PSS: Fix MediaProjectionTaskView leaking in KeyguardController

TaskPreviewSizeProvider was registering itself as a configuration
changes listener when created, and never unregistering itself again.
Since a new one is created every time the app chooser is created,
it would create a new leak every time.
The class indirectly references MediaProjectionTaskView, which itself
holds onto large Bitmaps, which can make the leak costly.

Bug: 290754514
Test: Manually - Took heap dump before and after the fix
Test: TaskPreviewSizeProviderTest
Change-Id: Id03d9b3b5a94193f0e5d75a6ff602dd74b45f40c

packages/SystemUI/src/com/android/systemui/media/MediaProjectionAppSelectorActivity.kt

@@ -30,6 +30,9 @@ import android.os.IBinder
 import android.os.ResultReceiver
 import android.os.UserHandle
 import android.view.ViewGroup
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.LifecycleRegistry
 import com.android.internal.annotations.VisibleForTesting
 import com.android.internal.app.AbstractMultiProfilePagerAdapter.EmptyStateProvider
 import com.android.internal.app.AbstractMultiProfilePagerAdapter.MyUserIdProvider
@@ -54,7 +57,11 @@ class MediaProjectionAppSelectorActivity(
     /** This is used to override the dependency in a screenshot test */
     @VisibleForTesting
     private val listControllerFactory: ((userHandle: UserHandle) -> ResolverListController)?
-) : ChooserActivity(), MediaProjectionAppSelectorView, MediaProjectionAppSelectorResultHandler {
+) :
+    ChooserActivity(),
+    MediaProjectionAppSelectorView,
+    MediaProjectionAppSelectorResultHandler,
+    LifecycleOwner {
 
     @Inject
     constructor(
@@ -62,6 +69,8 @@ class MediaProjectionAppSelectorActivity(
         activityLauncher: AsyncActivityLauncher
     ) : this(componentFactory, activityLauncher, listControllerFactory = null)
 
+    private val lifecycleRegistry = LifecycleRegistry(this)
+    override val lifecycle = lifecycleRegistry
     private lateinit var configurationController: ConfigurationController
     private lateinit var controller: MediaProjectionAppSelectorController
     private lateinit var recentsViewController: MediaProjectionRecentsViewController
@@ -75,7 +84,9 @@ class MediaProjectionAppSelectorActivity(
     override fun getLayoutResource() = R.layout.media_projection_app_selector
 
     public override fun onCreate(bundle: Bundle?) {
+        lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_CREATE)
         component = componentFactory.create(activity = this, view = this, resultHandler = this)
+        component.lifecycleObservers.forEach { lifecycle.addObserver(it) }
 
         // Create a separate configuration controller for this activity as the configuration
         // might be different from the global one
@@ -96,6 +107,26 @@ class MediaProjectionAppSelectorActivity(
         controller.init()
     }
 
+    override fun onStart() {
+        super.onStart()
+        lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_START)
+    }
+
+    override fun onResume() {
+        super.onResume()
+        lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_RESUME)
+    }
+
+    override fun onPause() {
+        lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_PAUSE)
+        super.onPause()
+    }
+
+    override fun onStop() {
+        lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_STOP)
+        super.onStop()
+    }
+
     override fun onConfigurationChanged(newConfig: Configuration) {
         super.onConfigurationChanged(newConfig)
         configurationController.onConfigurationChanged(newConfig)
@@ -152,6 +183,8 @@ class MediaProjectionAppSelectorActivity(
     }
 
     override fun onDestroy() {
+        lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_DESTROY)
+        component.lifecycleObservers.forEach { lifecycle.removeObserver(it) }
         // onDestroy is also called when an app is selected, in that case we only want to send
         // RECORD_CONTENT_TASK but not RECORD_CANCEL
         if (!taskSelected) {

packages/SystemUI/src/com/android/systemui/mediaprojection/appselector/MediaProjectionAppSelectorComponent.kt

@@ -20,6 +20,7 @@ import android.app.Activity
 import android.content.ComponentName
 import android.content.Context
 import android.os.UserHandle
+import androidx.lifecycle.DefaultLifecycleObserver
 import com.android.launcher3.icons.IconFactory
 import com.android.systemui.dagger.qualifiers.Application
 import com.android.systemui.media.MediaProjectionAppSelectorActivity
@@ -46,6 +47,7 @@ import dagger.Provides
 import dagger.Subcomponent
 import dagger.multibindings.ClassKey
 import dagger.multibindings.IntoMap
+import dagger.multibindings.IntoSet
 import javax.inject.Qualifier
 import javax.inject.Scope
 import kotlinx.coroutines.CoroutineScope
@@ -100,6 +102,12 @@ interface MediaProjectionAppSelectorModule {
     @MediaProjectionAppSelectorScope
     fun bindAppIconLoader(impl: IconLoaderLibAppIconLoader): AppIconLoader
 
+    @Binds
+    @IntoSet
+    fun taskPreviewSizeProviderAsLifecycleObserver(
+        impl: TaskPreviewSizeProvider
+    ): DefaultLifecycleObserver
+
     companion object {
         @Provides
         @MediaProjectionAppSelector
@@ -166,4 +174,5 @@ interface MediaProjectionAppSelectorComponent {
     @get:PersonalProfile val personalProfileUserHandle: UserHandle
 
     @MediaProjectionAppSelector val configurationController: ConfigurationController
+    val lifecycleObservers: Set<DefaultLifecycleObserver>
 }

packages/SystemUI/src/com/android/systemui/mediaprojection/appselector/view/TaskPreviewSizeProvider.kt

@@ -21,6 +21,8 @@ import android.content.res.Configuration
 import android.graphics.Rect
 import android.view.WindowInsets.Type
 import android.view.WindowManager
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.LifecycleOwner
 import com.android.systemui.mediaprojection.appselector.MediaProjectionAppSelectorScope
 import com.android.systemui.mediaprojection.appselector.view.TaskPreviewSizeProvider.TaskPreviewSizeListener
 import com.android.systemui.shared.recents.utilities.Utilities.isLargeScreen
@@ -35,18 +37,22 @@ class TaskPreviewSizeProvider
 constructor(
     private val context: Context,
     private val windowManager: WindowManager,
-    configurationController: ConfigurationController
-) : CallbackController<TaskPreviewSizeListener>, ConfigurationListener {
+    private val configurationController: ConfigurationController,
+) : CallbackController<TaskPreviewSizeListener>, ConfigurationListener, DefaultLifecycleObserver {
 
     /** Returns the size of the task preview on the screen in pixels */
     val size: Rect = calculateSize()
 
     private val listeners = arrayListOf<TaskPreviewSizeListener>()
 
-    init {
+    override fun onCreate(owner: LifecycleOwner) {
         configurationController.addCallback(this)
     }
 
+    override fun onDestroy(owner: LifecycleOwner) {
+        configurationController.removeCallback(this)
+    }
+
     override fun onConfigChanged(newConfig: Configuration) {
         val newSize = calculateSize()
         if (newSize != size) {

packages/SystemUI/tests/src/com/android/systemui/mediaprojection/appselector/view/TaskPreviewSizeProviderTest.kt

@@ -26,6 +26,7 @@ import android.view.WindowInsets
 import android.view.WindowManager
 import android.view.WindowMetrics
 import androidx.core.view.WindowInsetsCompat.Type
+import androidx.lifecycle.LifecycleOwner
 import androidx.test.filters.SmallTest
 import com.android.systemui.SysuiTestCase
 import com.android.systemui.mediaprojection.appselector.view.TaskPreviewSizeProvider.TaskPreviewSizeListener
@@ -41,9 +42,10 @@ import org.junit.Test
 @SmallTest
 class TaskPreviewSizeProviderTest : SysuiTestCase() {
 
-    private val mockContext: Context = mock()
-    private val resources: Resources = mock()
-    private val windowManager: WindowManager = mock()
+    private val lifecycleOwner = mock<LifecycleOwner>()
+    private val mockContext = mock<Context>()
+    private val resources = mock<Resources>()
+    private val windowManager = mock<WindowManager>()
     private val sizeUpdates = arrayListOf<Rect>()
     private val testConfigurationController = FakeConfigurationController()
 
@@ -76,7 +78,7 @@ class TaskPreviewSizeProviderTest : SysuiTestCase() {
     @Test
     fun size_phoneDisplayAndRotate_emitsSizeUpdate() {
         givenDisplay(width = 400, height = 600, isTablet = false)
-        createSizeProvider()
+        createSizeProvider().also { it.onCreate(lifecycleOwner) }
 
         givenDisplay(width = 600, height = 400, isTablet = false)
         testConfigurationController.onConfigurationChanged(Configuration())
@@ -87,7 +89,7 @@ class TaskPreviewSizeProviderTest : SysuiTestCase() {
     @Test
     fun size_phoneDisplayAndRotateConfigurationChange_returnsUpdatedSize() {
         givenDisplay(width = 400, height = 600, isTablet = false)
-        val sizeProvider = createSizeProvider()
+        val sizeProvider = createSizeProvider().also { it.onCreate(lifecycleOwner) }
 
         givenDisplay(width = 600, height = 400, isTablet = false)
         testConfigurationController.onConfigurationChanged(Configuration())
@@ -95,6 +97,20 @@ class TaskPreviewSizeProviderTest : SysuiTestCase() {
         assertThat(sizeProvider.size).isEqualTo(Rect(0, 0, 150, 100))
     }
 
+    @Test
+    fun size_phoneDisplayAndRotateConfigurationChange_afterChooserDestroyed_doesNotUpdate() {
+        givenDisplay(width = 400, height = 600, isTablet = false)
+        val sizeProvider = createSizeProvider()
+        val previousSize = Rect(sizeProvider.size)
+
+        sizeProvider.onCreate(lifecycleOwner)
+        sizeProvider.onDestroy(lifecycleOwner)
+        givenDisplay(width = 600, height = 400, isTablet = false)
+        testConfigurationController.onConfigurationChanged(Configuration())
+
+        assertThat(sizeProvider.size).isEqualTo(previousSize)
+    }
+
     private fun givenTaskbarSize(size: Int) {
         val windowInsets =
             WindowInsets.Builder()