Merge "Handle uninstall for selected controls package" into main
diff --git a/packages/SystemUI/multivalentTests/src/com/android/systemui/common/data/repository/PackageChangeRepositoryTest.kt b/packages/SystemUI/multivalentTests/src/com/android/systemui/common/data/repository/PackageChangeRepositoryTest.kt
new file mode 100644
index 0000000..6380ace
--- /dev/null
+++ b/packages/SystemUI/multivalentTests/src/com/android/systemui/common/data/repository/PackageChangeRepositoryTest.kt
@@ -0,0 +1,209 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.common.data.repository
+
+import android.content.Context
+import android.content.pm.PackageManager
+import android.os.Handler
+import android.os.UserHandle
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.SmallTest
+import com.android.systemui.SysuiTestCase
+import com.android.systemui.common.data.shared.model.PackageChangeModel
+import com.android.systemui.coroutines.collectLastValue
+import com.android.systemui.coroutines.collectValues
+import com.android.systemui.kosmos.applicationCoroutineScope
+import com.android.systemui.kosmos.testDispatcher
+import com.android.systemui.kosmos.testScope
+import com.android.systemui.log.logcatLogBuffer
+import com.android.systemui.testKosmos
+import com.android.systemui.util.mockito.whenever
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.test.runTest
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.Mock
+import org.mockito.MockitoAnnotations
+
+@SmallTest
+@RunWith(AndroidJUnit4::class)
+class PackageChangeRepositoryTest : SysuiTestCase() {
+
+    private val kosmos = testKosmos()
+
+    @Mock private lateinit var context: Context
+    @Mock private lateinit var packageManager: PackageManager
+    @Mock private lateinit var handler: Handler
+
+    private lateinit var repository: PackageChangeRepository
+    private lateinit var updateMonitor: PackageUpdateMonitor
+
+    @Before
+    fun setUp() =
+        with(kosmos) {
+            MockitoAnnotations.initMocks(this@PackageChangeRepositoryTest)
+            whenever(context.packageManager).thenReturn(packageManager)
+
+            repository = PackageChangeRepositoryImpl { user ->
+                updateMonitor =
+                    PackageUpdateMonitor(
+                        user = user,
+                        bgDispatcher = testDispatcher,
+                        scope = applicationCoroutineScope,
+                        context = context,
+                        bgHandler = handler,
+                        logger = PackageUpdateLogger(logcatLogBuffer())
+                    )
+                updateMonitor
+            }
+        }
+
+    @Test
+    fun packageUninstalled() =
+        with(kosmos) {
+            testScope.runTest {
+                val packageChange by collectLastValue(repository.packageChanged(USER_100))
+                assertThat(packageChange).isNull()
+
+                updateMonitor.onPackageRemoved(
+                    packageName = TEST_PACKAGE,
+                    uid = UserHandle.getUid(/* userId = */ 100, /* appId = */ 10)
+                )
+
+                assertThat(packageChange).isInstanceOf(PackageChangeModel.Uninstalled::class.java)
+                assertThat(packageChange?.packageName).isEqualTo(TEST_PACKAGE)
+            }
+        }
+
+    @Test
+    fun packageUpdateStarted() =
+        with(kosmos) {
+            testScope.runTest {
+                val packageChange by collectLastValue(repository.packageChanged(USER_100))
+                assertThat(packageChange).isNull()
+
+                updateMonitor.onPackageUpdateStarted(
+                    packageName = TEST_PACKAGE,
+                    uid = UserHandle.getUid(/* userId = */ 100, /* appId = */ 10)
+                )
+
+                assertThat(packageChange).isInstanceOf(PackageChangeModel.UpdateStarted::class.java)
+                assertThat(packageChange?.packageName).isEqualTo(TEST_PACKAGE)
+            }
+        }
+
+    @Test
+    fun packageUpdateFinished() =
+        with(kosmos) {
+            testScope.runTest {
+                val packageChange by collectLastValue(repository.packageChanged(USER_100))
+                assertThat(packageChange).isNull()
+
+                updateMonitor.onPackageUpdateFinished(
+                    packageName = TEST_PACKAGE,
+                    uid = UserHandle.getUid(/* userId = */ 100, /* appId = */ 10)
+                )
+
+                assertThat(packageChange)
+                    .isInstanceOf(PackageChangeModel.UpdateFinished::class.java)
+                assertThat(packageChange?.packageName).isEqualTo(TEST_PACKAGE)
+            }
+        }
+
+    @Test
+    fun packageInstalled() =
+        with(kosmos) {
+            testScope.runTest {
+                val packageChange by collectLastValue(repository.packageChanged(UserHandle.ALL))
+                assertThat(packageChange).isNull()
+
+                updateMonitor.onPackageAdded(
+                    packageName = TEST_PACKAGE,
+                    uid = UserHandle.getUid(/* userId = */ 100, /* appId = */ 10)
+                )
+
+                assertThat(packageChange).isInstanceOf(PackageChangeModel.Installed::class.java)
+                assertThat(packageChange?.packageName).isEqualTo(TEST_PACKAGE)
+            }
+        }
+
+    @Test
+    fun packageIsChanged() =
+        with(kosmos) {
+            testScope.runTest {
+                val packageChange by collectLastValue(repository.packageChanged(USER_100))
+                assertThat(packageChange).isNull()
+
+                updateMonitor.onPackageChanged(
+                    packageName = TEST_PACKAGE,
+                    uid = UserHandle.getUid(/* userId = */ 100, /* appId = */ 10),
+                    components = emptyArray()
+                )
+
+                assertThat(packageChange).isInstanceOf(PackageChangeModel.Changed::class.java)
+                assertThat(packageChange?.packageName).isEqualTo(TEST_PACKAGE)
+            }
+        }
+
+    @Test
+    fun filtersOutUpdatesFromOtherUsers() =
+        with(kosmos) {
+            testScope.runTest {
+                val packageChange by collectLastValue(repository.packageChanged(USER_100))
+                assertThat(packageChange).isNull()
+
+                updateMonitor.onPackageUpdateFinished(
+                    packageName = TEST_PACKAGE,
+                    uid = UserHandle.getUid(/* userId = */ 101, /* appId = */ 10)
+                )
+
+                updateMonitor.onPackageAdded(
+                    packageName = TEST_PACKAGE,
+                    uid = UserHandle.getUid(/* userId = */ 99, /* appId = */ 10)
+                )
+
+                assertThat(packageChange).isNull()
+            }
+        }
+
+    @Test
+    fun listenToUpdatesFromAllUsers() =
+        with(kosmos) {
+            testScope.runTest {
+                val packageChanges by collectValues(repository.packageChanged(UserHandle.ALL))
+                assertThat(packageChanges).isEmpty()
+
+                updateMonitor.onPackageUpdateFinished(
+                    packageName = TEST_PACKAGE,
+                    uid = UserHandle.getUid(/* userId = */ 101, /* appId = */ 10)
+                )
+
+                updateMonitor.onPackageAdded(
+                    packageName = TEST_PACKAGE,
+                    uid = UserHandle.getUid(/* userId = */ 99, /* appId = */ 10)
+                )
+
+                assertThat(packageChanges).hasSize(2)
+            }
+        }
+
+    private companion object {
+        val USER_100 = UserHandle.of(100)
+        const val TEST_PACKAGE = "pkg.test"
+    }
+}
diff --git a/packages/SystemUI/multivalentTests/src/com/android/systemui/common/data/repository/PackageUpdateMonitorTest.kt b/packages/SystemUI/multivalentTests/src/com/android/systemui/common/data/repository/PackageUpdateMonitorTest.kt
new file mode 100644
index 0000000..d610925
--- /dev/null
+++ b/packages/SystemUI/multivalentTests/src/com/android/systemui/common/data/repository/PackageUpdateMonitorTest.kt
@@ -0,0 +1,210 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.common.data.repository
+
+import android.content.Context
+import android.content.pm.PackageManager
+import android.os.Handler
+import android.os.UserHandle
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.SmallTest
+import com.android.systemui.SysuiTestCase
+import com.android.systemui.common.data.shared.model.PackageChangeModel
+import com.android.systemui.coroutines.collectLastValue
+import com.android.systemui.coroutines.collectValues
+import com.android.systemui.kosmos.applicationCoroutineScope
+import com.android.systemui.kosmos.testDispatcher
+import com.android.systemui.kosmos.testScope
+import com.android.systemui.log.logcatLogBuffer
+import com.android.systemui.testKosmos
+import com.android.systemui.util.mockito.whenever
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.test.runCurrent
+import kotlinx.coroutines.test.runTest
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.Mock
+import org.mockito.MockitoAnnotations
+
+@ExperimentalCoroutinesApi
+@SmallTest
+@RunWith(AndroidJUnit4::class)
+class PackageUpdateMonitorTest : SysuiTestCase() {
+    private val kosmos = testKosmos()
+
+    @Mock private lateinit var context: Context
+    @Mock private lateinit var packageManager: PackageManager
+    @Mock private lateinit var handler: Handler
+
+    private lateinit var monitor: PackageUpdateMonitor
+
+    @Before
+    fun setUp() =
+        with(kosmos) {
+            MockitoAnnotations.initMocks(this@PackageUpdateMonitorTest)
+            whenever(context.packageManager).thenReturn(packageManager)
+
+            monitor =
+                PackageUpdateMonitor(
+                    user = USER_100,
+                    bgDispatcher = testDispatcher,
+                    bgHandler = handler,
+                    context = context,
+                    scope = applicationCoroutineScope,
+                    logger = PackageUpdateLogger(logcatLogBuffer())
+                )
+        }
+
+    @Test
+    fun becomesActiveWhenFlowCollected() =
+        with(kosmos) {
+            testScope.runTest {
+                assertThat(monitor.isActive).isFalse()
+                val job = monitor.packageChanged.launchIn(this)
+                runCurrent()
+                assertThat(monitor.isActive).isTrue()
+                job.cancel()
+                runCurrent()
+                assertThat(monitor.isActive).isFalse()
+            }
+        }
+
+    @Test
+    fun packageAdded() =
+        with(kosmos) {
+            testScope.runTest {
+                val packageChange by collectLastValue(monitor.packageChanged)
+                assertThat(packageChange).isNull()
+
+                monitor.onPackageAdded(TEST_PACKAGE, 123)
+
+                assertThat(packageChange)
+                    .isEqualTo(
+                        PackageChangeModel.Installed(packageName = TEST_PACKAGE, packageUid = 123)
+                    )
+            }
+        }
+
+    @Test
+    fun packageRemoved() =
+        with(kosmos) {
+            testScope.runTest {
+                val packageChange by collectLastValue(monitor.packageChanged)
+                assertThat(packageChange).isNull()
+
+                monitor.onPackageRemoved(TEST_PACKAGE, 123)
+
+                assertThat(packageChange)
+                    .isEqualTo(
+                        PackageChangeModel.Uninstalled(packageName = TEST_PACKAGE, packageUid = 123)
+                    )
+            }
+        }
+
+    @Test
+    fun packageChanged() =
+        with(kosmos) {
+            testScope.runTest {
+                val packageChange by collectLastValue(monitor.packageChanged)
+                assertThat(packageChange).isNull()
+
+                monitor.onPackageChanged(TEST_PACKAGE, 123, emptyArray())
+
+                assertThat(packageChange)
+                    .isEqualTo(
+                        PackageChangeModel.Changed(packageName = TEST_PACKAGE, packageUid = 123)
+                    )
+            }
+        }
+
+    @Test
+    fun packageUpdateStarted() =
+        with(kosmos) {
+            testScope.runTest {
+                val packageChange by collectLastValue(monitor.packageChanged)
+                assertThat(packageChange).isNull()
+
+                monitor.onPackageUpdateStarted(TEST_PACKAGE, 123)
+
+                assertThat(packageChange)
+                    .isEqualTo(
+                        PackageChangeModel.UpdateStarted(
+                            packageName = TEST_PACKAGE,
+                            packageUid = 123
+                        )
+                    )
+            }
+        }
+
+    @Test
+    fun packageUpdateFinished() =
+        with(kosmos) {
+            testScope.runTest {
+                val packageChange by collectLastValue(monitor.packageChanged)
+                assertThat(packageChange).isNull()
+
+                monitor.onPackageUpdateFinished(TEST_PACKAGE, 123)
+
+                assertThat(packageChange)
+                    .isEqualTo(
+                        PackageChangeModel.UpdateFinished(
+                            packageName = TEST_PACKAGE,
+                            packageUid = 123
+                        )
+                    )
+            }
+        }
+
+    @Test
+    fun handlesBackflow() =
+        with(kosmos) {
+            testScope.runTest {
+                val latch = MutableSharedFlow<Unit>()
+                val packageChanges by collectValues(monitor.packageChanged.onEach { latch.first() })
+                assertThat(packageChanges).isEmpty()
+
+                monitor.onPackageAdded(TEST_PACKAGE, 123)
+                monitor.onPackageUpdateStarted(TEST_PACKAGE, 123)
+                monitor.onPackageUpdateFinished(TEST_PACKAGE, 123)
+
+                assertThat(packageChanges).isEmpty()
+                latch.emit(Unit)
+                assertThat(packageChanges).hasSize(1)
+                latch.emit(Unit)
+                assertThat(packageChanges).hasSize(2)
+                latch.emit(Unit)
+                assertThat(packageChanges)
+                    .containsExactly(
+                        PackageChangeModel.Installed(TEST_PACKAGE, 123),
+                        PackageChangeModel.UpdateStarted(TEST_PACKAGE, 123),
+                        PackageChangeModel.UpdateFinished(TEST_PACKAGE, 123),
+                    )
+                    .inOrder()
+            }
+        }
+
+    companion object {
+        private val USER_100 = UserHandle.of(100)
+        private const val TEST_PACKAGE = "pkg.test"
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/common/data/CommonDataLayerModule.kt b/packages/SystemUI/src/com/android/systemui/common/data/CommonDataLayerModule.kt
index 27c9b3f..d1c728c 100644
--- a/packages/SystemUI/src/com/android/systemui/common/data/CommonDataLayerModule.kt
+++ b/packages/SystemUI/src/com/android/systemui/common/data/CommonDataLayerModule.kt
@@ -16,6 +16,8 @@
 
 package com.android.systemui.common.data
 
+import com.android.systemui.common.data.repository.PackageChangeRepository
+import com.android.systemui.common.data.repository.PackageChangeRepositoryImpl
 import com.android.systemui.common.ui.data.repository.ConfigurationRepository
 import com.android.systemui.common.ui.data.repository.ConfigurationRepositoryImpl
 import dagger.Binds
@@ -23,5 +25,13 @@
 
 @Module
 abstract class CommonDataLayerModule {
-    @Binds abstract fun bindRepository(impl: ConfigurationRepositoryImpl): ConfigurationRepository
+    @Binds
+    abstract fun bindConfigurationRepository(
+        impl: ConfigurationRepositoryImpl
+    ): ConfigurationRepository
+
+    @Binds
+    abstract fun bindPackageChangeRepository(
+        impl: PackageChangeRepositoryImpl
+    ): PackageChangeRepository
 }
diff --git a/packages/SystemUI/src/com/android/systemui/common/data/repository/PackageChangeRepository.kt b/packages/SystemUI/src/com/android/systemui/common/data/repository/PackageChangeRepository.kt
new file mode 100644
index 0000000..7c7b3db
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/common/data/repository/PackageChangeRepository.kt
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.common.data.repository
+
+import android.os.UserHandle
+import com.android.systemui.common.data.shared.model.PackageChangeModel
+import kotlinx.coroutines.flow.Flow
+
+interface PackageChangeRepository {
+    /**
+     * Emits values when packages for the specified user are changed. See supported modifications in
+     * [PackageChangeModel]
+     *
+     * [UserHandle.USER_ALL] may be used to listen to all users.
+     */
+    fun packageChanged(user: UserHandle): Flow<PackageChangeModel>
+}
diff --git a/packages/SystemUI/src/com/android/systemui/common/data/repository/PackageChangeRepositoryImpl.kt b/packages/SystemUI/src/com/android/systemui/common/data/repository/PackageChangeRepositoryImpl.kt
new file mode 100644
index 0000000..b1b348c
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/common/data/repository/PackageChangeRepositoryImpl.kt
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.common.data.repository
+
+import android.os.UserHandle
+import com.android.systemui.common.data.shared.model.PackageChangeModel
+import com.android.systemui.dagger.SysUISingleton
+import javax.inject.Inject
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.filter
+
+@SysUISingleton
+class PackageChangeRepositoryImpl
+@Inject
+constructor(
+    private val monitorFactory: PackageUpdateMonitor.Factory,
+) : PackageChangeRepository {
+    /**
+     * A [PackageUpdateMonitor] which monitors package updates for all users. The per-user filtering
+     * is done by [packageChanged].
+     */
+    private val monitor by lazy { monitorFactory.create(UserHandle.ALL) }
+
+    override fun packageChanged(user: UserHandle): Flow<PackageChangeModel> =
+        monitor.packageChanged.filter {
+            user == UserHandle.ALL || user == UserHandle.getUserHandleForUid(it.packageUid)
+        }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/common/data/repository/PackageUpdateLogger.kt b/packages/SystemUI/src/com/android/systemui/common/data/repository/PackageUpdateLogger.kt
new file mode 100644
index 0000000..adbb37c
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/common/data/repository/PackageUpdateLogger.kt
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.common.data.repository
+
+import android.os.UserHandle
+import com.android.systemui.common.data.shared.model.PackageChangeModel
+import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.log.LogBuffer
+import com.android.systemui.log.core.LogLevel
+import com.android.systemui.log.dagger.PackageChangeRepoLog
+import javax.inject.Inject
+
+private fun getChangeString(model: PackageChangeModel) =
+    when (model) {
+        is PackageChangeModel.Installed -> "installed"
+        is PackageChangeModel.Uninstalled -> "uninstalled"
+        is PackageChangeModel.UpdateStarted -> "started updating"
+        is PackageChangeModel.UpdateFinished -> "finished updating"
+        is PackageChangeModel.Changed -> "changed"
+    }
+
+/** A debug logger for [PackageChangeRepository]. */
+@SysUISingleton
+class PackageUpdateLogger @Inject constructor(@PackageChangeRepoLog private val buffer: LogBuffer) {
+
+    fun logChange(model: PackageChangeModel) {
+        buffer.log(
+            TAG,
+            LogLevel.DEBUG,
+            {
+                str1 = model.packageName
+                str2 = getChangeString(model)
+                int1 = model.packageUid
+            },
+            {
+                val user = UserHandle.getUserHandleForUid(int1)
+                "Package $str1 ($int1) $str2 on user $user"
+            }
+        )
+    }
+}
+
+private const val TAG = "PackageChangeRepoLog"
diff --git a/packages/SystemUI/src/com/android/systemui/common/data/repository/PackageUpdateMonitor.kt b/packages/SystemUI/src/com/android/systemui/common/data/repository/PackageUpdateMonitor.kt
new file mode 100644
index 0000000..f7cc344
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/common/data/repository/PackageUpdateMonitor.kt
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.common.data.repository
+
+import android.content.Context
+import android.os.Handler
+import android.os.UserHandle
+import com.android.internal.content.PackageMonitor
+import com.android.systemui.common.data.shared.model.PackageChangeModel
+import com.android.systemui.dagger.qualifiers.Application
+import com.android.systemui.dagger.qualifiers.Background
+import dagger.assisted.Assisted
+import dagger.assisted.AssistedFactory
+import dagger.assisted.AssistedInject
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.onEach
+
+/**
+ * A wrapper around [PackageMonitor] which exposes package updates as a flow.
+ *
+ * External clients should use [PackageChangeRepository] instead to ensure only a single callback is
+ * registered for all of SystemUI.
+ */
+class PackageUpdateMonitor
+@AssistedInject
+constructor(
+    @Assisted private val user: UserHandle,
+    @Background private val bgDispatcher: CoroutineDispatcher,
+    @Background private val bgHandler: Handler,
+    @Application private val context: Context,
+    @Application private val scope: CoroutineScope,
+    private val logger: PackageUpdateLogger,
+) : PackageMonitor() {
+
+    @AssistedFactory
+    fun interface Factory {
+        fun create(user: UserHandle): PackageUpdateMonitor
+    }
+
+    var isActive = false
+        private set
+
+    private val _packageChanged =
+        MutableSharedFlow<PackageChangeModel>(replay = 0, extraBufferCapacity = BUFFER_CAPACITY)
+            .apply {
+                // Automatically register/unregister as needed, depending on whether
+                // there are subscribers to this flow.
+                subscriptionCount
+                    .map { it > 0 }
+                    .distinctUntilChanged()
+                    .onEach { active ->
+                        if (active) {
+                            register(context, user, bgHandler)
+                        } else if (isActive) {
+                            // Avoid calling unregister if we were not previously active, as this
+                            // will cause an IllegalStateException.
+                            unregister()
+                        }
+                        isActive = active
+                    }
+                    .flowOn(bgDispatcher)
+                    .launchIn(scope)
+            }
+
+    val packageChanged: Flow<PackageChangeModel>
+        get() = _packageChanged.onEach(logger::logChange)
+
+    override fun onPackageAdded(packageName: String, uid: Int) {
+        super.onPackageAdded(packageName, uid)
+        _packageChanged.tryEmit(PackageChangeModel.Installed(packageName, uid))
+    }
+
+    override fun onPackageRemoved(packageName: String, uid: Int) {
+        super.onPackageRemoved(packageName, uid)
+        _packageChanged.tryEmit(PackageChangeModel.Uninstalled(packageName, uid))
+    }
+
+    override fun onPackageChanged(
+        packageName: String,
+        uid: Int,
+        components: Array<out String>
+    ): Boolean {
+        super.onPackageChanged(packageName, uid, components)
+        _packageChanged.tryEmit(PackageChangeModel.Changed(packageName, uid))
+        return false
+    }
+
+    override fun onPackageUpdateStarted(packageName: String, uid: Int) {
+        super.onPackageUpdateStarted(packageName, uid)
+        _packageChanged.tryEmit(PackageChangeModel.UpdateStarted(packageName, uid))
+    }
+
+    override fun onPackageUpdateFinished(packageName: String, uid: Int) {
+        super.onPackageUpdateFinished(packageName, uid)
+        _packageChanged.tryEmit(PackageChangeModel.UpdateFinished(packageName, uid))
+    }
+
+    private companion object {
+        // This capacity is the number of package changes that we will keep buffered in the shared
+        // flow. It is unlikely that at any given time there would be this many changes being
+        // processed by consumers, but this is done just in case that many packages are changed at
+        // the same time and there is backflow due to consumers processing the changes more slowly
+        // than they are being emitted.
+        const val BUFFER_CAPACITY = 100
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/common/data/shared/model/PackageChangeModel.kt b/packages/SystemUI/src/com/android/systemui/common/data/shared/model/PackageChangeModel.kt
new file mode 100644
index 0000000..853eff7
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/common/data/shared/model/PackageChangeModel.kt
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.common.data.shared.model
+
+import android.content.Intent
+
+/** Represents changes to an installed package. */
+sealed interface PackageChangeModel {
+    val packageName: String
+    val packageUid: Int
+
+    /**
+     * An existing application package was uninstalled.
+     *
+     * Equivalent to receiving the [Intent.ACTION_PACKAGE_REMOVED] broadcast with
+     * [Intent.EXTRA_REPLACING] set to false.
+     */
+    data class Uninstalled(override val packageName: String, override val packageUid: Int) :
+        PackageChangeModel
+
+    /**
+     * A new version of an existing application is going to be installed.
+     *
+     * Equivalent to receiving the [Intent.ACTION_PACKAGE_REMOVED] broadcast with
+     * [Intent.EXTRA_REPLACING] set to true.
+     */
+    data class UpdateStarted(override val packageName: String, override val packageUid: Int) :
+        PackageChangeModel
+
+    /**
+     * A new version of an existing application package has been installed, replacing the old
+     * version.
+     *
+     * Equivalent to receiving the [Intent.ACTION_PACKAGE_ADDED] broadcast with
+     * [Intent.EXTRA_REPLACING] set to true.
+     */
+    data class UpdateFinished(override val packageName: String, override val packageUid: Int) :
+        PackageChangeModel
+
+    /**
+     * A new application package has been installed.
+     *
+     * Equivalent to receiving the [Intent.ACTION_PACKAGE_ADDED] broadcast with
+     * [Intent.EXTRA_REPLACING] set to false.
+     */
+    data class Installed(override val packageName: String, override val packageUid: Int) :
+        PackageChangeModel
+
+    /**
+     * An existing application package has been changed (for example, a component has been enabled
+     * or disabled).
+     *
+     * Equivalent to receiving the [Intent.ACTION_PACKAGE_CHANGED] broadcast.
+     */
+    data class Changed(override val packageName: String, override val packageUid: Int) :
+        PackageChangeModel
+}
diff --git a/packages/SystemUI/src/com/android/systemui/controls/start/ControlsStartable.kt b/packages/SystemUI/src/com/android/systemui/controls/start/ControlsStartable.kt
index 0218f45..20bfbc9 100644
--- a/packages/SystemUI/src/com/android/systemui/controls/start/ControlsStartable.kt
+++ b/packages/SystemUI/src/com/android/systemui/controls/start/ControlsStartable.kt
@@ -26,6 +26,8 @@
 import androidx.annotation.WorkerThread
 import com.android.systemui.CoreStartable
 import com.android.systemui.broadcast.BroadcastDispatcher
+import com.android.systemui.common.data.shared.model.PackageChangeModel
+import com.android.systemui.common.data.repository.PackageChangeRepository
 import com.android.systemui.controls.controller.ControlsController
 import com.android.systemui.controls.dagger.ControlsComponent
 import com.android.systemui.controls.management.ControlsListingController
@@ -33,8 +35,16 @@
 import com.android.systemui.controls.panels.SelectedComponentRepository
 import com.android.systemui.controls.ui.SelectedItem
 import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.dagger.qualifiers.Application
 import com.android.systemui.dagger.qualifiers.Background
 import com.android.systemui.settings.UserTracker
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.filter
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import java.util.concurrent.Executor
 import javax.inject.Inject
 
@@ -53,13 +63,16 @@
 class ControlsStartable
 @Inject
 constructor(
-        @Background private val executor: Executor,
-        private val controlsComponent: ControlsComponent,
-        private val userTracker: UserTracker,
-        private val authorizedPanelsRepository: AuthorizedPanelsRepository,
-        private val selectedComponentRepository: SelectedComponentRepository,
-        private val userManager: UserManager,
-        private val broadcastDispatcher: BroadcastDispatcher,
+    @Application private val scope: CoroutineScope,
+    @Background private val bgDispatcher: CoroutineDispatcher,
+    @Background private val executor: Executor,
+    private val controlsComponent: ControlsComponent,
+    private val userTracker: UserTracker,
+    private val authorizedPanelsRepository: AuthorizedPanelsRepository,
+    private val selectedComponentRepository: SelectedComponentRepository,
+    private val packageChangeRepository: PackageChangeRepository,
+    private val userManager: UserManager,
+    private val broadcastDispatcher: BroadcastDispatcher,
 ) : CoreStartable {
 
     // These two controllers can only be accessed after `start` method once we've checked if the
@@ -78,6 +91,8 @@
             }
         }
 
+    private var packageJob: Job? = null
+
     override fun start() {}
 
     override fun onBootCompleted() {
@@ -94,6 +109,21 @@
         controlsListingController.forceReload()
         selectDefaultPanelIfNecessary()
         bindToPanel()
+        monitorPackageUninstall()
+    }
+
+    private fun monitorPackageUninstall() {
+        packageJob?.cancel()
+        packageJob = packageChangeRepository.packageChanged(userTracker.userHandle)
+            .filter {
+                val selectedPackage =
+                    selectedComponentRepository.getSelectedComponent()?.componentName?.packageName
+                // Selected package was uninstalled
+                (it is PackageChangeModel.Uninstalled) && (it.packageName == selectedPackage)
+            }
+            .onEach { selectedComponentRepository.removeSelectedComponent() }
+            .flowOn(bgDispatcher)
+            .launchIn(scope)
     }
 
     private fun selectDefaultPanelIfNecessary() {
diff --git a/packages/SystemUI/src/com/android/systemui/log/dagger/LogModule.java b/packages/SystemUI/src/com/android/systemui/log/dagger/LogModule.java
index 0d5ba64..1e67771 100644
--- a/packages/SystemUI/src/com/android/systemui/log/dagger/LogModule.java
+++ b/packages/SystemUI/src/com/android/systemui/log/dagger/LogModule.java
@@ -18,6 +18,7 @@
 
 import android.os.Build;
 
+import com.android.systemui.common.data.repository.PackageChangeRepository;
 import com.android.systemui.dagger.SysUISingleton;
 import com.android.systemui.log.LogBuffer;
 import com.android.systemui.log.LogBufferFactory;
@@ -600,4 +601,12 @@
     public static LogBuffer provideQBluetoothTileDialogLogBuffer(LogBufferFactory factory) {
         return factory.create("BluetoothTileDialogLog", 50);
     }
+
+    /** Provides a {@link LogBuffer} for {@link PackageChangeRepository} */
+    @Provides
+    @SysUISingleton
+    @PackageChangeRepoLog
+    public static LogBuffer providePackageChangeRepoLogBuffer(LogBufferFactory factory) {
+        return factory.create("PackageChangeRepo", 50);
+    }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/log/dagger/PackageChangeRepoLog.kt b/packages/SystemUI/src/com/android/systemui/log/dagger/PackageChangeRepoLog.kt
new file mode 100644
index 0000000..93b776c
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/log/dagger/PackageChangeRepoLog.kt
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.log.dagger
+
+import com.android.systemui.common.data.repository.PackageChangeRepository
+import com.android.systemui.log.LogBuffer
+import javax.inject.Qualifier
+
+/** A [LogBuffer] for [PackageChangeRepository]. */
+@Qualifier
+@MustBeDocumented
+@Retention(AnnotationRetention.RUNTIME)
+annotation class PackageChangeRepoLog
diff --git a/packages/SystemUI/tests/src/com/android/systemui/controls/start/ControlsStartableTest.kt b/packages/SystemUI/tests/src/com/android/systemui/controls/start/ControlsStartableTest.kt
index 8f65fc8..bcef67e 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/controls/start/ControlsStartableTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/controls/start/ControlsStartableTest.kt
@@ -24,19 +24,28 @@
 import android.content.IntentFilter
 import android.content.pm.ApplicationInfo
 import android.content.pm.ServiceInfo
+import android.os.UserHandle
 import android.os.UserManager
 import android.testing.AndroidTestingRunner
 import androidx.test.filters.SmallTest
 import com.android.systemui.SysuiTestCase
 import com.android.systemui.broadcast.BroadcastDispatcher
+import com.android.systemui.common.data.repository.fakePackageChangeRepository
+import com.android.systemui.common.data.repository.packageChangeRepository
+import com.android.systemui.common.data.shared.model.PackageChangeModel
 import com.android.systemui.controls.ControlsServiceInfo
 import com.android.systemui.controls.controller.ControlsController
 import com.android.systemui.controls.dagger.ControlsComponent
 import com.android.systemui.controls.management.ControlsListingController
 import com.android.systemui.controls.panels.AuthorizedPanelsRepository
 import com.android.systemui.controls.panels.FakeSelectedComponentRepository
+import com.android.systemui.controls.panels.SelectedComponentRepository
 import com.android.systemui.controls.ui.SelectedItem
+import com.android.systemui.kosmos.applicationCoroutineScope
+import com.android.systemui.kosmos.testDispatcher
+import com.android.systemui.kosmos.testScope
 import com.android.systemui.settings.UserTracker
+import com.android.systemui.testKosmos
 import com.android.systemui.util.concurrency.FakeExecutor
 import com.android.systemui.util.mockito.any
 import com.android.systemui.util.mockito.argumentCaptor
@@ -48,6 +57,9 @@
 import com.android.systemui.util.time.FakeSystemClock
 import com.google.common.truth.Truth.assertThat
 import java.util.Optional
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.runCurrent
+import kotlinx.coroutines.test.runTest
 import org.junit.Before
 import org.junit.Test
 import org.junit.runner.RunWith
@@ -61,10 +73,13 @@
 import org.mockito.Mockito.`when`
 import org.mockito.MockitoAnnotations
 
+@OptIn(ExperimentalCoroutinesApi::class)
 @SmallTest
 @RunWith(AndroidTestingRunner::class)
 class ControlsStartableTest : SysuiTestCase() {
 
+    private val kosmos = testKosmos()
+
     @Mock private lateinit var controlsController: ControlsController
     @Mock private lateinit var controlsListingController: ControlsListingController
     @Mock private lateinit var userTracker: UserTracker
@@ -72,7 +87,7 @@
     @Mock private lateinit var userManager: UserManager
     @Mock private lateinit var broadcastDispatcher: BroadcastDispatcher
 
-    private val preferredPanelsRepository = FakeSelectedComponentRepository()
+    private lateinit var preferredPanelsRepository: FakeSelectedComponentRepository
 
     private lateinit var fakeExecutor: FakeExecutor
 
@@ -81,8 +96,10 @@
         MockitoAnnotations.initMocks(this)
         whenever(authorizedPanelsRepository.getPreferredPackages()).thenReturn(setOf())
         whenever(userManager.isUserUnlocked(anyInt())).thenReturn(true)
+        whenever(userTracker.userHandle).thenReturn(UserHandle.of(1))
 
         fakeExecutor = FakeExecutor(FakeSystemClock())
+        preferredPanelsRepository = FakeSelectedComponentRepository()
     }
 
     @Test
@@ -306,6 +323,100 @@
         verify(controlsController, never()).setPreferredSelection(any())
     }
 
+    @Test
+    fun testSelectedComponentIsUninstalled() =
+        with(kosmos) {
+            testScope.runTest {
+                val selectedComponent =
+                    SelectedComponentRepository.SelectedComponent(
+                        "panel",
+                        TEST_COMPONENT_PANEL,
+                        isPanel = true
+                    )
+                preferredPanelsRepository.setSelectedComponent(selectedComponent)
+                val activeUser = UserHandle.of(100)
+                whenever(userTracker.userHandle).thenReturn(activeUser)
+
+                createStartable(enabled = true).onBootCompleted()
+                fakeExecutor.runAllReady()
+                runCurrent()
+
+                assertThat(preferredPanelsRepository.getSelectedComponent())
+                    .isEqualTo(selectedComponent)
+                fakePackageChangeRepository.notifyChange(
+                    PackageChangeModel.Uninstalled(
+                        packageName = TEST_PACKAGE_PANEL,
+                        packageUid = UserHandle.getUid(100, 1)
+                    )
+                )
+                runCurrent()
+
+                assertThat(preferredPanelsRepository.getSelectedComponent()).isNull()
+            }
+        }
+
+    @Test
+    fun testSelectedComponentIsChanged() =
+        with(kosmos) {
+            testScope.runTest {
+                val selectedComponent =
+                    SelectedComponentRepository.SelectedComponent(
+                        "panel",
+                        TEST_COMPONENT_PANEL,
+                        isPanel = true
+                    )
+                preferredPanelsRepository.setSelectedComponent(selectedComponent)
+                val activeUser = UserHandle.of(100)
+                whenever(userTracker.userHandle).thenReturn(activeUser)
+
+                createStartable(enabled = true).onBootCompleted()
+                fakeExecutor.runAllReady()
+                runCurrent()
+
+                fakePackageChangeRepository.notifyChange(
+                    PackageChangeModel.Changed(
+                        packageName = TEST_PACKAGE_PANEL,
+                        packageUid = UserHandle.getUid(100, 1)
+                    )
+                )
+                runCurrent()
+
+                assertThat(preferredPanelsRepository.getSelectedComponent())
+                    .isEqualTo(selectedComponent)
+            }
+        }
+
+    @Test
+    fun testOtherPackageIsUninstalled() =
+        with(kosmos) {
+            testScope.runTest {
+                val selectedComponent =
+                    SelectedComponentRepository.SelectedComponent(
+                        "panel",
+                        TEST_COMPONENT_PANEL,
+                        isPanel = true
+                    )
+                preferredPanelsRepository.setSelectedComponent(selectedComponent)
+                val activeUser = UserHandle.of(100)
+                whenever(userTracker.userHandle).thenReturn(activeUser)
+
+                createStartable(enabled = true).onBootCompleted()
+                fakeExecutor.runAllReady()
+                runCurrent()
+
+                fakePackageChangeRepository.notifyChange(
+                    PackageChangeModel.Uninstalled(
+                        packageName = TEST_PACKAGE,
+                        packageUid = UserHandle.getUid(100, 1)
+                    )
+                )
+                runCurrent()
+
+                assertThat(preferredPanelsRepository.getSelectedComponent())
+                    .isEqualTo(selectedComponent)
+            }
+        }
+
     private fun setUpControlsListingControls(listings: List<ControlsServiceInfo>) {
         doAnswer { doReturn(listings).`when`(controlsListingController).getCurrentServices() }
             .`when`(controlsListingController)
@@ -326,11 +437,14 @@
                 }
             }
         return ControlsStartable(
+            kosmos.applicationCoroutineScope,
+            kosmos.testDispatcher,
             fakeExecutor,
             component,
             userTracker,
             authorizedPanelsRepository,
             preferredPanelsRepository,
+            kosmos.packageChangeRepository,
             userManager,
             broadcastDispatcher,
         )
diff --git a/packages/SystemUI/tests/utils/src/com/android/systemui/common/data/repository/FakePackageChangeRepository.kt b/packages/SystemUI/tests/utils/src/com/android/systemui/common/data/repository/FakePackageChangeRepository.kt
new file mode 100644
index 0000000..60f0448
--- /dev/null
+++ b/packages/SystemUI/tests/utils/src/com/android/systemui/common/data/repository/FakePackageChangeRepository.kt
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.common.data.repository
+
+import android.os.UserHandle
+import com.android.systemui.common.data.shared.model.PackageChangeModel
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.filter
+
+class FakePackageChangeRepository : PackageChangeRepository {
+
+    private var _packageChanged = MutableSharedFlow<PackageChangeModel>()
+
+    override fun packageChanged(user: UserHandle) =
+        _packageChanged.filter {
+            user == UserHandle.ALL || user == UserHandle.getUserHandleForUid(it.packageUid)
+        }
+
+    suspend fun notifyChange(model: PackageChangeModel) {
+        _packageChanged.emit(model)
+    }
+}
diff --git a/packages/SystemUI/tests/utils/src/com/android/systemui/common/data/repository/PackageChangeRepositoryKosmos.kt b/packages/SystemUI/tests/utils/src/com/android/systemui/common/data/repository/PackageChangeRepositoryKosmos.kt
new file mode 100644
index 0000000..adc05e0
--- /dev/null
+++ b/packages/SystemUI/tests/utils/src/com/android/systemui/common/data/repository/PackageChangeRepositoryKosmos.kt
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.common.data.repository
+
+import com.android.systemui.kosmos.Kosmos
+
+var Kosmos.packageChangeRepository: PackageChangeRepository by
+    Kosmos.Fixture { fakePackageChangeRepository }
+val Kosmos.fakePackageChangeRepository by Kosmos.Fixture { FakePackageChangeRepository() }