permission must be granted ahead of time to avoid a bug in the Android 11 system that will negatively affect the user experience.</string>
+
     <string name="selected_app_meta_any_version">Any available version</string>
     <string name="app_source_dialog_title">Select source</string>
     <string name="app_source_dialog_option_auto">Auto</string>