Camera Compat: Track cameraId, and the app and task that had it opened. (8e44b47e) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/wm/AppCompatCameraStateStrategyForTask.java

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		/*
		* Copyright (C) 2025 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.server.wm;

		import static android.app.ActivityTaskManager.INVALID_TASK_ID;
		import static android.os.Process.INVALID_PID;

		import static com.android.internal.protolog.WmProtoLogGroups.WM_DEBUG_STATES;

		import android.annotation.NonNull;
		import android.annotation.Nullable;

		import com.android.internal.protolog.ProtoLog;

		import java.util.ArrayList;
		import java.util.HashMap;
		import java.util.List;

		/** {@link AppCompatCameraStateStrategy} that tracks task-cameraId (and app) pairs. */
		class AppCompatCameraStateStrategyForTask implements AppCompatCameraStateStrategy {
		// Data set for app data and active camera IDs since we need to 1) get a camera id by a task
		// when setting up camera compat mode; 2) get a task by a camera id when camera connection is
		// closed and we need to clean up our records.
		private final CameraIdAppPairsSet mCameraAppInfoSet = new CameraIdAppPairsSet();

		// Repository for the newest camera state update. Camera opened and closed signals are processed
		// with a delay. In case of different signals/states pending without being processed, only the
		// newest state will be processed, and the old overwritten.
		private final PendingCameraUpdateRepository mPendingCameraUpdateRepository =
		new PendingCameraUpdateRepository();

		@NonNull
		private final DisplayContent mDisplayContent;

		AppCompatCameraStateStrategyForTask(@NonNull DisplayContent displayContent) {
		mDisplayContent = displayContent;
		}

		@Override
		@NonNull
		public CameraAppInfo trackOnCameraOpened(@NonNull String cameraId,
		@NonNull String packageName) {
		final CameraAppInfo cameraAppInfo = createCameraAppInfo(cameraId, packageName);
		ProtoLog.v(WM_DEBUG_STATES,
		"Display id=%d is notified that Camera %s is open for package %s",
		mDisplayContent.mDisplayId, cameraId, packageName);
		mPendingCameraUpdateRepository.trackPendingCameraOpen(cameraAppInfo);
		return cameraAppInfo;
		}

		@Override
		public void notifyPolicyCameraOpenedIfNeeded(@NonNull CameraAppInfo cameraAppInfo,
		@NonNull AppCompatCameraStatePolicy policy) {
		if (!mPendingCameraUpdateRepository.removePendingCameraOpen(cameraAppInfo)) {
		// Camera compat mode update has happened already or was cancelled
		// because camera was closed.
		return;
		}

		final WindowProcessController cameraApp = getAppProcessForCallingId(cameraAppInfo.mPid);

		if (cameraApp == null) {
		return;
		}
		final ActivityRecord cameraActivity = findUniqueActivityWithPackageName(
		cameraApp.mInfo.packageName);

		if (cameraActivity == null \|\| cameraActivity.getTask() == null) {
		return;
		}

		// TODO(b/423883666): Use `WM_DEBUG_CAMERA_COMPAT`.
		ProtoLog.v(WM_DEBUG_STATES, "CameraOpen: cameraApp=" + cameraApp
		+ " cameraInfo.mPid=" + cameraAppInfo.mPid
		+ " cameraTask=" + cameraActivity.getTask()
		+ " cameraAppInfo.mTaskId=" + cameraAppInfo.mTaskId);

		final boolean anyCameraAlreadyOpenForTask = mCameraAppInfoSet
		.containsAnyCameraForTaskId(cameraActivity.getTask().mTaskId);

		mCameraAppInfoSet.add(cameraAppInfo);
		if (!anyCameraAlreadyOpenForTask) {
		// Only notify listeners if the app has newly opened camera.
		// This does not currently support multiple camera tasks in a single app - this
		// would be a very rare use case (especially for targeted fixed-orientation apps).
		// Given that the camera framework notifies CameraStateMonitor with a packageName
		// and not a task or activity, it would be difficult to correctly and consistently
		// know which task has camera access.
		//
		// The above check is for whether the same task has opened camera, which usually
		// means either the camera was restarted due to config change, or because the app
		// switched between front and back cameras - either way this is not interesting for
		// camera policies.
		// Note: if any camera policy ever needs to dynamically change the treatment based
		// on the camera (front, back, external) this should notify when camera changes and
		// add a method policies can call to check if camera has been running (mostly used
		// to return early).
		policy.onCameraOpened(cameraApp, cameraActivity.getTask());
		}
		}

		@Override
		@NonNull
		public CameraAppInfo trackOnCameraClosed(@NonNull String cameraId) {
		// This function is synchronous, and cameraClosed signal will come before cameraOpened.
		// Therefore, there will be only one app recorded with this camera opened.
		CameraAppInfo cameraAppInfo = mCameraAppInfoSet.getAnyCameraAppStateForCameraId(cameraId);
		if (cameraAppInfo == null) {
		ProtoLog.w(WM_DEBUG_STATES, "Camera closed but cannot find the app which had it"
		+ " opened.");
		cameraAppInfo = new CameraAppInfo(cameraId, INVALID_PID, INVALID_TASK_ID, null);
		}
		mPendingCameraUpdateRepository.trackPendingCameraClose(cameraAppInfo);
		return cameraAppInfo;
		}

		@Override
		public boolean notifyPolicyCameraClosedIfNeeded(@NonNull CameraAppInfo cameraAppInfo,
		@NonNull AppCompatCameraStatePolicy policy) {
		if (!mPendingCameraUpdateRepository.removePendingCameraClose(cameraAppInfo)) {
		// Already reconnected to this camera, no need to clean up.
		return true;
		}

		final Task cameraTask = mDisplayContent.getTask(task ->
		task.getTaskInfo().taskId == cameraAppInfo.mTaskId);
		final boolean canClose = cameraTask == null
		\|\| policy.canCameraBeClosed(cameraAppInfo.mCameraId, cameraTask);
		if (canClose) {
		// Finish cleaning up. Remove only cameraId of this particular task.
		mCameraAppInfoSet.remove(cameraAppInfo);
		if (!mCameraAppInfoSet.containsAnyCameraForTaskId(cameraAppInfo.mTaskId)) {
		final WindowProcessController app = getAppProcessForCallingId(
		cameraAppInfo.mPid);
		// Only notify the listeners if the camera is not running - this close signal
		// could be from switching cameras (e.g. back to front camera, and vice versa).
		policy.onCameraClosed(app, cameraTask);
		}
		}

		return canClose;
		}

		@Override
		public boolean isCameraRunningForActivity(@NonNull ActivityRecord activity) {
		return activity.getTask() != null && mCameraAppInfoSet
		.containsAnyCameraForTaskId(activity.getTask().mTaskId);
		}

		// TODO(b/336474959): try to decouple `cameraId` from the listeners.
		@Override
		public boolean isCameraWithIdRunningForActivity(@NonNull ActivityRecord activity,
		@NonNull String cameraId) {
		return activity.getTask() != null && mCameraAppInfoSet
		.containsCameraIdAndTask(cameraId, activity.getTask().mTaskId);
		}

		@NonNull
		private CameraAppInfo createCameraAppInfo(@NonNull String cameraId,
		@Nullable String packageName) {
		final ActivityRecord cameraActivity = packageName == null ? null
		: findUniqueActivityWithPackageName(packageName);
		final Task cameraTask = cameraActivity == null ? null : cameraActivity.getTask();
		final WindowProcessController cameraApp = cameraActivity == null ? null
		: cameraActivity.app;
		return new CameraAppInfo(cameraId,
		cameraApp == null ? INVALID_PID : cameraApp.getPid(),
		cameraTask == null ? INVALID_TASK_ID : cameraTask.mTaskId,
		packageName);
		}

		// TODO(b/335165310): verify that this works in multi instance and permission dialogs.
		/**
		* Finds a visible activity with the given package name.
		*
		* <p>If there are multiple visible activities with a given package name, and none of them are
		* the `topRunningActivity`, returns null.
		*/
		@Nullable
		private ActivityRecord findUniqueActivityWithPackageName(@NonNull String packageName) {
		final ActivityRecord topActivity = mDisplayContent.topRunningActivity(
		/* considerKeyguardState= */ true);
		if (topActivity != null && topActivity.packageName.equals(packageName)) {
		return topActivity;
		}

		final List<ActivityRecord> activitiesOfPackageWhichOpenedCamera = new ArrayList<>();
		mDisplayContent.forAllActivities(activityRecord -> {
		if (activityRecord.isVisibleRequested()
		&& activityRecord.packageName.equals(packageName)) {
		activitiesOfPackageWhichOpenedCamera.add(activityRecord);
		}
		});

		if (activitiesOfPackageWhichOpenedCamera.isEmpty()) {
		ProtoLog.w(WM_DEBUG_STATES, "Cannot find camera activity.");
		return null;
		}

		if (activitiesOfPackageWhichOpenedCamera.size() == 1) {
		return activitiesOfPackageWhichOpenedCamera.getFirst();
		}

		// Return null if we cannot determine which activity opened camera. This is preferred to
		// applying treatment to the wrong activity.
		ProtoLog.w(WM_DEBUG_STATES, "Cannot determine which activity opened camera.");
		return null;
		}

		@NonNull
		public String toString() {
		return " mCameraAppInfoSet=" + mCameraAppInfoSet
		.getSummaryForDisplayRotationHistoryRecord();
		}

		@Nullable
		private WindowProcessController getAppProcessForCallingId(int pid) {
		return mDisplayContent.mAtmService.mProcessMap.getProcess(pid);
		}

		/**
		* Repository for @{@link CameraAppInfo}s and the camera status changes (opening or closing
		* camera) that are in-flight.
		*
		* <p>As camera opening and closing have different delays, and some of them are quick switches
		* caused by activity refresh or front/back camera switch, tracking pending states enables
		* to skip brief activity changes which cause flickering.
		*/
		static class PendingCameraUpdateRepository {
		/** Enum describing the newest camera state that is not yet processed. */
		enum PendingCameraState {
		OPENED,
		CLOSED
		}

		/**
		* Set of apps that have camera status update (newly opened or closed) scheduled to be
		* processed.
		*
		* <p>Existing state will be overwritten, as the newest signal (opened/closed) should be
		* respected.
		*/
		private final HashMap<CameraAppInfo, PendingCameraState> mPendingCameraStateMap =
		new HashMap<>();

		void trackPendingCameraOpen(@NonNull CameraAppInfo cameraAppInfo) {
		// Some apps can’t handle configuration changes coming at the same time with Camera
		// setup so delaying orientation update to accommodate for that.
		mPendingCameraStateMap.put(cameraAppInfo, PendingCameraState.OPENED);
		}

		void trackPendingCameraClose(@NonNull CameraAppInfo cameraAppInfo) {
		mPendingCameraStateMap.put(cameraAppInfo, PendingCameraState.CLOSED);
		}

		/**
		* @return true if camera open was pending for given {@param cameraAppInfo}.
		*/
		boolean removePendingCameraOpen(@NonNull CameraAppInfo cameraAppInfo) {
		return mPendingCameraStateMap.remove(cameraAppInfo, PendingCameraState.OPENED);
		}

		/**
		* @return true if camera close was pending for given {@param cameraAppInfo}.
		*/
		boolean removePendingCameraClose(@NonNull CameraAppInfo cameraAppInfo) {
		return mPendingCameraStateMap.remove(cameraAppInfo, PendingCameraState.CLOSED);
		}
		}
		}

services/core/java/com/android/server/wm/CameraIdAppPairsSet.java

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		/*
		* Copyright (C) 2025 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.server.wm;

		import android.annotation.NonNull;
		import android.annotation.Nullable;
		import android.util.ArraySet;

		/**
		* Data set for the currently active cameraId and the app that opened it.
		*
		* <p>This class is not thread-safe.
		*/
		final class CameraIdAppPairsSet {
		private final ArraySet<CameraAppInfo> mCameraAppInfoSet = new ArraySet<>();

		boolean isEmpty() {
		return mCameraAppInfoSet.isEmpty();
		}

		void add(@NonNull CameraAppInfo cameraAppInfo) {
		mCameraAppInfoSet.add(cameraAppInfo);
		}

		boolean containsAnyCameraForTaskId(int taskId) {
		for (int i = 0; i < mCameraAppInfoSet.size(); i++) {
		final CameraAppInfo info = mCameraAppInfoSet.valueAt(i);
		if (info.mTaskId == taskId) {
		return true;
		}
		}
		return false;
		}

		@Nullable
		CameraAppInfo getAnyCameraAppStateForCameraId(@NonNull String cameraId) {
		for (int i = 0; i < mCameraAppInfoSet.size(); i++) {
		final CameraAppInfo info = mCameraAppInfoSet.valueAt(i);
		if (info.mCameraId.equals(cameraId)) {
		return info;
		}
		}
		return null;
		}

		boolean containsCameraIdAndTask(@NonNull String cameraId, int taskId) {
		for (int i = 0; i < mCameraAppInfoSet.size(); i++) {
		final CameraAppInfo info = mCameraAppInfoSet.valueAt(i);
		if (info.mCameraId.equals(cameraId) && info.mTaskId == taskId) {
		return true;
		}
		}
		return false;
		}

		boolean remove(@NonNull CameraAppInfo cameraAppInfo) {
		return mCameraAppInfoSet.remove(cameraAppInfo);
		}

		@NonNull
		String getSummaryForDisplayRotationHistoryRecord() {
		return "{ mCameraAppInfoSet=" + mCameraAppInfoSet + " }";
		}

		@Override
		public String toString() {
		return getSummaryForDisplayRotationHistoryRecord();
		}
		}

services/core/java/com/android/server/wm/CameraStateMonitor.java

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		@@ -26,6 +26,7 @@ import android.os.Handler;

		import com.android.internal.annotations.VisibleForTesting;
		import com.android.internal.protolog.ProtoLog;
		import com.android.window.flags.Flags;

		/**
		* Class that listens to camera open/closed signals, keeps track of the current apps using camera,
		@@ -92,7 +93,9 @@ class CameraStateMonitor {
		mAppCompatCameraStatePolicy = appCompatCameraStatePolicy;
		mWmService = displayContent.mWmService;
		mCameraManager = mWmService.mContext.getSystemService(CameraManager.class);
		mAppCompatCameraStateStrategy = new AppCompatCameraStateStrategyForPackage(displayContent);
		mAppCompatCameraStateStrategy = Flags.enableCameraCompatTrackTaskAndAppBugfix()
		? new AppCompatCameraStateStrategyForTask(displayContent)
		: new AppCompatCameraStateStrategyForPackage(displayContent);
		}

		/** Starts listening to camera opened/closed signals. */

services/tests/wmtests/src/com/android/server/wm/AppCompatCameraStateStrategyForTaskTests.java

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services/tests/wmtests/src/com/android/server/wm/CameraIdAppPairsSetTests.java

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		/*
		* 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.server.wm;

		import static org.junit.Assert.assertFalse;
		import static org.junit.Assert.assertNotNull;
		import static org.junit.Assert.assertTrue;

		import android.platform.test.annotations.Presubmit;

		import org.junit.Before;
		import org.junit.Test;
		import org.junit.runner.RunWith;

		/**
		* Tests for {@link CameraIdAppPairsSet}.
		*
		* Build/Install/Run:
		* atest WmTests:CameraIdAppPairsSetTests
		*/
		@Presubmit
		@RunWith(WindowTestRunner.class)
		public class CameraIdAppPairsSetTests {
		private CameraIdAppPairsSet mMapping;

		private static final String TEST_PACKAGE_1 = "com.test.package.one";
		private static final String TEST_PACKAGE_2 = "com.test.package.two";
		private static final int TASK_ID_1 = 1;
		private static final int TASK_ID_2 = 2;
		private static final int PID_1 = 101;
		private static final int PID_2 = 102;
		private static final String CAMERA_ID_1 = "1234";
		private static final String CAMERA_ID_2 = "5678";
		private final CameraAppInfo mCameraAppInfo1Camera1 =
		new CameraAppInfo(CAMERA_ID_1, PID_1, TASK_ID_1, TEST_PACKAGE_1);
		private final CameraAppInfo mCameraAppInfo1Camera2 =
		new CameraAppInfo(CAMERA_ID_2, PID_1, TASK_ID_1, TEST_PACKAGE_1);
		private final CameraAppInfo mCameraAppInfo2Camera1 =
		new CameraAppInfo(CAMERA_ID_1, PID_2, TASK_ID_2, TEST_PACKAGE_2);
		private final CameraAppInfo mCameraAppInfo2Camera2 =
		new CameraAppInfo(CAMERA_ID_2, PID_2, TASK_ID_2, TEST_PACKAGE_2);

		@Before
		public void setUp() {
		mMapping = new CameraIdAppPairsSet();
		}

		@Test
		public void mappingEmptyAtStart() {
		assertTrue(mMapping.isEmpty());
		}

		@Test
		public void addTaskAndCameraId_containsCameraIdAndTask() {
		mMapping.add(mCameraAppInfo1Camera1);

		assertTrue(mMapping.containsCameraIdAndTask(CAMERA_ID_1, mCameraAppInfo1Camera1.mTaskId));
		}

		@Test
		public void addTwoTasksAndCameraIds_containsCameraIdsAndTasks() {
		mMapping.add(mCameraAppInfo1Camera1);
		mMapping.add(mCameraAppInfo2Camera2);

		assertTrue(mMapping.containsCameraIdAndTask(CAMERA_ID_1, mCameraAppInfo1Camera1.mTaskId));
		assertTrue(mMapping.containsCameraIdAndTask(CAMERA_ID_2, mCameraAppInfo2Camera2.mTaskId));
		}

		@Test
		public void addTwoTasksAndCameraIds_checkContainsCameraIdAndTaskFromDifferentPair_false() {
		mMapping.add(mCameraAppInfo1Camera1);
		mMapping.add(mCameraAppInfo2Camera2);

		assertFalse(mMapping.containsCameraIdAndTask(CAMERA_ID_1, mCameraAppInfo2Camera2.mTaskId));
		}

		@Test
		public void addTwoTasksForTheSameCamera_bothExist() {
		mMapping.add(mCameraAppInfo1Camera1);
		mMapping.add(mCameraAppInfo2Camera2);

		assertTrue(mMapping.containsCameraIdAndTask(CAMERA_ID_1, mCameraAppInfo1Camera1.mTaskId));
		assertTrue(mMapping.containsCameraIdAndTask(CAMERA_ID_2, mCameraAppInfo2Camera2.mTaskId));
		}

		@Test
		public void addTwoCamerasForTheSameTask_bothExist() {
		mMapping.add(mCameraAppInfo1Camera1);
		mMapping.add(mCameraAppInfo1Camera2);

		assertTrue(mMapping.containsCameraIdAndTask(CAMERA_ID_1, mCameraAppInfo1Camera1.mTaskId));
		assertTrue(mMapping.containsCameraIdAndTask(CAMERA_ID_2, mCameraAppInfo1Camera2.mTaskId));
		}

		@Test
		public void addTwoTasksForTheSameCamera_returnsAnyTask() {
		mMapping.add(mCameraAppInfo1Camera1);
		mMapping.add(mCameraAppInfo2Camera1);

		assertNotNull(mMapping.getAnyCameraAppStateForCameraId(CAMERA_ID_1));
		}

		@Test
		public void addTwoCamerasForTheSameTask_containsAnyCamera() {
		mMapping.add(mCameraAppInfo1Camera1);
		mMapping.add(mCameraAppInfo1Camera2);

		assertTrue(mMapping.containsAnyCameraForTaskId(mCameraAppInfo1Camera1.mTaskId));
		}

		@Test
		public void addAndRemoveCameraId_containsOtherCameraAndTask() {
		mMapping.add(mCameraAppInfo1Camera1);
		mMapping.add(mCameraAppInfo2Camera2);

		mMapping.remove(mCameraAppInfo1Camera1);

		assertTrue(mMapping.containsCameraIdAndTask(CAMERA_ID_2, mCameraAppInfo2Camera2.mTaskId));
		}

		@Test
		public void addAndRemoveOnlyCameraId_empty() {
		mMapping.add(mCameraAppInfo1Camera1);
		mMapping.remove(mCameraAppInfo1Camera1);

		assertTrue(mMapping.isEmpty());
		}

		@Test
		public void addAndRemoveOnlyCameraIdUsingEqualObject_empty() {
		mMapping.add(mCameraAppInfo1Camera1);
		mMapping.remove(new CameraAppInfo(mCameraAppInfo1Camera1.mCameraId,
		mCameraAppInfo1Camera1.mPid, mCameraAppInfo1Camera1.mTaskId,
		mCameraAppInfo1Camera1.mPackageName));

		assertTrue(mMapping.isEmpty());
		}
		}