services/core/java/com/android/server/am/ActivityTaskManagerService.java

/*
 * Copyright (C) 2018 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.am;

import static android.Manifest.permission.BIND_VOICE_INTERACTION;
import static android.Manifest.permission.CHANGE_CONFIGURATION;
import static android.Manifest.permission.CONTROL_REMOTE_APP_TRANSITION_ANIMATIONS;
import static android.Manifest.permission.INTERNAL_SYSTEM_WINDOW;
import static android.Manifest.permission.MANAGE_ACTIVITY_STACKS;
import static android.Manifest.permission.READ_FRAME_BUFFER;
import static android.Manifest.permission.REMOVE_TASKS;
import static android.Manifest.permission.START_TASKS_FROM_RECENTS;
import static android.app.ActivityManager.LOCK_TASK_MODE_NONE;
import static android.app.ActivityTaskManagerInternal.ASSIST_KEY_CONTENT;
import static android.app.ActivityTaskManagerInternal.ASSIST_KEY_DATA;
import static android.app.ActivityTaskManagerInternal.ASSIST_KEY_RECEIVER_EXTRAS;
import static android.app.ActivityTaskManagerInternal.ASSIST_KEY_STRUCTURE;
import static android.app.ActivityTaskManager.INVALID_STACK_ID;
import static android.app.ActivityTaskManager.RESIZE_MODE_PRESERVE_WINDOW;
import static android.app.ActivityTaskManager.SPLIT_SCREEN_CREATE_MODE_TOP_OR_LEFT;
import static android.app.WindowConfiguration.ACTIVITY_TYPE_STANDARD;
import static android.app.WindowConfiguration.ACTIVITY_TYPE_UNDEFINED;
import static android.app.WindowConfiguration.WINDOWING_MODE_FREEFORM;
import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN;
import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN_OR_SPLIT_SCREEN_SECONDARY;
import static android.app.WindowConfiguration.WINDOWING_MODE_PINNED;
import static android.app.WindowConfiguration.WINDOWING_MODE_SPLIT_SCREEN_PRIMARY;
import static android.app.WindowConfiguration.WINDOWING_MODE_SPLIT_SCREEN_SECONDARY;
import static android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED;
import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
import static android.content.pm.PackageManager.PERMISSION_GRANTED;
import static android.os.Process.SYSTEM_UID;
import static android.service.voice.VoiceInteractionSession.SHOW_SOURCE_APPLICATION;
import static android.view.Display.DEFAULT_DISPLAY;
import static android.view.Display.INVALID_DISPLAY;
import static android.view.WindowManager.TRANSIT_ACTIVITY_OPEN;
import static android.view.WindowManager.TRANSIT_NONE;
import static android.view.WindowManager.TRANSIT_TASK_IN_PLACE;
import static android.view.WindowManager.TRANSIT_TASK_OPEN;
import static android.view.WindowManager.TRANSIT_TASK_TO_FRONT;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_ALL;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_CONFIGURATION;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_FOCUS;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_IMMERSIVE;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_LOCKTASK;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_OOM_ADJ;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_STACK;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_SWITCH;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_VISIBILITY;
import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_FOCUS;
import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_IMMERSIVE;
import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_LOCKTASK;
import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_STACK;
import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_SWITCH;
import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_VISIBILITY;
import static com.android.server.am.ActivityManagerDebugConfig.TAG_AM;
import static com.android.server.am.ActivityManagerDebugConfig.TAG_WITH_CLASS_NAME;
import static com.android.server.am.ActivityManagerService.ALLOW_FULL_ONLY;
import static com.android.server.am.ActivityManagerService.ANIMATE;
import static com.android.server.am.ActivityManagerService.DISPATCH_SCREEN_KEYGUARD_MSG;
import static com.android.server.am.ActivityManagerService.STOCK_PM_FLAGS;
import static com.android.server.am.ActivityStack.REMOVE_TASK_MODE_DESTROYING;
import static com.android.server.am.ActivityStackSupervisor.DEFER_RESUME;
import static com.android.server.am.ActivityStackSupervisor.MATCH_TASK_IN_STACKS_ONLY;
import static com.android.server.am.ActivityStackSupervisor.MATCH_TASK_IN_STACKS_OR_RECENT_TASKS;
import static com.android.server.am.ActivityStackSupervisor.ON_TOP;
import static com.android.server.am.ActivityStackSupervisor.PRESERVE_WINDOWS;
import static com.android.server.am.ActivityStackSupervisor.REMOVE_FROM_RECENTS;
import static com.android.server.am.TaskRecord.INVALID_TASK_ID;
import static com.android.server.am.TaskRecord.LOCK_TASK_AUTH_DONT_LOCK;
import static com.android.server.am.TaskRecord.REPARENT_KEEP_STACK_AT_FRONT;
import static com.android.server.am.TaskRecord.REPARENT_LEAVE_STACK_IN_PLACE;
import static com.android.server.wm.RecentsAnimationController.REORDER_KEEP_IN_PLACE;
import static com.android.server.wm.RecentsAnimationController.REORDER_MOVE_TO_ORIGINAL_POSITION;

import android.Manifest;
import android.annotation.Nullable;
import android.annotation.UserIdInt;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityOptions;
import android.app.ActivityTaskManager;
import android.app.ActivityTaskManagerInternal;
import android.app.AppGlobals;
import android.app.IActivityTaskManager;
import android.app.IApplicationThread;
import android.app.IAssistDataReceiver;
import android.app.ITaskStackListener;
import android.app.PictureInPictureParams;
import android.app.ProfilerInfo;
import android.app.RemoteAction;
import android.app.WaitResult;
import android.app.WindowConfiguration;
import android.app.admin.DevicePolicyCache;
import android.app.assist.AssistContent;
import android.app.assist.AssistStructure;
import android.app.usage.UsageEvents;
import android.content.ActivityNotFoundException;
import android.content.ComponentName;
import android.content.Context;
import android.content.IIntentSender;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ParceledListSlice;
import android.content.pm.ResolveInfo;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.Point;
import android.graphics.Rect;
import android.metrics.LogMaker;
import android.net.Uri;
import android.os.Binder;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.PersistableBundle;
import android.os.Process;
import android.os.RemoteException;
import android.os.TransactionTooLargeException;
import android.os.UserHandle;
import android.provider.Settings;
import android.service.voice.IVoiceInteractionSession;
import android.service.voice.VoiceInteractionManagerInternal;
import android.telecom.TelecomManager;
import android.text.TextUtils;
import android.util.Slog;

import android.util.SparseIntArray;
import android.util.proto.ProtoOutputStream;
import android.view.IRecentsAnimationRunner;
import android.view.RemoteAnimationAdapter;
import android.view.RemoteAnimationDefinition;

import com.android.internal.app.AssistUtils;
import com.android.internal.app.IVoiceInteractor;
import com.android.internal.logging.MetricsLogger;
import com.android.internal.os.logging.MetricsLoggerWrapper;
import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
import com.android.internal.policy.IKeyguardDismissCallback;
import com.android.internal.policy.KeyguardDismissCallback;
import com.android.internal.util.Preconditions;
import com.android.server.LocalServices;
import com.android.server.SystemService;
import com.android.server.Watchdog;
import com.android.server.vr.VrManagerInternal;
import com.android.server.wm.PinnedStackWindowController;
import com.android.server.wm.WindowManagerService;

import java.io.File;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

/**
 * System service for managing activities and their containers (task, stacks, displays,... ).
 *
 * {@hide}
 */
public class ActivityTaskManagerService extends IActivityTaskManager.Stub {
    private static final String TAG = TAG_WITH_CLASS_NAME ? "ActivityTaskManagerService" : TAG_AM;
    private static final String TAG_STACK = TAG + POSTFIX_STACK;
    private static final String TAG_SWITCH = TAG + POSTFIX_SWITCH;
    private static final String TAG_IMMERSIVE = TAG + POSTFIX_IMMERSIVE;
    private static final String TAG_FOCUS = TAG + POSTFIX_FOCUS;
    private static final String TAG_VISIBILITY = TAG + POSTFIX_VISIBILITY;
    private static final String TAG_LOCKTASK = TAG + POSTFIX_LOCKTASK;

    Context mContext;
    H mH;
    ActivityManagerService mAm;
    /* Global service lock used by the package the owns this service. */
    Object mGlobalLock;
    ActivityStackSupervisor mStackSupervisor;
    WindowManagerService mWindowManager;
    /** List of intents that were used to start the most recent tasks. */
    private RecentTasks mRecentTasks;
    /** State of external calls telling us if the device is awake or asleep. */
    private boolean mKeyguardShown = false;

    // Wrapper around VoiceInteractionServiceManager
    private AssistUtils mAssistUtils;

    // VoiceInteraction session ID that changes for each new request except when
    // being called for multi-window assist in a single session.
    private int mViSessionId = 1000;

    // How long to wait in getAssistContextExtras for the activity and foreground services
    // to respond with the result.
    private static final int PENDING_ASSIST_EXTRAS_TIMEOUT = 500;

    // How long top wait when going through the modern assist (which doesn't need to block
    // on getting this result before starting to launch its UI).
    private static final int PENDING_ASSIST_EXTRAS_LONG_TIMEOUT = 2000;

    // How long to wait in getAutofillAssistStructure() for the activity to respond with the result.
    private static final int PENDING_AUTOFILL_ASSIST_STRUCTURE_TIMEOUT = 2000;

    private final ArrayList<PendingAssistExtras> mPendingAssistExtras = new ArrayList<>();

    // Keeps track of the active voice interaction service component, notified from
    // VoiceInteractionManagerService
    ComponentName mActiveVoiceInteractionServiceComponent;

    private VrController mVrController;
    KeyguardController mKeyguardController;
    private final ClientLifecycleManager mLifecycleManager;
    private TaskChangeNotificationController mTaskChangeNotificationController;
    /** The controller for all operations related to locktask. */
    private LockTaskController mLockTaskController;

    boolean mSuppressResizeConfigChanges;

    private final UpdateConfigurationResult mTmpUpdateConfigurationResult =
            new UpdateConfigurationResult();

    static final class UpdateConfigurationResult {
        // Configuration changes that were updated.
        int changes;
        // If the activity was relaunched to match the new configuration.
        boolean activityRelaunched;

        void reset() {
            changes = 0;
            activityRelaunched = false;
        }
    }

    ActivityTaskManagerService(Context context) {
        mContext = context;
        mLifecycleManager = new ClientLifecycleManager();
    }

    void onSystemReady() {
        mAssistUtils = new AssistUtils(mContext);
        mVrController.onSystemReady();
        mRecentTasks.onSystemReadyLocked();
    }

    // TODO: Will be converted to WM lock once transition is complete.
    void setActivityManagerService(ActivityManagerService am) {
        mAm = am;
        mGlobalLock = mAm;
        mH = new H(mAm.mHandlerThread.getLooper());
        mStackSupervisor = mAm.mStackSupervisor;
        mTaskChangeNotificationController =
                new TaskChangeNotificationController(mAm, mStackSupervisor, mH);
        mLockTaskController = new LockTaskController(mContext, mStackSupervisor, mH);
        mRecentTasks = createRecentTasks();
        mStackSupervisor.setRecentTasks(mRecentTasks);
        mVrController = new VrController(mAm);
        mKeyguardController = mStackSupervisor.getKeyguardController();
    }

    void setWindowManager(WindowManagerService wm) {
        mWindowManager = wm;
        mLockTaskController.setWindowManager(wm);
    }

    protected RecentTasks createRecentTasks() {
        return new RecentTasks(this, mStackSupervisor);
    }

    RecentTasks getRecentTasks() {
        return mRecentTasks;
    }

    ClientLifecycleManager getLifecycleManager() {
        return mLifecycleManager;
    }

    TaskChangeNotificationController getTaskChangeNotificationController() {
        return mTaskChangeNotificationController;
    }

    LockTaskController getLockTaskController() {
        return mLockTaskController;
    }

    private void start() {
        LocalServices.addService(ActivityTaskManagerInternal.class, new LocalService());
    }

    public static final class Lifecycle extends SystemService {
        private final ActivityTaskManagerService mService;

        public Lifecycle(Context context) {
            super(context);
            mService = new ActivityTaskManagerService(context);
        }

        @Override
        public void onStart() {
            publishBinderService(Context.ACTIVITY_TASK_SERVICE, mService);
            mService.start();
        }

        public ActivityTaskManagerService getService() {
            return mService;
        }
    }

    @Override
    public final int startActivity(IApplicationThread caller, String callingPackage,
            Intent intent, String resolvedType, IBinder resultTo, String resultWho, int requestCode,
            int startFlags, ProfilerInfo profilerInfo, Bundle bOptions) {
        return startActivityAsUser(caller, callingPackage, intent, resolvedType, resultTo,
                resultWho, requestCode, startFlags, profilerInfo, bOptions,
                UserHandle.getCallingUserId());
    }

    @Override
    public final int startActivities(IApplicationThread caller, String callingPackage,
            Intent[] intents, String[] resolvedTypes, IBinder resultTo, Bundle bOptions,
            int userId) {
        final String reason = "startActivities";
        mAm.enforceNotIsolatedCaller(reason);
        userId = mAm.mUserController.handleIncomingUser(Binder.getCallingPid(),
                Binder.getCallingUid(), userId, false, ALLOW_FULL_ONLY, reason, null);
        // TODO: Switch to user app stacks here.
        return mAm.getActivityStartController().startActivities(caller, -1, callingPackage, intents,
                resolvedTypes, resultTo, SafeActivityOptions.fromBundle(bOptions), userId, reason);
    }

    @Override
    public int startActivityAsUser(IApplicationThread caller, String callingPackage,
            Intent intent, String resolvedType, IBinder resultTo, String resultWho, int requestCode,
            int startFlags, ProfilerInfo profilerInfo, Bundle bOptions, int userId) {
        return startActivityAsUser(caller, callingPackage, intent, resolvedType, resultTo,
                resultWho, requestCode, startFlags, profilerInfo, bOptions, userId,
                true /*validateIncomingUser*/);
    }

    int startActivityAsUser(IApplicationThread caller, String callingPackage,
            Intent intent, String resolvedType, IBinder resultTo, String resultWho, int requestCode,
            int startFlags, ProfilerInfo profilerInfo, Bundle bOptions, int userId,
            boolean validateIncomingUser) {
        mAm.enforceNotIsolatedCaller("startActivityAsUser");

        userId = mAm.getActivityStartController().checkTargetUser(userId, validateIncomingUser,
                Binder.getCallingPid(), Binder.getCallingUid(), "startActivityAsUser");

        // TODO: Switch to user app stacks here.
        return mAm.getActivityStartController().obtainStarter(intent, "startActivityAsUser")
                .setCaller(caller)
                .setCallingPackage(callingPackage)
                .setResolvedType(resolvedType)
                .setResultTo(resultTo)
                .setResultWho(resultWho)
                .setRequestCode(requestCode)
                .setStartFlags(startFlags)
                .setProfilerInfo(profilerInfo)
                .setActivityOptions(bOptions)
                .setMayWait(userId)
                .execute();

    }

    @Override
    public int startActivityIntentSender(IApplicationThread caller, IIntentSender target,
            IBinder whitelistToken, Intent fillInIntent, String resolvedType, IBinder resultTo,
            String resultWho, int requestCode, int flagsMask, int flagsValues, Bundle bOptions)
            throws TransactionTooLargeException {
        mAm.enforceNotIsolatedCaller("startActivityIntentSender");
        // Refuse possible leaked file descriptors
        if (fillInIntent != null && fillInIntent.hasFileDescriptors()) {
            throw new IllegalArgumentException("File descriptors passed in Intent");
        }

        if (!(target instanceof PendingIntentRecord)) {
            throw new IllegalArgumentException("Bad PendingIntent object");
        }

        PendingIntentRecord pir = (PendingIntentRecord)target;

        synchronized (mGlobalLock) {
            // If this is coming from the currently resumed activity, it is
            // effectively saying that app switches are allowed at this point.
            final ActivityStack stack = mAm.getFocusedStack();
            if (stack.mResumedActivity != null &&
                    stack.mResumedActivity.info.applicationInfo.uid == Binder.getCallingUid()) {
                mAm.mAppSwitchesAllowedTime = 0;
            }
        }
        int ret = pir.sendInner(0, fillInIntent, resolvedType, whitelistToken, null, null,
                resultTo, resultWho, requestCode, flagsMask, flagsValues, bOptions);
        return ret;
    }

    @Override
    public boolean startNextMatchingActivity(IBinder callingActivity, Intent intent,
            Bundle bOptions) {
        // Refuse possible leaked file descriptors
        if (intent != null && intent.hasFileDescriptors()) {
            throw new IllegalArgumentException("File descriptors passed in Intent");
        }
        SafeActivityOptions options = SafeActivityOptions.fromBundle(bOptions);

        synchronized (mGlobalLock) {
            final ActivityRecord r = ActivityRecord.isInStackLocked(callingActivity);
            if (r == null) {
                SafeActivityOptions.abort(options);
                return false;
            }
            if (r.app == null || r.app.thread == null) {
                // The caller is not running...  d'oh!
                SafeActivityOptions.abort(options);
                return false;
            }
            intent = new Intent(intent);
            // The caller is not allowed to change the data.
            intent.setDataAndType(r.intent.getData(), r.intent.getType());
            // And we are resetting to find the next component...
            intent.setComponent(null);

            final boolean debug = ((intent.getFlags() & Intent.FLAG_DEBUG_LOG_RESOLUTION) != 0);

            ActivityInfo aInfo = null;
            try {
                List<ResolveInfo> resolves =
                        AppGlobals.getPackageManager().queryIntentActivities(
                                intent, r.resolvedType,
                                PackageManager.MATCH_DEFAULT_ONLY | STOCK_PM_FLAGS,
                                UserHandle.getCallingUserId()).getList();

                // Look for the original activity in the list...
                final int N = resolves != null ? resolves.size() : 0;
                for (int i=0; i<N; i++) {
                    ResolveInfo rInfo = resolves.get(i);
                    if (rInfo.activityInfo.packageName.equals(r.packageName)
                            && rInfo.activityInfo.name.equals(r.info.name)) {
                        // We found the current one...  the next matching is
                        // after it.
                        i++;
                        if (i<N) {
                            aInfo = resolves.get(i).activityInfo;
                        }
                        if (debug) {
                            Slog.v(TAG, "Next matching activity: found current " + r.packageName
                                    + "/" + r.info.name);
                            Slog.v(TAG, "Next matching activity: next is " + ((aInfo == null)
                                    ? "null" : aInfo.packageName + "/" + aInfo.name));
                        }
                        break;
                    }
                }
            } catch (RemoteException e) {
            }

            if (aInfo == null) {
                // Nobody who is next!
                SafeActivityOptions.abort(options);
                if (debug) Slog.d(TAG, "Next matching activity: nothing found");
                return false;
            }

            intent.setComponent(new ComponentName(
                    aInfo.applicationInfo.packageName, aInfo.name));
            intent.setFlags(intent.getFlags()&~(
                    Intent.FLAG_ACTIVITY_FORWARD_RESULT|
                            Intent.FLAG_ACTIVITY_CLEAR_TOP|
                            Intent.FLAG_ACTIVITY_MULTIPLE_TASK|
                            FLAG_ACTIVITY_NEW_TASK));

            // Okay now we need to start the new activity, replacing the currently running activity.
            // This is a little tricky because we want to start the new one as if the current one is
            // finished, but not finish the current one first so that there is no flicker.
            // And thus...
            final boolean wasFinishing = r.finishing;
            r.finishing = true;

            // Propagate reply information over to the new activity.
            final ActivityRecord resultTo = r.resultTo;
            final String resultWho = r.resultWho;
            final int requestCode = r.requestCode;
            r.resultTo = null;
            if (resultTo != null) {
                resultTo.removeResultsLocked(r, resultWho, requestCode);
            }

            final long origId = Binder.clearCallingIdentity();
            // TODO(b/64750076): Check if calling pid should really be -1.
            final int res = mAm.getActivityStartController()
                    .obtainStarter(intent, "startNextMatchingActivity")
                    .setCaller(r.app.thread)
                    .setResolvedType(r.resolvedType)
                    .setActivityInfo(aInfo)
                    .setResultTo(resultTo != null ? resultTo.appToken : null)
                    .setResultWho(resultWho)
                    .setRequestCode(requestCode)
                    .setCallingPid(-1)
                    .setCallingUid(r.launchedFromUid)
                    .setCallingPackage(r.launchedFromPackage)
                    .setRealCallingPid(-1)
                    .setRealCallingUid(r.launchedFromUid)
                    .setActivityOptions(options)
                    .execute();
            Binder.restoreCallingIdentity(origId);

            r.finishing = wasFinishing;
            if (res != ActivityManager.START_SUCCESS) {
                return false;
            }
            return true;
        }
    }

    @Override
    public final WaitResult startActivityAndWait(IApplicationThread caller, String callingPackage,
            Intent intent, String resolvedType, IBinder resultTo, String resultWho, int requestCode,
            int startFlags, ProfilerInfo profilerInfo, Bundle bOptions, int userId) {
        final WaitResult res = new WaitResult();
        synchronized (mGlobalLock) {
            mAm.enforceNotIsolatedCaller("startActivityAndWait");
            userId = mAm.mUserController.handleIncomingUser(Binder.getCallingPid(),
                    Binder.getCallingUid(), userId, false, ALLOW_FULL_ONLY,
                    "startActivityAndWait", null);
            // TODO: Switch to user app stacks here.
            mAm.getActivityStartController().obtainStarter(intent, "startActivityAndWait")
                    .setCaller(caller)
                    .setCallingPackage(callingPackage)
                    .setResolvedType(resolvedType)
                    .setResultTo(resultTo)
                    .setResultWho(resultWho)
                    .setRequestCode(requestCode)
                    .setStartFlags(startFlags)
                    .setActivityOptions(bOptions)
                    .setMayWait(userId)
                    .setProfilerInfo(profilerInfo)
                    .setWaitResult(res)
                    .execute();
        }
        return res;
    }

    @Override
    public final int startActivityWithConfig(IApplicationThread caller, String callingPackage,
            Intent intent, String resolvedType, IBinder resultTo, String resultWho, int requestCode,
            int startFlags, Configuration config, Bundle bOptions, int userId) {
        synchronized (mGlobalLock) {
            mAm.enforceNotIsolatedCaller("startActivityWithConfig");
            userId = mAm.mUserController.handleIncomingUser(Binder.getCallingPid(),
                    Binder.getCallingUid(), userId, false, ALLOW_FULL_ONLY,
                    "startActivityWithConfig", null);
            // TODO: Switch to user app stacks here.
            return mAm.getActivityStartController().obtainStarter(intent, "startActivityWithConfig")
                    .setCaller(caller)
                    .setCallingPackage(callingPackage)
                    .setResolvedType(resolvedType)
                    .setResultTo(resultTo)
                    .setResultWho(resultWho)
                    .setRequestCode(requestCode)
                    .setStartFlags(startFlags)
                    .setGlobalConfiguration(config)
                    .setActivityOptions(bOptions)
                    .setMayWait(userId)
                    .execute();
        }
    }

    @Override
    public final int startActivityAsCaller(IApplicationThread caller, String callingPackage,
            Intent intent, String resolvedType, IBinder resultTo, String resultWho, int requestCode,
            int startFlags, ProfilerInfo profilerInfo, Bundle bOptions, boolean ignoreTargetSecurity,
            int userId) {

        // This is very dangerous -- it allows you to perform a start activity (including
        // permission grants) as any app that may launch one of your own activities.  So
        // we will only allow this to be done from activities that are part of the core framework,
        // and then only when they are running as the system.
        final ActivityRecord sourceRecord;
        final int targetUid;
        final String targetPackage;
        final boolean isResolver;
        synchronized (mGlobalLock) {
            if (resultTo == null) {
                throw new SecurityException("Must be called from an activity");
            }
            sourceRecord = mStackSupervisor.isInAnyStackLocked(resultTo);
            if (sourceRecord == null) {
                throw new SecurityException("Called with bad activity token: " + resultTo);
            }
            if (!sourceRecord.info.packageName.equals("android")) {
                throw new SecurityException(
                        "Must be called from an activity that is declared in the android package");
            }
            if (sourceRecord.app == null) {
                throw new SecurityException("Called without a process attached to activity");
            }
            if (UserHandle.getAppId(sourceRecord.app.uid) != SYSTEM_UID) {
                // This is still okay, as long as this activity is running under the
                // uid of the original calling activity.
                if (sourceRecord.app.uid != sourceRecord.launchedFromUid) {
                    throw new SecurityException(
                            "Calling activity in uid " + sourceRecord.app.uid
                                    + " must be system uid or original calling uid "
                                    + sourceRecord.launchedFromUid);
                }
            }
            if (ignoreTargetSecurity) {
                if (intent.getComponent() == null) {
                    throw new SecurityException(
                            "Component must be specified with ignoreTargetSecurity");
                }
                if (intent.getSelector() != null) {
                    throw new SecurityException(
                            "Selector not allowed with ignoreTargetSecurity");
                }
            }
            targetUid = sourceRecord.launchedFromUid;
            targetPackage = sourceRecord.launchedFromPackage;
            isResolver = sourceRecord.isResolverOrChildActivity();
        }

        if (userId == UserHandle.USER_NULL) {
            userId = UserHandle.getUserId(sourceRecord.app.uid);
        }

        // TODO: Switch to user app stacks here.
        try {
            return mAm.getActivityStartController().obtainStarter(intent, "startActivityAsCaller")
                    .setCallingUid(targetUid)
                    .setCallingPackage(targetPackage)
                    .setResolvedType(resolvedType)
                    .setResultTo(resultTo)
                    .setResultWho(resultWho)
                    .setRequestCode(requestCode)
                    .setStartFlags(startFlags)
                    .setActivityOptions(bOptions)
                    .setMayWait(userId)
                    .setIgnoreTargetSecurity(ignoreTargetSecurity)
                    .setFilterCallingUid(isResolver ? 0 /* system */ : targetUid)
                    .execute();
        } catch (SecurityException e) {
            // XXX need to figure out how to propagate to original app.
            // A SecurityException here is generally actually a fault of the original
            // calling activity (such as a fairly granting permissions), so propagate it
            // back to them.
            /*
            StringBuilder msg = new StringBuilder();
            msg.append("While launching");
            msg.append(intent.toString());
            msg.append(": ");
            msg.append(e.getMessage());
            */
            throw e;
        }
    }

    @Override
    public int startVoiceActivity(String callingPackage, int callingPid, int callingUid,
            Intent intent, String resolvedType, IVoiceInteractionSession session,
            IVoiceInteractor interactor, int startFlags, ProfilerInfo profilerInfo,
            Bundle bOptions, int userId) {
        mAm.enforceCallingPermission(BIND_VOICE_INTERACTION, "startVoiceActivity()");
        if (session == null || interactor == null) {
            throw new NullPointerException("null session or interactor");
        }
        userId = mAm.mUserController.handleIncomingUser(callingPid, callingUid, userId, false,
                ALLOW_FULL_ONLY, "startVoiceActivity", null);
        // TODO: Switch to user app stacks here.
        return mAm.getActivityStartController().obtainStarter(intent, "startVoiceActivity")
                .setCallingUid(callingUid)
                .setCallingPackage(callingPackage)
                .setResolvedType(resolvedType)
                .setVoiceSession(session)
                .setVoiceInteractor(interactor)
                .setStartFlags(startFlags)
                .setProfilerInfo(profilerInfo)
                .setActivityOptions(bOptions)
                .setMayWait(userId)
                .execute();
    }

    @Override
    public int startAssistantActivity(String callingPackage, int callingPid, int callingUid,
            Intent intent, String resolvedType, Bundle bOptions, int userId) {
        mAm.enforceCallingPermission(BIND_VOICE_INTERACTION, "startAssistantActivity()");
        userId = mAm.mUserController.handleIncomingUser(callingPid, callingUid, userId, false,
                ALLOW_FULL_ONLY, "startAssistantActivity", null);

        return mAm.getActivityStartController().obtainStarter(intent, "startAssistantActivity")
                .setCallingUid(callingUid)
                .setCallingPackage(callingPackage)
                .setResolvedType(resolvedType)
                .setActivityOptions(bOptions)
                .setMayWait(userId)
                .execute();
    }

    @Override
    public void startRecentsActivity(Intent intent, IAssistDataReceiver assistDataReceiver,
            IRecentsAnimationRunner recentsAnimationRunner) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "startRecentsActivity()");
        final int callingPid = Binder.getCallingPid();
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                final ComponentName recentsComponent = mRecentTasks.getRecentsComponent();
                final int recentsUid = mRecentTasks.getRecentsComponentUid();

                // Start a new recents animation
                final RecentsAnimation anim = new RecentsAnimation(mAm, mStackSupervisor,
                        mAm.getActivityStartController(), mAm.mWindowManager, mAm.mUserController,
                        callingPid);
                anim.startRecentsActivity(intent, recentsAnimationRunner, recentsComponent,
                        recentsUid, assistDataReceiver);
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    @Override
    public final int startActivityFromRecents(int taskId, Bundle bOptions) {
        mAm.enforceCallerIsRecentsOrHasPermission(START_TASKS_FROM_RECENTS,
                "startActivityFromRecents()");

        final int callingPid = Binder.getCallingPid();
        final int callingUid = Binder.getCallingUid();
        final SafeActivityOptions safeOptions = SafeActivityOptions.fromBundle(bOptions);
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                return mStackSupervisor.startActivityFromRecents(callingPid, callingUid, taskId,
                        safeOptions);
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    /**
     * This is the internal entry point for handling Activity.finish().
     *
     * @param token The Binder token referencing the Activity we want to finish.
     * @param resultCode Result code, if any, from this Activity.
     * @param resultData Result data (Intent), if any, from this Activity.
     * @param finishTask Whether to finish the task associated with this Activity.
     *
     * @return Returns true if the activity successfully finished, or false if it is still running.
     */
    @Override
    public final boolean finishActivity(IBinder token, int resultCode, Intent resultData,
            int finishTask) {
        // Refuse possible leaked file descriptors
        if (resultData != null && resultData.hasFileDescriptors()) {
            throw new IllegalArgumentException("File descriptors passed in Intent");
        }

        synchronized (mGlobalLock) {
            ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                return true;
            }
            // Keep track of the root activity of the task before we finish it
            TaskRecord tr = r.getTask();
            ActivityRecord rootR = tr.getRootActivity();
            if (rootR == null) {
                Slog.w(TAG, "Finishing task with all activities already finished");
            }
            // Do not allow task to finish if last task in lockTask mode. Launchable priv-apps can
            // finish.
            if (getLockTaskController().activityBlockedFromFinish(r)) {
                return false;
            }

            if (mAm.mController != null) {
                // Find the first activity that is not finishing.
                ActivityRecord next = r.getStack().topRunningActivityLocked(token, 0);
                if (next != null) {
                    // ask watcher if this is allowed
                    boolean resumeOK = true;
                    try {
                        resumeOK = mAm.mController.activityResuming(next.packageName);
                    } catch (RemoteException e) {
                        mAm.mController = null;
                        Watchdog.getInstance().setActivityController(null);
                    }

                    if (!resumeOK) {
                        Slog.i(TAG, "Not finishing activity because controller resumed");
                        return false;
                    }
                }
            }
            final long origId = Binder.clearCallingIdentity();
            try {
                boolean res;
                final boolean finishWithRootActivity =
                        finishTask == Activity.FINISH_TASK_WITH_ROOT_ACTIVITY;
                if (finishTask == Activity.FINISH_TASK_WITH_ACTIVITY
                        || (finishWithRootActivity && r == rootR)) {
                    // If requested, remove the task that is associated to this activity only if it
                    // was the root activity in the task. The result code and data is ignored
                    // because we don't support returning them across task boundaries. Also, to
                    // keep backwards compatibility we remove the task from recents when finishing
                    // task with root activity.
                    res = mStackSupervisor.removeTaskByIdLocked(tr.taskId, false,
                            finishWithRootActivity, "finish-activity");
                    if (!res) {
                        Slog.i(TAG, "Removing task failed to finish activity");
                    }
                } else {
                    res = tr.getStack().requestFinishActivityLocked(token, resultCode,
                            resultData, "app-request", true);
                    if (!res) {
                        Slog.i(TAG, "Failed to finish by app-request");
                    }
                }
                return res;
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    @Override
    public boolean finishActivityAffinity(IBinder token) {
        synchronized (mGlobalLock) {
            final long origId = Binder.clearCallingIdentity();
            try {
                ActivityRecord r = ActivityRecord.isInStackLocked(token);
                if (r == null) {
                    return false;
                }

                // Do not allow task to finish if last task in lockTask mode. Launchable priv-apps
                // can finish.
                final TaskRecord task = r.getTask();
                if (getLockTaskController().activityBlockedFromFinish(r)) {
                    return false;
                }
                return task.getStack().finishActivityAffinityLocked(r);
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    @Override
    public final void activityIdle(IBinder token, Configuration config, boolean stopProfiling) {
        final long origId = Binder.clearCallingIdentity();
        synchronized (mGlobalLock) {
            ActivityStack stack = ActivityRecord.getStackLocked(token);
            if (stack != null) {
                ActivityRecord r =
                        mStackSupervisor.activityIdleInternalLocked(token, false /* fromTimeout */,
                                false /* processPausingActivities */, config);
                if (stopProfiling) {
                    if ((mAm.mProfileProc == r.app) && mAm.mProfilerInfo != null) {
                        mAm.clearProfilerLocked();
                    }
                }
            }
        }
        Binder.restoreCallingIdentity(origId);
    }

    @Override
    public final void activityResumed(IBinder token) {
        final long origId = Binder.clearCallingIdentity();
        synchronized (mGlobalLock) {
            ActivityRecord.activityResumedLocked(token);
            mAm.mWindowManager.notifyAppResumedFinished(token);
        }
        Binder.restoreCallingIdentity(origId);
    }

    @Override
    public final void activityPaused(IBinder token) {
        final long origId = Binder.clearCallingIdentity();
        synchronized (mGlobalLock) {
            ActivityStack stack = ActivityRecord.getStackLocked(token);
            if (stack != null) {
                stack.activityPausedLocked(token, false);
            }
        }
        Binder.restoreCallingIdentity(origId);
    }

    @Override
    public final void activityStopped(IBinder token, Bundle icicle,
            PersistableBundle persistentState, CharSequence description) {
        if (DEBUG_ALL) Slog.v(TAG, "Activity stopped: token=" + token);

        // Refuse possible leaked file descriptors
        if (icicle != null && icicle.hasFileDescriptors()) {
            throw new IllegalArgumentException("File descriptors passed in Bundle");
        }

        final long origId = Binder.clearCallingIdentity();

        synchronized (mGlobalLock) {
            final ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r != null) {
                r.activityStoppedLocked(icicle, persistentState, description);
            }
        }

        mAm.trimApplications();

        Binder.restoreCallingIdentity(origId);
    }

    @Override
    public final void activityDestroyed(IBinder token) {
        if (DEBUG_SWITCH) Slog.v(TAG_SWITCH, "ACTIVITY DESTROYED: " + token);
        synchronized (mGlobalLock) {
            ActivityStack stack = ActivityRecord.getStackLocked(token);
            if (stack != null) {
                stack.activityDestroyedLocked(token, "activityDestroyed");
            }
        }
    }

    @Override
    public final void activityRelaunched(IBinder token) {
        final long origId = Binder.clearCallingIdentity();
        synchronized (mGlobalLock) {
            mStackSupervisor.activityRelaunchedLocked(token);
        }
        Binder.restoreCallingIdentity(origId);
    }

    public final void activitySlept(IBinder token) {
        if (DEBUG_ALL) Slog.v(TAG, "Activity slept: token=" + token);

        final long origId = Binder.clearCallingIdentity();

        synchronized (mGlobalLock) {
            final ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r != null) {
                mStackSupervisor.activitySleptLocked(r);
            }
        }

        Binder.restoreCallingIdentity(origId);
    }

    @Override
    public void setRequestedOrientation(IBinder token, int requestedOrientation) {
        synchronized (mGlobalLock) {
            ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                return;
            }
            final long origId = Binder.clearCallingIdentity();
            try {
                r.setRequestedOrientation(requestedOrientation);
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    @Override
    public int getRequestedOrientation(IBinder token) {
        synchronized (mGlobalLock) {
            ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                return ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
            }
            return r.getRequestedOrientation();
        }
    }

    @Override
    public void setImmersive(IBinder token, boolean immersive) {
        synchronized (mGlobalLock) {
            final ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                throw new IllegalArgumentException();
            }
            r.immersive = immersive;

            // update associated state if we're frontmost
            if (r == mStackSupervisor.getResumedActivityLocked()) {
                if (DEBUG_IMMERSIVE) Slog.d(TAG_IMMERSIVE, "Frontmost changed immersion: "+ r);
                mAm.applyUpdateLockStateLocked(r);
            }
        }
    }

    @Override
    public boolean isImmersive(IBinder token) {
        synchronized (mGlobalLock) {
            final ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                throw new IllegalArgumentException();
            }
            return r.immersive;
        }
    }

    @Override
    public boolean isTopActivityImmersive() {
        mAm.enforceNotIsolatedCaller("isTopActivityImmersive");
        synchronized (mGlobalLock) {
            final ActivityRecord r = mAm.getFocusedStack().topRunningActivityLocked();
            return (r != null) ? r.immersive : false;
        }
    }

    @Override
    public void overridePendingTransition(IBinder token, String packageName,
            int enterAnim, int exitAnim) {
        synchronized (mGlobalLock) {
            ActivityRecord self = ActivityRecord.isInStackLocked(token);
            if (self == null) {
                return;
            }

            final long origId = Binder.clearCallingIdentity();

            if (self.isState(
                    ActivityStack.ActivityState.RESUMED, ActivityStack.ActivityState.PAUSING)) {
                mAm.mWindowManager.overridePendingAppTransition(packageName,
                        enterAnim, exitAnim, null);
            }

            Binder.restoreCallingIdentity(origId);
        }
    }

    @Override
    public int getFrontActivityScreenCompatMode() {
        mAm.enforceNotIsolatedCaller("getFrontActivityScreenCompatMode");
        synchronized (mGlobalLock) {
            return mAm.mCompatModePackages.getFrontActivityScreenCompatModeLocked();
        }
    }

    @Override
    public void setFrontActivityScreenCompatMode(int mode) {
        mAm.enforceCallingPermission(android.Manifest.permission.SET_SCREEN_COMPATIBILITY,
                "setFrontActivityScreenCompatMode");
        synchronized (mGlobalLock) {
            mAm.mCompatModePackages.setFrontActivityScreenCompatModeLocked(mode);
        }
    }

    @Override
    public int getLaunchedFromUid(IBinder activityToken) {
        ActivityRecord srec;
        synchronized (mGlobalLock) {
            srec = ActivityRecord.forTokenLocked(activityToken);
        }
        if (srec == null) {
            return -1;
        }
        return srec.launchedFromUid;
    }

    @Override
    public String getLaunchedFromPackage(IBinder activityToken) {
        ActivityRecord srec;
        synchronized (mGlobalLock) {
            srec = ActivityRecord.forTokenLocked(activityToken);
        }
        if (srec == null) {
            return null;
        }
        return srec.launchedFromPackage;
    }

    @Override
    public boolean convertFromTranslucent(IBinder token) {
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                final ActivityRecord r = ActivityRecord.isInStackLocked(token);
                if (r == null) {
                    return false;
                }
                final boolean translucentChanged = r.changeWindowTranslucency(true);
                if (translucentChanged) {
                    mStackSupervisor.ensureActivitiesVisibleLocked(null, 0, !PRESERVE_WINDOWS);
                }
                mAm.mWindowManager.setAppFullscreen(token, true);
                return translucentChanged;
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    @Override
    public boolean convertToTranslucent(IBinder token, Bundle options) {
        SafeActivityOptions safeOptions = SafeActivityOptions.fromBundle(options);
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                final ActivityRecord r = ActivityRecord.isInStackLocked(token);
                if (r == null) {
                    return false;
                }
                final TaskRecord task = r.getTask();
                int index = task.mActivities.lastIndexOf(r);
                if (index > 0) {
                    ActivityRecord under = task.mActivities.get(index - 1);
                    under.returningOptions = safeOptions != null ? safeOptions.getOptions(r) : null;
                }
                final boolean translucentChanged = r.changeWindowTranslucency(false);
                if (translucentChanged) {
                    r.getStack().convertActivityToTranslucent(r);
                }
                mStackSupervisor.ensureActivitiesVisibleLocked(null, 0, !PRESERVE_WINDOWS);
                mAm.mWindowManager.setAppFullscreen(token, false);
                return translucentChanged;
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    @Override
    public void notifyActivityDrawn(IBinder token) {
        if (DEBUG_VISIBILITY) Slog.d(TAG_VISIBILITY, "notifyActivityDrawn: token=" + token);
        synchronized (mGlobalLock) {
            ActivityRecord r = mStackSupervisor.isInAnyStackLocked(token);
            if (r != null) {
                r.getStack().notifyActivityDrawnLocked(r);
            }
        }
    }

    @Override
    public void reportActivityFullyDrawn(IBinder token, boolean restoredFromBundle) {
        synchronized (mGlobalLock) {
            ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                return;
            }
            r.reportFullyDrawnLocked(restoredFromBundle);
        }
    }

    @Override
    public int getActivityDisplayId(IBinder activityToken) throws RemoteException {
        synchronized (mGlobalLock) {
            final ActivityStack stack = ActivityRecord.getStackLocked(activityToken);
            if (stack != null && stack.mDisplayId != INVALID_DISPLAY) {
                return stack.mDisplayId;
            }
            return DEFAULT_DISPLAY;
        }
    }

    @Override
    public ActivityManager.StackInfo getFocusedStackInfo() throws RemoteException {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "getStackInfo()");
        long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                ActivityStack focusedStack = mAm.getFocusedStack();
                if (focusedStack != null) {
                    return mStackSupervisor.getStackInfo(focusedStack.mStackId);
                }
                return null;
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public void setFocusedStack(int stackId) {
        mAm.enforceCallingPermission(MANAGE_ACTIVITY_STACKS, "setFocusedStack()");
        if (DEBUG_FOCUS) Slog.d(TAG_FOCUS, "setFocusedStack: stackId=" + stackId);
        final long callingId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                final ActivityStack stack = mStackSupervisor.getStack(stackId);
                if (stack == null) {
                    Slog.w(TAG, "setFocusedStack: No stack with id=" + stackId);
                    return;
                }
                final ActivityRecord r = stack.topRunningActivityLocked();
                if (mStackSupervisor.moveFocusableActivityStackToFrontLocked(
                        r, "setFocusedStack")) {
                    mStackSupervisor.resumeFocusedStackTopActivityLocked();
                }
            }
        } finally {
            Binder.restoreCallingIdentity(callingId);
        }
    }

    @Override
    public void setFocusedTask(int taskId) {
        mAm.enforceCallingPermission(MANAGE_ACTIVITY_STACKS, "setFocusedTask()");
        if (DEBUG_FOCUS) Slog.d(TAG_FOCUS, "setFocusedTask: taskId=" + taskId);
        final long callingId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                final TaskRecord task = mStackSupervisor.anyTaskForIdLocked(taskId);
                if (task == null) {
                    return;
                }
                final ActivityRecord r = task.topRunningActivityLocked();
                if (mStackSupervisor.moveFocusableActivityStackToFrontLocked(r, "setFocusedTask")) {
                    mStackSupervisor.resumeFocusedStackTopActivityLocked();
                }
            }
        } finally {
            Binder.restoreCallingIdentity(callingId);
        }
    }

    @Override
    public boolean removeTask(int taskId) {
        mAm.enforceCallerIsRecentsOrHasPermission(REMOVE_TASKS, "removeTask()");
        synchronized (mGlobalLock) {
            final long ident = Binder.clearCallingIdentity();
            try {
                return mStackSupervisor.removeTaskByIdLocked(taskId, true, REMOVE_FROM_RECENTS,
                        "remove-task");
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    @Override
    public boolean shouldUpRecreateTask(IBinder token, String destAffinity) {
        synchronized (mGlobalLock) {
            final ActivityRecord srec = ActivityRecord.forTokenLocked(token);
            if (srec != null) {
                return srec.getStack().shouldUpRecreateTaskLocked(srec, destAffinity);
            }
        }
        return false;
    }

    @Override
    public boolean navigateUpTo(IBinder token, Intent destIntent, int resultCode,
            Intent resultData) {

        synchronized (mGlobalLock) {
            final ActivityRecord r = ActivityRecord.forTokenLocked(token);
            if (r != null) {
                return r.getStack().navigateUpToLocked(r, destIntent, resultCode, resultData);
            }
            return false;
        }
    }

    /**
     * Attempts to move a task backwards in z-order (the order of activities within the task is
     * unchanged).
     *
     * There are several possible results of this call:
     * - if the task is locked, then we will show the lock toast
     * - if there is a task behind the provided task, then that task is made visible and resumed as
     *   this task is moved to the back
     * - otherwise, if there are no other tasks in the stack:
     *     - if this task is in the pinned stack, then we remove the stack completely, which will
     *       have the effect of moving the task to the top or bottom of the fullscreen stack
     *       (depending on whether it is visible)
     *     - otherwise, we simply return home and hide this task
     *
     * @param token A reference to the activity we wish to move
     * @param nonRoot If false then this only works if the activity is the root
     *                of a task; if true it will work for any activity in a task.
     * @return Returns true if the move completed, false if not.
     */
    @Override
    public boolean moveActivityTaskToBack(IBinder token, boolean nonRoot) {
        mAm.enforceNotIsolatedCaller("moveActivityTaskToBack");
        synchronized (mGlobalLock) {
            final long origId = Binder.clearCallingIdentity();
            try {
                int taskId = ActivityRecord.getTaskForActivityLocked(token, !nonRoot);
                final TaskRecord task = mStackSupervisor.anyTaskForIdLocked(taskId);
                if (task != null) {
                    return ActivityRecord.getStackLocked(token).moveTaskToBackLocked(taskId);
                }
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
        return false;
    }

    @Override
    public Rect getTaskBounds(int taskId) {
        mAm.enforceCallingPermission(MANAGE_ACTIVITY_STACKS, "getTaskBounds()");
        long ident = Binder.clearCallingIdentity();
        Rect rect = new Rect();
        try {
            synchronized (mGlobalLock) {
                final TaskRecord task = mStackSupervisor.anyTaskForIdLocked(taskId,
                        MATCH_TASK_IN_STACKS_OR_RECENT_TASKS);
                if (task == null) {
                    Slog.w(TAG, "getTaskBounds: taskId=" + taskId + " not found");
                    return rect;
                }
                if (task.getStack() != null) {
                    // Return the bounds from window manager since it will be adjusted for various
                    // things like the presense of a docked stack for tasks that aren't resizeable.
                    task.getWindowContainerBounds(rect);
                } else {
                    // Task isn't in window manager yet since it isn't associated with a stack.
                    // Return the persist value from activity manager
                    if (!task.matchParentBounds()) {
                        rect.set(task.getBounds());
                    } else if (task.mLastNonFullscreenBounds != null) {
                        rect.set(task.mLastNonFullscreenBounds);
                    }
                }
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
        return rect;
    }

    @Override
    public ActivityManager.TaskDescription getTaskDescription(int id) {
        synchronized (mGlobalLock) {
            mAm.enforceCallerIsRecentsOrHasPermission(
                    MANAGE_ACTIVITY_STACKS, "getTaskDescription()");
            final TaskRecord tr = mStackSupervisor.anyTaskForIdLocked(id,
                    MATCH_TASK_IN_STACKS_OR_RECENT_TASKS);
            if (tr != null) {
                return tr.lastTaskDescription;
            }
        }
        return null;
    }

    @Override
    public void setTaskWindowingMode(int taskId, int windowingMode, boolean toTop) {
        if (windowingMode == WINDOWING_MODE_SPLIT_SCREEN_PRIMARY) {
            setTaskWindowingModeSplitScreenPrimary(taskId, SPLIT_SCREEN_CREATE_MODE_TOP_OR_LEFT,
                    toTop, ANIMATE, null /* initialBounds */, true /* showRecents */);
            return;
        }
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "setTaskWindowingMode()");
        synchronized (mGlobalLock) {
            final long ident = Binder.clearCallingIdentity();
            try {
                final TaskRecord task = mStackSupervisor.anyTaskForIdLocked(taskId);
                if (task == null) {
                    Slog.w(TAG, "setTaskWindowingMode: No task for id=" + taskId);
                    return;
                }

                if (DEBUG_STACK) Slog.d(TAG_STACK, "setTaskWindowingMode: moving task=" + taskId
                        + " to windowingMode=" + windowingMode + " toTop=" + toTop);

                if (!task.isActivityTypeStandardOrUndefined()) {
                    throw new IllegalArgumentException("setTaskWindowingMode: Attempt to move"
                            + " non-standard task " + taskId + " to windowing mode="
                            + windowingMode);
                }

                final ActivityStack stack = task.getStack();
                if (toTop) {
                    stack.moveToFront("setTaskWindowingMode", task);
                }
                stack.setWindowingMode(windowingMode);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    @Override
    public String getCallingPackage(IBinder token) {
        synchronized (this) {
            ActivityRecord r = getCallingRecordLocked(token);
            return r != null ? r.info.packageName : null;
        }
    }

    @Override
    public ComponentName getCallingActivity(IBinder token) {
        synchronized (this) {
            ActivityRecord r = getCallingRecordLocked(token);
            return r != null ? r.intent.getComponent() : null;
        }
    }

    private ActivityRecord getCallingRecordLocked(IBinder token) {
        ActivityRecord r = ActivityRecord.isInStackLocked(token);
        if (r == null) {
            return null;
        }
        return r.resultTo;
    }

    @Override
    public void unhandledBack() {
        mAm.enforceCallingPermission(android.Manifest.permission.FORCE_BACK, "unhandledBack()");

        synchronized (mGlobalLock) {
            final long origId = Binder.clearCallingIdentity();
            try {
                mAm.getFocusedStack().unhandledBackLocked();
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    /**
     * TODO: Add mController hook
     */
    @Override
    public void moveTaskToFront(int taskId, int flags, Bundle bOptions) {
        mAm.enforceCallingPermission(android.Manifest.permission.REORDER_TASKS, "moveTaskToFront()");

        if (DEBUG_STACK) Slog.d(TAG_STACK, "moveTaskToFront: moving taskId=" + taskId);
        synchronized (mGlobalLock) {
            moveTaskToFrontLocked(taskId, flags, SafeActivityOptions.fromBundle(bOptions),
                    false /* fromRecents */);
        }
    }

    void moveTaskToFrontLocked(int taskId, int flags, SafeActivityOptions options,
            boolean fromRecents) {

        if (!mAm.checkAppSwitchAllowedLocked(Binder.getCallingPid(),
                Binder.getCallingUid(), -1, -1, "Task to front")) {
            SafeActivityOptions.abort(options);
            return;
        }
        final long origId = Binder.clearCallingIdentity();
        try {
            final TaskRecord task = mStackSupervisor.anyTaskForIdLocked(taskId);
            if (task == null) {
                Slog.d(TAG, "Could not find task for id: "+ taskId);
                return;
            }
            if (getLockTaskController().isLockTaskModeViolation(task)) {
                Slog.e(TAG, "moveTaskToFront: Attempt to violate Lock Task Mode");
                return;
            }
            ActivityOptions realOptions = options != null
                    ? options.getOptions(mStackSupervisor)
                    : null;
            mStackSupervisor.findTaskToMoveToFront(task, flags, realOptions, "moveTaskToFront",
                    false /* forceNonResizable */);

            final ActivityRecord topActivity = task.getTopActivity();
            if (topActivity != null) {

                // We are reshowing a task, use a starting window to hide the initial draw delay
                // so the transition can start earlier.
                topActivity.showStartingWindow(null /* prev */, false /* newTask */,
                        true /* taskSwitch */, fromRecents);
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
        SafeActivityOptions.abort(options);
    }

    @Override
    public int getTaskForActivity(IBinder token, boolean onlyRoot) {
        synchronized (mGlobalLock) {
            return ActivityRecord.getTaskForActivityLocked(token, onlyRoot);
        }
    }

    @Override
    public List<ActivityManager.RunningTaskInfo> getTasks(int maxNum) {
        return getFilteredTasks(maxNum, ACTIVITY_TYPE_UNDEFINED, WINDOWING_MODE_UNDEFINED);
    }

    @Override
    public List<ActivityManager.RunningTaskInfo> getFilteredTasks(int maxNum,
            @WindowConfiguration.ActivityType int ignoreActivityType,
            @WindowConfiguration.WindowingMode int ignoreWindowingMode) {
        final int callingUid = Binder.getCallingUid();
        ArrayList<ActivityManager.RunningTaskInfo> list = new ArrayList<>();

        synchronized (mGlobalLock) {
            if (DEBUG_ALL) Slog.v(TAG, "getTasks: max=" + maxNum);

            final boolean allowed = mAm.isGetTasksAllowed("getTasks", Binder.getCallingPid(),
                    callingUid);
            mStackSupervisor.getRunningTasks(maxNum, list, ignoreActivityType,
                    ignoreWindowingMode, callingUid, allowed);
        }

        return list;
    }

    @Override
    public final void finishSubActivity(IBinder token, String resultWho, int requestCode) {
        synchronized (mGlobalLock) {
            final long origId = Binder.clearCallingIdentity();
            ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r != null) {
                r.getStack().finishSubActivityLocked(r, resultWho, requestCode);
            }
            Binder.restoreCallingIdentity(origId);
        }
    }

    @Override
    public boolean willActivityBeVisible(IBinder token) {
        synchronized(this) {
            ActivityStack stack = ActivityRecord.getStackLocked(token);
            if (stack != null) {
                return stack.willActivityBeVisibleLocked(token);
            }
            return false;
        }
    }

    @Override
    public void moveTaskToStack(int taskId, int stackId, boolean toTop) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "moveTaskToStack()");
        synchronized (mGlobalLock) {
            final long ident = Binder.clearCallingIdentity();
            try {
                final TaskRecord task = mStackSupervisor.anyTaskForIdLocked(taskId);
                if (task == null) {
                    Slog.w(TAG, "moveTaskToStack: No task for id=" + taskId);
                    return;
                }

                if (DEBUG_STACK) Slog.d(TAG_STACK, "moveTaskToStack: moving task=" + taskId
                        + " to stackId=" + stackId + " toTop=" + toTop);

                final ActivityStack stack = mStackSupervisor.getStack(stackId);
                if (stack == null) {
                    throw new IllegalStateException(
                            "moveTaskToStack: No stack for stackId=" + stackId);
                }
                if (!stack.isActivityTypeStandardOrUndefined()) {
                    throw new IllegalArgumentException("moveTaskToStack: Attempt to move task "
                            + taskId + " to stack " + stackId);
                }
                if (stack.inSplitScreenPrimaryWindowingMode()) {
                    mAm.mWindowManager.setDockedStackCreateState(
                            SPLIT_SCREEN_CREATE_MODE_TOP_OR_LEFT, null /* initialBounds */);
                }
                task.reparent(stack, toTop, REPARENT_KEEP_STACK_AT_FRONT, ANIMATE, !DEFER_RESUME,
                        "moveTaskToStack");
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    @Override
    public void resizeStack(int stackId, Rect destBounds, boolean allowResizeInDockedMode,
            boolean preserveWindows, boolean animate, int animationDuration) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "resizeStack()");

        final long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                if (animate) {
                    final PinnedActivityStack stack = mStackSupervisor.getStack(stackId);
                    if (stack == null) {
                        Slog.w(TAG, "resizeStack: stackId " + stackId + " not found.");
                        return;
                    }
                    if (stack.getWindowingMode() != WINDOWING_MODE_PINNED) {
                        throw new IllegalArgumentException("Stack: " + stackId
                                + " doesn't support animated resize.");
                    }
                    stack.animateResizePinnedStack(null /* sourceHintBounds */, destBounds,
                            animationDuration, false /* fromFullscreen */);
                } else {
                    final ActivityStack stack = mStackSupervisor.getStack(stackId);
                    if (stack == null) {
                        Slog.w(TAG, "resizeStack: stackId " + stackId + " not found.");
                        return;
                    }
                    mStackSupervisor.resizeStackLocked(stack, destBounds,
                            null /* tempTaskBounds */, null /* tempTaskInsetBounds */,
                            preserveWindows, allowResizeInDockedMode, !DEFER_RESUME);
                }
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    /**
     * Moves the specified task to the primary-split-screen stack.
     *
     * @param taskId Id of task to move.
     * @param createMode The mode the primary split screen stack should be created in if it doesn't
     *                   exist already. See
     *                   {@link android.app.ActivityTaskManager#SPLIT_SCREEN_CREATE_MODE_TOP_OR_LEFT}
     *                   and
     *                   {@link android.app.ActivityTaskManager#SPLIT_SCREEN_CREATE_MODE_BOTTOM_OR_RIGHT}
     * @param toTop If the task and stack should be moved to the top.
     * @param animate Whether we should play an animation for the moving the task.
     * @param initialBounds If the primary stack gets created, it will use these bounds for the
     *                      stack. Pass {@code null} to use default bounds.
     * @param showRecents If the recents activity should be shown on the other side of the task
     *                    going into split-screen mode.
     */
    @Override
    public boolean setTaskWindowingModeSplitScreenPrimary(int taskId, int createMode,
            boolean toTop, boolean animate, Rect initialBounds, boolean showRecents) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS,
                "setTaskWindowingModeSplitScreenPrimary()");
        synchronized (mGlobalLock) {
            final long ident = Binder.clearCallingIdentity();
            try {
                final TaskRecord task = mStackSupervisor.anyTaskForIdLocked(taskId);
                if (task == null) {
                    Slog.w(TAG, "setTaskWindowingModeSplitScreenPrimary: No task for id=" + taskId);
                    return false;
                }
                if (DEBUG_STACK) Slog.d(TAG_STACK,
                        "setTaskWindowingModeSplitScreenPrimary: moving task=" + taskId
                                + " to createMode=" + createMode + " toTop=" + toTop);
                if (!task.isActivityTypeStandardOrUndefined()) {
                    throw new IllegalArgumentException("setTaskWindowingMode: Attempt to move"
                            + " non-standard task " + taskId + " to split-screen windowing mode");
                }

                mAm.mWindowManager.setDockedStackCreateState(createMode, initialBounds);
                final int windowingMode = task.getWindowingMode();
                final ActivityStack stack = task.getStack();
                if (toTop) {
                    stack.moveToFront("setTaskWindowingModeSplitScreenPrimary", task);
                }
                stack.setWindowingMode(WINDOWING_MODE_SPLIT_SCREEN_PRIMARY, animate, showRecents,
                        false /* enteringSplitScreenMode */, false /* deferEnsuringVisibility */);
                return windowingMode != task.getWindowingMode();
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    /**
     * Removes stacks in the input windowing modes from the system if they are of activity type
     * ACTIVITY_TYPE_STANDARD or ACTIVITY_TYPE_UNDEFINED
     */
    @Override
    public void removeStacksInWindowingModes(int[] windowingModes) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS,
                "removeStacksInWindowingModes()");

        synchronized (mGlobalLock) {
            final long ident = Binder.clearCallingIdentity();
            try {
                mStackSupervisor.removeStacksInWindowingModes(windowingModes);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    @Override
    public void removeStacksWithActivityTypes(int[] activityTypes) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS,
                "removeStacksWithActivityTypes()");

        synchronized (mGlobalLock) {
            final long ident = Binder.clearCallingIdentity();
            try {
                mStackSupervisor.removeStacksWithActivityTypes(activityTypes);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    @Override
    public ParceledListSlice<ActivityManager.RecentTaskInfo> getRecentTasks(int maxNum, int flags,
            int userId) {
        final int callingUid = Binder.getCallingUid();
        userId = mAm.mUserController.handleIncomingUser(Binder.getCallingPid(), callingUid, userId,
                false, ALLOW_FULL_ONLY, "getRecentTasks", null);
        final boolean allowed = mAm.isGetTasksAllowed("getRecentTasks", Binder.getCallingPid(),
                callingUid);
        final boolean detailed = mAm.checkCallingPermission(
                android.Manifest.permission.GET_DETAILED_TASKS)
                == PackageManager.PERMISSION_GRANTED;

        synchronized (mGlobalLock) {
            return mRecentTasks.getRecentTasks(maxNum, flags, allowed, detailed, userId,
                    callingUid);
        }
    }

    @Override
    public List<ActivityManager.StackInfo> getAllStackInfos() {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "getAllStackInfos()");
        long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                return mStackSupervisor.getAllStackInfosLocked();
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public ActivityManager.StackInfo getStackInfo(int windowingMode, int activityType) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "getStackInfo()");
        long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                return mStackSupervisor.getStackInfo(windowingMode, activityType);
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public void cancelRecentsAnimation(boolean restoreHomeStackPosition) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "cancelRecentsAnimation()");
        final long callingUid = Binder.getCallingUid();
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                // Cancel the recents animation synchronously (do not hold the WM lock)
                mAm.mWindowManager.cancelRecentsAnimationSynchronously(restoreHomeStackPosition
                        ? REORDER_MOVE_TO_ORIGINAL_POSITION
                        : REORDER_KEEP_IN_PLACE, "cancelRecentsAnimation/uid=" + callingUid);
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    @Override
    public void startLockTaskModeByToken(IBinder token) {
        synchronized (mGlobalLock) {
            final ActivityRecord r = ActivityRecord.forTokenLocked(token);
            if (r == null) {
                return;
            }
            startLockTaskModeLocked(r.getTask(), false /* isSystemCaller */);
        }
    }

    @Override
    public void startSystemLockTaskMode(int taskId) throws RemoteException {
        mAm.enforceCallingPermission(MANAGE_ACTIVITY_STACKS, "startSystemLockTaskMode");
        // This makes inner call to look as if it was initiated by system.
        long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                final TaskRecord task = mStackSupervisor.anyTaskForIdLocked(taskId);

                // When starting lock task mode the stack must be in front and focused
                task.getStack().moveToFront("startSystemLockTaskMode");
                startLockTaskModeLocked(task, true /* isSystemCaller */);
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public void stopLockTaskModeByToken(IBinder token) {
        synchronized (mGlobalLock) {
            final ActivityRecord r = ActivityRecord.forTokenLocked(token);
            if (r == null) {
                return;
            }
            stopLockTaskModeInternal(r.getTask(), false /* isSystemCaller */);
        }
    }

    /**
     * This API should be called by SystemUI only when user perform certain action to dismiss
     * lock task mode. We should only dismiss pinned lock task mode in this case.
     */
    @Override
    public void stopSystemLockTaskMode() throws RemoteException {
        mAm.enforceCallingPermission(MANAGE_ACTIVITY_STACKS, "stopSystemLockTaskMode");
        stopLockTaskModeInternal(null, true /* isSystemCaller */);
    }

    private void startLockTaskModeLocked(@Nullable TaskRecord task, boolean isSystemCaller) {
        if (DEBUG_LOCKTASK) Slog.w(TAG_LOCKTASK, "startLockTaskModeLocked: " + task);
        if (task == null || task.mLockTaskAuth == LOCK_TASK_AUTH_DONT_LOCK) {
            return;
        }

        final ActivityStack stack = mStackSupervisor.getFocusedStack();
        if (stack == null || task != stack.topTask()) {
            throw new IllegalArgumentException("Invalid task, not in foreground");
        }

        // {@code isSystemCaller} is used to distinguish whether this request is initiated by the
        // system or a specific app.
        // * System-initiated requests will only start the pinned mode (screen pinning)
        // * App-initiated requests
        //   - will put the device in fully locked mode (LockTask), if the app is whitelisted
        //   - will start the pinned mode, otherwise
        final int callingUid = Binder.getCallingUid();
        long ident = Binder.clearCallingIdentity();
        try {
            // When a task is locked, dismiss the pinned stack if it exists
            mStackSupervisor.removeStacksInWindowingModes(WINDOWING_MODE_PINNED);

            getLockTaskController().startLockTaskMode(task, isSystemCaller, callingUid);
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    private void stopLockTaskModeInternal(@Nullable TaskRecord task, boolean isSystemCaller) {
        final int callingUid = Binder.getCallingUid();
        long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                getLockTaskController().stopLockTaskMode(task, isSystemCaller, callingUid);
            }
            // Launch in-call UI if a call is ongoing. This is necessary to allow stopping the lock
            // task and jumping straight into a call in the case of emergency call back.
            TelecomManager tm = (TelecomManager) mContext.getSystemService(Context.TELECOM_SERVICE);
            if (tm != null) {
                tm.showInCallScreen(false);
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public boolean isInLockTaskMode() {
        return getLockTaskModeState() != LOCK_TASK_MODE_NONE;
    }

    @Override
    public int getLockTaskModeState() {
        synchronized (mGlobalLock) {
            return getLockTaskController().getLockTaskModeState();
        }
    }

    @Override
    public void setTaskDescription(IBinder token, ActivityManager.TaskDescription td) {
        synchronized (mGlobalLock) {
            ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r != null) {
                r.setTaskDescription(td);
                final TaskRecord task = r.getTask();
                task.updateTaskDescription();
                mTaskChangeNotificationController.notifyTaskDescriptionChanged(task.taskId, td);
            }
        }
    }

    @Override
    public Bundle getActivityOptions(IBinder token) {
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                final ActivityRecord r = ActivityRecord.isInStackLocked(token);
                if (r != null) {
                    final ActivityOptions activityOptions = r.takeOptionsLocked();
                    return activityOptions == null ? null : activityOptions.toBundle();
                }
                return null;
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    @Override
    public List<IBinder> getAppTasks(String callingPackage) {
        int callingUid = Binder.getCallingUid();
        long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                return mRecentTasks.getAppTasksList(callingUid, callingPackage);
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public void finishVoiceTask(IVoiceInteractionSession session) {
        synchronized (mGlobalLock) {
            final long origId = Binder.clearCallingIdentity();
            try {
                // TODO: VI Consider treating local voice interactions and voice tasks
                // differently here
                mStackSupervisor.finishVoiceTask(session);
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }

    }

    @Override
    public boolean isTopOfTask(IBinder token) {
        synchronized (mGlobalLock) {
            ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                throw new IllegalArgumentException();
            }
            return r.getTask().getTopActivity() == r;
        }
    }

    @Override
    public void notifyLaunchTaskBehindComplete(IBinder token) {
        mStackSupervisor.scheduleLaunchTaskBehindComplete(token);
    }

    @Override
    public void notifyEnterAnimationComplete(IBinder token) {
        mH.post(() -> {
            synchronized (mGlobalLock) {
                ActivityRecord r = ActivityRecord.forTokenLocked(token);
                if (r != null && r.app != null && r.app.thread != null) {
                    try {
                        r.app.thread.scheduleEnterAnimationComplete(r.appToken);
                    } catch (RemoteException e) {
                    }
                }
            }

        });
    }

    /** Called from an app when assist data is ready. */
    @Override
    public void reportAssistContextExtras(IBinder token, Bundle extras, AssistStructure structure,
            AssistContent content, Uri referrer) {
        PendingAssistExtras pae = (PendingAssistExtras)token;
        synchronized (pae) {
            pae.result = extras;
            pae.structure = structure;
            pae.content = content;
            if (referrer != null) {
                pae.extras.putParcelable(Intent.EXTRA_REFERRER, referrer);
            }
            if (structure != null) {
                structure.setHomeActivity(pae.isHome);
            }
            pae.haveResult = true;
            pae.notifyAll();
            if (pae.intent == null && pae.receiver == null) {
                // Caller is just waiting for the result.
                return;
            }
        }
        // We are now ready to launch the assist activity.
        IAssistDataReceiver sendReceiver = null;
        Bundle sendBundle = null;
        synchronized (mGlobalLock) {
            buildAssistBundleLocked(pae, extras);
            boolean exists = mPendingAssistExtras.remove(pae);
            mAm.mUiHandler.removeCallbacks(pae);
            if (!exists) {
                // Timed out.
                return;
            }

            if ((sendReceiver=pae.receiver) != null) {
                // Caller wants result sent back to them.
                sendBundle = new Bundle();
                sendBundle.putBundle(ASSIST_KEY_DATA, pae.extras);
                sendBundle.putParcelable(ASSIST_KEY_STRUCTURE, pae.structure);
                sendBundle.putParcelable(ASSIST_KEY_CONTENT, pae.content);
                sendBundle.putBundle(ASSIST_KEY_RECEIVER_EXTRAS, pae.receiverExtras);
            }
        }
        if (sendReceiver != null) {
            try {
                sendReceiver.onHandleAssistData(sendBundle);
            } catch (RemoteException e) {
            }
            return;
        }

        final long ident = Binder.clearCallingIdentity();
        try {
            if (TextUtils.equals(pae.intent.getAction(),
                    android.service.voice.VoiceInteractionService.SERVICE_INTERFACE)) {
                pae.intent.putExtras(pae.extras);
                mContext.startServiceAsUser(pae.intent, new UserHandle(pae.userHandle));
            } else {
                pae.intent.replaceExtras(pae.extras);
                pae.intent.setFlags(FLAG_ACTIVITY_NEW_TASK
                        | Intent.FLAG_ACTIVITY_SINGLE_TOP
                        | Intent.FLAG_ACTIVITY_CLEAR_TOP);
                mAm.closeSystemDialogs("assist");

                try {
                    mContext.startActivityAsUser(pae.intent, new UserHandle(pae.userHandle));
                } catch (ActivityNotFoundException e) {
                    Slog.w(TAG, "No activity to handle assist action.", e);
                }
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public int addAppTask(IBinder activityToken, Intent intent,
            ActivityManager.TaskDescription description, Bitmap thumbnail) throws RemoteException {
        final int callingUid = Binder.getCallingUid();
        final long callingIdent = Binder.clearCallingIdentity();

        try {
            synchronized (mGlobalLock) {
                ActivityRecord r = ActivityRecord.isInStackLocked(activityToken);
                if (r == null) {
                    throw new IllegalArgumentException("Activity does not exist; token="
                            + activityToken);
                }
                ComponentName comp = intent.getComponent();
                if (comp == null) {
                    throw new IllegalArgumentException("Intent " + intent
                            + " must specify explicit component");
                }
                if (thumbnail.getWidth() != mAm.mThumbnailWidth
                        || thumbnail.getHeight() != mAm.mThumbnailHeight) {
                    throw new IllegalArgumentException("Bad thumbnail size: got "
                            + thumbnail.getWidth() + "x" + thumbnail.getHeight() + ", require "
                            + mAm.mThumbnailWidth + "x" + mAm.mThumbnailHeight);
                }
                if (intent.getSelector() != null) {
                    intent.setSelector(null);
                }
                if (intent.getSourceBounds() != null) {
                    intent.setSourceBounds(null);
                }
                if ((intent.getFlags()&Intent.FLAG_ACTIVITY_NEW_DOCUMENT) != 0) {
                    if ((intent.getFlags()&Intent.FLAG_ACTIVITY_RETAIN_IN_RECENTS) == 0) {
                        // The caller has added this as an auto-remove task...  that makes no
                        // sense, so turn off auto-remove.
                        intent.addFlags(Intent.FLAG_ACTIVITY_RETAIN_IN_RECENTS);
                    }
                }
                final ActivityInfo ainfo = AppGlobals.getPackageManager().getActivityInfo(comp,
                        STOCK_PM_FLAGS, UserHandle.getUserId(callingUid));
                if (ainfo.applicationInfo.uid != callingUid) {
                    throw new SecurityException(
                            "Can't add task for another application: target uid="
                                    + ainfo.applicationInfo.uid + ", calling uid=" + callingUid);
                }

                final ActivityStack stack = r.getStack();
                final TaskRecord task = stack.createTaskRecord(
                        mStackSupervisor.getNextTaskIdForUserLocked(r.userId), ainfo, intent,
                        null /* voiceSession */, null /* voiceInteractor */, !ON_TOP);
                if (!mRecentTasks.addToBottom(task)) {
                    // The app has too many tasks already and we can't add any more
                    stack.removeTask(task, "addAppTask", REMOVE_TASK_MODE_DESTROYING);
                    return INVALID_TASK_ID;
                }
                task.lastTaskDescription.copyFrom(description);

                // TODO: Send the thumbnail to WM to store it.

                return task.taskId;
            }
        } finally {
            Binder.restoreCallingIdentity(callingIdent);
        }
    }

    @Override
    public Point getAppTaskThumbnailSize() {
        synchronized (mGlobalLock) {
            return new Point(mAm.mThumbnailWidth,  mAm.mThumbnailHeight);
        }
    }

    @Override
    public void setTaskResizeable(int taskId, int resizeableMode) {
        synchronized (mGlobalLock) {
            final TaskRecord task = mStackSupervisor.anyTaskForIdLocked(
                    taskId, MATCH_TASK_IN_STACKS_OR_RECENT_TASKS);
            if (task == null) {
                Slog.w(TAG, "setTaskResizeable: taskId=" + taskId + " not found");
                return;
            }
            task.setResizeMode(resizeableMode);
        }
    }

    @Override
    public void resizeTask(int taskId, Rect bounds, int resizeMode) {
        mAm.enforceCallingPermission(MANAGE_ACTIVITY_STACKS, "resizeTask()");
        long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                TaskRecord task = mStackSupervisor.anyTaskForIdLocked(taskId);
                if (task == null) {
                    Slog.w(TAG, "resizeTask: taskId=" + taskId + " not found");
                    return;
                }
                // Place the task in the right stack if it isn't there already based on
                // the requested bounds.
                // The stack transition logic is:
                // - a null bounds on a freeform task moves that task to fullscreen
                // - a non-null bounds on a non-freeform (fullscreen OR docked) task moves
                //   that task to freeform
                // - otherwise the task is not moved
                ActivityStack stack = task.getStack();
                if (!task.getWindowConfiguration().canResizeTask()) {
                    throw new IllegalArgumentException("resizeTask not allowed on task=" + task);
                }
                if (bounds == null && stack.getWindowingMode() == WINDOWING_MODE_FREEFORM) {
                    stack = stack.getDisplay().getOrCreateStack(
                            WINDOWING_MODE_FULLSCREEN, stack.getActivityType(), ON_TOP);
                } else if (bounds != null && stack.getWindowingMode() != WINDOWING_MODE_FREEFORM) {
                    stack = stack.getDisplay().getOrCreateStack(
                            WINDOWING_MODE_FREEFORM, stack.getActivityType(), ON_TOP);
                }

                // Reparent the task to the right stack if necessary
                boolean preserveWindow = (resizeMode & RESIZE_MODE_PRESERVE_WINDOW) != 0;
                if (stack != task.getStack()) {
                    // Defer resume until the task is resized below
                    task.reparent(stack, ON_TOP, REPARENT_KEEP_STACK_AT_FRONT, ANIMATE,
                            DEFER_RESUME, "resizeTask");
                    preserveWindow = false;
                }

                // After reparenting (which only resizes the task to the stack bounds), resize the
                // task to the actual bounds provided
                task.resize(bounds, resizeMode, preserveWindow, !DEFER_RESUME);
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public boolean releaseActivityInstance(IBinder token) {
        synchronized (mGlobalLock) {
            final long origId = Binder.clearCallingIdentity();
            try {
                ActivityRecord r = ActivityRecord.isInStackLocked(token);
                if (r == null) {
                    return false;
                }
                return r.getStack().safelyDestroyActivityLocked(r, "app-req");
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    @Override
    public void releaseSomeActivities(IApplicationThread appInt) {
        synchronized (mGlobalLock) {
            final long origId = Binder.clearCallingIdentity();
            try {
                ProcessRecord app = mAm.getRecordForAppLocked(appInt);
                mStackSupervisor.releaseSomeActivitiesLocked(app, "low-mem");
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    @Override
    public void setLockScreenShown(boolean keyguardShowing, boolean aodShowing,
            int secondaryDisplayShowing) {
        if (mAm.checkCallingPermission(android.Manifest.permission.DEVICE_POWER)
                != PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Requires permission "
                    + android.Manifest.permission.DEVICE_POWER);
        }

        synchronized (mGlobalLock) {
            long ident = Binder.clearCallingIdentity();
            if (mKeyguardShown != keyguardShowing) {
                mKeyguardShown = keyguardShowing;
                reportCurKeyguardUsageEventLocked(keyguardShowing);
            }
            try {
                mKeyguardController.setKeyguardShown(keyguardShowing, aodShowing,
                        secondaryDisplayShowing);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }

        mAm.mHandler.obtainMessage(DISPATCH_SCREEN_KEYGUARD_MSG, keyguardShowing ? 1 : 0, 0)
                .sendToTarget();
    }

    @Override
    public Bitmap getTaskDescriptionIcon(String filePath, int userId) {
        userId = mAm.mUserController.handleIncomingUser(Binder.getCallingPid(),
                Binder.getCallingUid(), userId, false, ALLOW_FULL_ONLY, "getTaskDescriptionIcon", null);

        final File passedIconFile = new File(filePath);
        final File legitIconFile = new File(TaskPersister.getUserImagesDir(userId),
                passedIconFile.getName());
        if (!legitIconFile.getPath().equals(filePath)
                || !filePath.contains(ActivityRecord.ACTIVITY_ICON_SUFFIX)) {
            throw new IllegalArgumentException("Bad file path: " + filePath
                    + " passed for userId " + userId);
        }
        return mRecentTasks.getTaskDescriptionIcon(filePath);
    }

    @Override
    public void startInPlaceAnimationOnFrontMostApplication(Bundle opts)
            throws RemoteException {
        final SafeActivityOptions safeOptions = SafeActivityOptions.fromBundle(opts);
        final ActivityOptions activityOptions = safeOptions != null
                ? safeOptions.getOptions(mStackSupervisor)
                : null;
        if (activityOptions == null
                || activityOptions.getAnimationType() != ActivityOptions.ANIM_CUSTOM_IN_PLACE
                || activityOptions.getCustomInPlaceResId() == 0) {
            throw new IllegalArgumentException("Expected in-place ActivityOption " +
                    "with valid animation");
        }
        mAm.mWindowManager.prepareAppTransition(TRANSIT_TASK_IN_PLACE, false);
        mAm.mWindowManager.overridePendingAppTransitionInPlace(activityOptions.getPackageName(),
                activityOptions.getCustomInPlaceResId());
        mAm.mWindowManager.executeAppTransition();
    }

    @Override
    public void removeStack(int stackId) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "removeStack()");
        synchronized (mGlobalLock) {
            final long ident = Binder.clearCallingIdentity();
            try {
                final ActivityStack stack = mStackSupervisor.getStack(stackId);
                if (stack == null) {
                    Slog.w(TAG, "removeStack: No stack with id=" + stackId);
                    return;
                }
                if (!stack.isActivityTypeStandardOrUndefined()) {
                    throw new IllegalArgumentException(
                            "Removing non-standard stack is not allowed.");
                }
                mStackSupervisor.removeStack(stack);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    @Override
    public void moveStackToDisplay(int stackId, int displayId) {
        mAm.enforceCallingPermission(INTERNAL_SYSTEM_WINDOW, "moveStackToDisplay()");

        synchronized (mGlobalLock) {
            final long ident = Binder.clearCallingIdentity();
            try {
                if (DEBUG_STACK) Slog.d(TAG_STACK, "moveStackToDisplay: moving stackId=" + stackId
                        + " to displayId=" + displayId);
                mStackSupervisor.moveStackToDisplayLocked(stackId, displayId, ON_TOP);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    @Override
    public int createStackOnDisplay(int displayId) {
        mAm.enforceCallingPermission(MANAGE_ACTIVITY_STACKS, "createStackOnDisplay()");
        synchronized (mGlobalLock) {
            final ActivityDisplay display =
                    mStackSupervisor.getActivityDisplayOrCreateLocked(displayId);
            if (display == null) {
                return INVALID_STACK_ID;
            }
            // TODO(multi-display): Have the caller pass in the windowing mode and activity type.
            final ActivityStack stack = display.createStack(
                    WINDOWING_MODE_FULLSCREEN_OR_SPLIT_SCREEN_SECONDARY, ACTIVITY_TYPE_STANDARD,
                    ON_TOP);
            return (stack != null) ? stack.mStackId : INVALID_STACK_ID;
        }
    }

    @Override
    public void exitFreeformMode(IBinder token) {
        synchronized (mGlobalLock) {
            long ident = Binder.clearCallingIdentity();
            try {
                final ActivityRecord r = ActivityRecord.forTokenLocked(token);
                if (r == null) {
                    throw new IllegalArgumentException(
                            "exitFreeformMode: No activity record matching token=" + token);
                }

                final ActivityStack stack = r.getStack();
                if (stack == null || !stack.inFreeformWindowingMode()) {
                    throw new IllegalStateException(
                            "exitFreeformMode: You can only go fullscreen from freeform.");
                }

                stack.setWindowingMode(WINDOWING_MODE_FULLSCREEN);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    /** Sets the task stack listener that gets callbacks when a task stack changes. */
    @Override
    public void registerTaskStackListener(ITaskStackListener listener) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS,
                "registerTaskStackListener()");
        mTaskChangeNotificationController.registerTaskStackListener(listener);
    }

    /** Unregister a task stack listener so that it stops receiving callbacks. */
    @Override
    public void unregisterTaskStackListener(ITaskStackListener listener) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS,
                "unregisterTaskStackListener()");
        mTaskChangeNotificationController.unregisterTaskStackListener(listener);
    }

    private void reportCurKeyguardUsageEventLocked(boolean keyguardShowing) {
        mAm.reportGlobalUsageEventLocked(keyguardShowing
                ? UsageEvents.Event.KEYGUARD_SHOWN
                : UsageEvents.Event.KEYGUARD_HIDDEN);
    }

    @Override
    public boolean requestAssistContextExtras(int requestType, IAssistDataReceiver receiver,
            Bundle receiverExtras, IBinder activityToken, boolean focused, boolean newSessionId) {
        return enqueueAssistContext(requestType, null, null, receiver, receiverExtras,
                activityToken, focused, newSessionId, UserHandle.getCallingUserId(), null,
                PENDING_ASSIST_EXTRAS_LONG_TIMEOUT, 0) != null;
    }

    @Override
    public boolean requestAutofillData(IAssistDataReceiver receiver, Bundle receiverExtras,
            IBinder activityToken, int flags) {
        return enqueueAssistContext(ActivityManager.ASSIST_CONTEXT_AUTOFILL, null, null,
                receiver, receiverExtras, activityToken, true, true, UserHandle.getCallingUserId(),
                null, PENDING_AUTOFILL_ASSIST_STRUCTURE_TIMEOUT, flags) != null;
    }

    @Override
    public boolean launchAssistIntent(Intent intent, int requestType, String hint, int userHandle,
            Bundle args) {
        return enqueueAssistContext(requestType, intent, hint, null, null, null,
                true /* focused */, true /* newSessionId */, userHandle, args,
                PENDING_ASSIST_EXTRAS_TIMEOUT, 0) != null;
    }

    @Override
    public Bundle getAssistContextExtras(int requestType) {
        PendingAssistExtras pae = enqueueAssistContext(requestType, null, null, null,
                null, null, true /* focused */, true /* newSessionId */,
                UserHandle.getCallingUserId(), null, PENDING_ASSIST_EXTRAS_TIMEOUT, 0);
        if (pae == null) {
            return null;
        }
        synchronized (pae) {
            while (!pae.haveResult) {
                try {
                    pae.wait();
                } catch (InterruptedException e) {
                }
            }
        }
        synchronized (mGlobalLock) {
            buildAssistBundleLocked(pae, pae.result);
            mPendingAssistExtras.remove(pae);
            mAm.mUiHandler.removeCallbacks(pae);
        }
        return pae.extras;
    }

    private PendingAssistExtras enqueueAssistContext(int requestType, Intent intent, String hint,
            IAssistDataReceiver receiver, Bundle receiverExtras, IBinder activityToken,
            boolean focused, boolean newSessionId, int userHandle, Bundle args, long timeout,
            int flags) {
        mAm.enforceCallingPermission(android.Manifest.permission.GET_TOP_ACTIVITY_INFO,
                "enqueueAssistContext()");

        synchronized (mGlobalLock) {
            ActivityRecord activity = mAm.getFocusedStack().getTopActivity();
            if (activity == null) {
                Slog.w(TAG, "getAssistContextExtras failed: no top activity");
                return null;
            }
            if (activity.app == null || activity.app.thread == null) {
                Slog.w(TAG, "getAssistContextExtras failed: no process for " + activity);
                return null;
            }
            if (focused) {
                if (activityToken != null) {
                    ActivityRecord caller = ActivityRecord.forTokenLocked(activityToken);
                    if (activity != caller) {
                        Slog.w(TAG, "enqueueAssistContext failed: caller " + caller
                                + " is not current top " + activity);
                        return null;
                    }
                }
            } else {
                activity = ActivityRecord.forTokenLocked(activityToken);
                if (activity == null) {
                    Slog.w(TAG, "enqueueAssistContext failed: activity for token=" + activityToken
                            + " couldn't be found");
                    return null;
                }
                if (activity.app == null || activity.app.thread == null) {
                    Slog.w(TAG, "enqueueAssistContext failed: no process for " + activity);
                    return null;
                }
            }

            PendingAssistExtras pae;
            Bundle extras = new Bundle();
            if (args != null) {
                extras.putAll(args);
            }
            extras.putString(Intent.EXTRA_ASSIST_PACKAGE, activity.packageName);
            extras.putInt(Intent.EXTRA_ASSIST_UID, activity.app.uid);

            pae = new PendingAssistExtras(activity, extras, intent, hint, receiver, receiverExtras,
                    userHandle);
            pae.isHome = activity.isActivityTypeHome();

            // Increment the sessionId if necessary
            if (newSessionId) {
                mViSessionId++;
            }
            try {
                activity.app.thread.requestAssistContextExtras(activity.appToken, pae, requestType,
                        mViSessionId, flags);
                mPendingAssistExtras.add(pae);
                mAm.mUiHandler.postDelayed(pae, timeout);
            } catch (RemoteException e) {
                Slog.w(TAG, "getAssistContextExtras failed: crash calling " + activity);
                return null;
            }
            return pae;
        }
    }

    private void buildAssistBundleLocked(PendingAssistExtras pae, Bundle result) {
        if (result != null) {
            pae.extras.putBundle(Intent.EXTRA_ASSIST_CONTEXT, result);
        }
        if (pae.hint != null) {
            pae.extras.putBoolean(pae.hint, true);
        }
    }

    private void pendingAssistExtrasTimedOut(PendingAssistExtras pae) {
        IAssistDataReceiver receiver;
        synchronized (mGlobalLock) {
            mPendingAssistExtras.remove(pae);
            receiver = pae.receiver;
        }
        if (receiver != null) {
            // Caller wants result sent back to them.
            Bundle sendBundle = new Bundle();
            // At least return the receiver extras
            sendBundle.putBundle(ASSIST_KEY_RECEIVER_EXTRAS, pae.receiverExtras);
            try {
                pae.receiver.onHandleAssistData(sendBundle);
            } catch (RemoteException e) {
            }
        }
    }

    public class PendingAssistExtras extends Binder implements Runnable {
        public final ActivityRecord activity;
        public boolean isHome;
        public final Bundle extras;
        public final Intent intent;
        public final String hint;
        public final IAssistDataReceiver receiver;
        public final int userHandle;
        public boolean haveResult = false;
        public Bundle result = null;
        public AssistStructure structure = null;
        public AssistContent content = null;
        public Bundle receiverExtras;

        public PendingAssistExtras(ActivityRecord _activity, Bundle _extras, Intent _intent,
                String _hint, IAssistDataReceiver _receiver, Bundle _receiverExtras,
                int _userHandle) {
            activity = _activity;
            extras = _extras;
            intent = _intent;
            hint = _hint;
            receiver = _receiver;
            receiverExtras = _receiverExtras;
            userHandle = _userHandle;
        }

        @Override
        public void run() {
            Slog.w(TAG, "getAssistContextExtras failed: timeout retrieving from " + activity);
            synchronized (this) {
                haveResult = true;
                notifyAll();
            }
            pendingAssistExtrasTimedOut(this);
        }
    }

    @Override
    public boolean isAssistDataAllowedOnCurrentActivity() {
        int userId;
        synchronized (mGlobalLock) {
            final ActivityStack focusedStack = mAm.getFocusedStack();
            if (focusedStack == null || focusedStack.isActivityTypeAssistant()) {
                return false;
            }

            final ActivityRecord activity = focusedStack.getTopActivity();
            if (activity == null) {
                return false;
            }
            userId = activity.userId;
        }
        return !DevicePolicyCache.getInstance().getScreenCaptureDisabled(userId);
    }

    @Override
    public boolean showAssistFromActivity(IBinder token, Bundle args) {
        long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                ActivityRecord caller = ActivityRecord.forTokenLocked(token);
                ActivityRecord top = mAm.getFocusedStack().getTopActivity();
                if (top != caller) {
                    Slog.w(TAG, "showAssistFromActivity failed: caller " + caller
                            + " is not current top " + top);
                    return false;
                }
                if (!top.nowVisible) {
                    Slog.w(TAG, "showAssistFromActivity failed: caller " + caller
                            + " is not visible");
                    return false;
                }
            }
            return mAssistUtils.showSessionForActiveService(args, SHOW_SOURCE_APPLICATION, null,
                    token);
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public boolean isRootVoiceInteraction(IBinder token) {
        synchronized (mGlobalLock) {
            ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                return false;
            }
            return r.rootVoiceInteraction;
        }
    }

    @Override
    public ComponentName getActivityClassForToken(IBinder token) {
        synchronized (mGlobalLock) {
            ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                return null;
            }
            return r.intent.getComponent();
        }
    }

    @Override
    public String getPackageForToken(IBinder token) {
        synchronized (mGlobalLock) {
            ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                return null;
            }
            return r.packageName;
        }
    }

    @Override
    public void showLockTaskEscapeMessage(IBinder token) {
        synchronized (mGlobalLock) {
            final ActivityRecord r = ActivityRecord.forTokenLocked(token);
            if (r == null) {
                return;
            }
            getLockTaskController().showLockTaskToast();
        }
    }

    @Override
    public void keyguardGoingAway(int flags) {
        mAm.enforceNotIsolatedCaller("keyguardGoingAway");
        final long token = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                mKeyguardController.keyguardGoingAway(flags);
            }
        } finally {
            Binder.restoreCallingIdentity(token);
        }
    }

    /**
     * Try to place task to provided position. The final position might be different depending on
     * current user and stacks state. The task will be moved to target stack if it's currently in
     * different stack.
     */
    @Override
    public void positionTaskInStack(int taskId, int stackId, int position) {
        mAm.enforceCallingPermission(MANAGE_ACTIVITY_STACKS, "positionTaskInStack()");
        synchronized (mGlobalLock) {
            long ident = Binder.clearCallingIdentity();
            try {
                if (DEBUG_STACK) Slog.d(TAG_STACK, "positionTaskInStack: positioning task="
                        + taskId + " in stackId=" + stackId + " at position=" + position);
                final TaskRecord task = mStackSupervisor.anyTaskForIdLocked(taskId);
                if (task == null) {
                    throw new IllegalArgumentException("positionTaskInStack: no task for id="
                            + taskId);
                }

                final ActivityStack stack = mStackSupervisor.getStack(stackId);

                if (stack == null) {
                    throw new IllegalArgumentException("positionTaskInStack: no stack for id="
                            + stackId);
                }
                if (!stack.isActivityTypeStandardOrUndefined()) {
                    throw new IllegalArgumentException("positionTaskInStack: Attempt to change"
                            + " the position of task " + taskId + " in/to non-standard stack");
                }

                // TODO: Have the callers of this API call a separate reparent method if that is
                // what they intended to do vs. having this method also do reparenting.
                if (task.getStack() == stack) {
                    // Change position in current stack.
                    stack.positionChildAt(task, position);
                } else {
                    // Reparent to new stack.
                    task.reparent(stack, position, REPARENT_LEAVE_STACK_IN_PLACE, !ANIMATE,
                            !DEFER_RESUME, "positionTaskInStack");
                }
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    @Override
    public void reportSizeConfigurations(IBinder token, int[] horizontalSizeConfiguration,
            int[] verticalSizeConfigurations, int[] smallestSizeConfigurations) {
        if (DEBUG_CONFIGURATION) Slog.v(TAG, "Report configuration: " + token + " "
                + horizontalSizeConfiguration + " " + verticalSizeConfigurations);
        synchronized (mGlobalLock) {
            ActivityRecord record = ActivityRecord.isInStackLocked(token);
            if (record == null) {
                throw new IllegalArgumentException("reportSizeConfigurations: ActivityRecord not "
                        + "found for: " + token);
            }
            record.setSizeConfigurations(horizontalSizeConfiguration,
                    verticalSizeConfigurations, smallestSizeConfigurations);
        }
    }

    /**
     * Dismisses split-screen multi-window mode.
     * @param toTop If true the current primary split-screen stack will be placed or left on top.
     */
    @Override
    public void dismissSplitScreenMode(boolean toTop) {
        mAm.enforceCallerIsRecentsOrHasPermission(
                MANAGE_ACTIVITY_STACKS, "dismissSplitScreenMode()");
        final long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                final ActivityStack stack =
                        mStackSupervisor.getDefaultDisplay().getSplitScreenPrimaryStack();
                if (stack == null) {
                    Slog.w(TAG, "dismissSplitScreenMode: primary split-screen stack not found.");
                    return;
                }

                if (toTop) {
                    // Caller wants the current split-screen primary stack to be the top stack after
                    // it goes fullscreen, so move it to the front.
                    stack.moveToFront("dismissSplitScreenMode");
                } else if (mStackSupervisor.isFocusedStack(stack)) {
                    // In this case the current split-screen primary stack shouldn't be the top
                    // stack after it goes fullscreen, but it current has focus, so we move the
                    // focus to the top-most split-screen secondary stack next to it.
                    final ActivityStack otherStack = stack.getDisplay().getTopStackInWindowingMode(
                            WINDOWING_MODE_SPLIT_SCREEN_SECONDARY);
                    if (otherStack != null) {
                        otherStack.moveToFront("dismissSplitScreenMode_other");
                    }
                }

                stack.setWindowingMode(WINDOWING_MODE_FULLSCREEN);
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    /**
     * Dismisses Pip
     * @param animate True if the dismissal should be animated.
     * @param animationDuration The duration of the resize animation in milliseconds or -1 if the
     *                          default animation duration should be used.
     */
    @Override
    public void dismissPip(boolean animate, int animationDuration) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "dismissPip()");
        final long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                final PinnedActivityStack stack =
                        mStackSupervisor.getDefaultDisplay().getPinnedStack();
                if (stack == null) {
                    Slog.w(TAG, "dismissPip: pinned stack not found.");
                    return;
                }
                if (stack.getWindowingMode() != WINDOWING_MODE_PINNED) {
                    throw new IllegalArgumentException("Stack: " + stack
                            + " doesn't support animated resize.");
                }
                if (animate) {
                    stack.animateResizePinnedStack(null /* sourceHintBounds */,
                            null /* destBounds */, animationDuration, false /* fromFullscreen */);
                } else {
                    mStackSupervisor.moveTasksToFullscreenStackLocked(stack, true /* onTop */);
                }
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public void suppressResizeConfigChanges(boolean suppress) throws RemoteException {
        mAm.enforceCallingPermission(MANAGE_ACTIVITY_STACKS, "suppressResizeConfigChanges()");
        synchronized (mGlobalLock) {
            mSuppressResizeConfigChanges = suppress;
        }
    }

    /**
     * NOTE: For the pinned stack, this method is usually called after the bounds animation has
     *       animated the stack to the fullscreen, but can also be called if we are relaunching an
     *       activity and clearing the task at the same time.
     */
    @Override
    // TODO: API should just be about changing windowing modes...
    public void moveTasksToFullscreenStack(int fromStackId, boolean onTop) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS,
                "moveTasksToFullscreenStack()");
        synchronized (mGlobalLock) {
            final long origId = Binder.clearCallingIdentity();
            try {
                final ActivityStack stack = mStackSupervisor.getStack(fromStackId);
                if (stack != null){
                    if (!stack.isActivityTypeStandardOrUndefined()) {
                        throw new IllegalArgumentException(
                                "You can't move tasks from non-standard stacks.");
                    }
                    mStackSupervisor.moveTasksToFullscreenStackLocked(stack, onTop);
                }
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    /**
     * Moves the top activity in the input stackId to the pinned stack.
     *
     * @param stackId Id of stack to move the top activity to pinned stack.
     * @param bounds Bounds to use for pinned stack.
     *
     * @return True if the top activity of the input stack was successfully moved to the pinned
     *          stack.
     */
    @Override
    public boolean moveTopActivityToPinnedStack(int stackId, Rect bounds) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS,
                "moveTopActivityToPinnedStack()");
        synchronized (mGlobalLock) {
            if (!mAm.mSupportsPictureInPicture) {
                throw new IllegalStateException("moveTopActivityToPinnedStack:"
                        + "Device doesn't support picture-in-picture mode");
            }

            long ident = Binder.clearCallingIdentity();
            try {
                return mStackSupervisor.moveTopStackActivityToPinnedStackLocked(stackId, bounds);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    @Override
    public boolean isInMultiWindowMode(IBinder token) {
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                final ActivityRecord r = ActivityRecord.isInStackLocked(token);
                if (r == null) {
                    return false;
                }
                // An activity is consider to be in multi-window mode if its task isn't fullscreen.
                return r.inMultiWindowMode();
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    @Override
    public boolean isInPictureInPictureMode(IBinder token) {
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                return isInPictureInPictureMode(ActivityRecord.forTokenLocked(token));
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    private boolean isInPictureInPictureMode(ActivityRecord r) {
        if (r == null || r.getStack() == null || !r.inPinnedWindowingMode()
                || r.getStack().isInStackLocked(r) == null) {
            return false;
        }

        // If we are animating to fullscreen then we have already dispatched the PIP mode
        // changed, so we should reflect that check here as well.
        final PinnedActivityStack stack = r.getStack();
        final PinnedStackWindowController windowController = stack.getWindowContainerController();
        return !windowController.isAnimatingBoundsToFullscreen();
    }

    @Override
    public boolean enterPictureInPictureMode(IBinder token, final PictureInPictureParams params) {
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                final ActivityRecord r = ensureValidPictureInPictureActivityParamsLocked(
                        "enterPictureInPictureMode", token, params);

                // If the activity is already in picture in picture mode, then just return early
                if (isInPictureInPictureMode(r)) {
                    return true;
                }

                // Activity supports picture-in-picture, now check that we can enter PiP at this
                // point, if it is
                if (!r.checkEnterPictureInPictureState("enterPictureInPictureMode",
                        false /* beforeStopping */)) {
                    return false;
                }

                final Runnable enterPipRunnable = () -> {
                    synchronized (mGlobalLock) {
                        // Only update the saved args from the args that are set
                        r.pictureInPictureArgs.copyOnlySet(params);
                        final float aspectRatio = r.pictureInPictureArgs.getAspectRatio();
                        final List<RemoteAction> actions = r.pictureInPictureArgs.getActions();
                        // Adjust the source bounds by the insets for the transition down
                        final Rect sourceBounds = new Rect(
                                r.pictureInPictureArgs.getSourceRectHint());
                        mStackSupervisor.moveActivityToPinnedStackLocked(
                                r, sourceBounds, aspectRatio, "enterPictureInPictureMode");
                        final PinnedActivityStack stack = r.getStack();
                        stack.setPictureInPictureAspectRatio(aspectRatio);
                        stack.setPictureInPictureActions(actions);
                        MetricsLoggerWrapper.logPictureInPictureEnter(mContext, r.appInfo.uid,
                                r.shortComponentName, r.supportsEnterPipOnTaskSwitch);
                        logPictureInPictureArgs(params);
                    }
                };

                if (isKeyguardLocked()) {
                    // If the keyguard is showing or occluded, then try and dismiss it before
                    // entering picture-in-picture (this will prompt the user to authenticate if the
                    // device is currently locked).
                    dismissKeyguard(token, new KeyguardDismissCallback() {
                        @Override
                        public void onDismissSucceeded() throws RemoteException {
                            mAm.mHandler.post(enterPipRunnable);
                        }
                    }, null /* message */);
                } else {
                    // Enter picture in picture immediately otherwise
                    enterPipRunnable.run();
                }
                return true;
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    @Override
    public void setPictureInPictureParams(IBinder token, final PictureInPictureParams params) {
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                final ActivityRecord r = ensureValidPictureInPictureActivityParamsLocked(
                        "setPictureInPictureParams", token, params);

                // Only update the saved args from the args that are set
                r.pictureInPictureArgs.copyOnlySet(params);
                if (r.inPinnedWindowingMode()) {
                    // If the activity is already in picture-in-picture, update the pinned stack now
                    // if it is not already expanding to fullscreen. Otherwise, the arguments will
                    // be used the next time the activity enters PiP
                    final PinnedActivityStack stack = r.getStack();
                    if (!stack.isAnimatingBoundsToFullscreen()) {
                        stack.setPictureInPictureAspectRatio(
                                r.pictureInPictureArgs.getAspectRatio());
                        stack.setPictureInPictureActions(r.pictureInPictureArgs.getActions());
                    }
                }
                logPictureInPictureArgs(params);
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    @Override
    public int getMaxNumPictureInPictureActions(IBinder token) {
        // Currently, this is a static constant, but later, we may change this to be dependent on
        // the context of the activity
        return 3;
    }

    private void logPictureInPictureArgs(PictureInPictureParams params) {
        if (params.hasSetActions()) {
            MetricsLogger.histogram(mContext, "tron_varz_picture_in_picture_actions_count",
                    params.getActions().size());
        }
        if (params.hasSetAspectRatio()) {
            LogMaker lm = new LogMaker(MetricsEvent.ACTION_PICTURE_IN_PICTURE_ASPECT_RATIO_CHANGED);
            lm.addTaggedData(MetricsEvent.PICTURE_IN_PICTURE_ASPECT_RATIO, params.getAspectRatio());
            MetricsLogger.action(lm);
        }
    }

    /**
     * Checks the state of the system and the activity associated with the given {@param token} to
     * verify that picture-in-picture is supported for that activity.
     *
     * @return the activity record for the given {@param token} if all the checks pass.
     */
    private ActivityRecord ensureValidPictureInPictureActivityParamsLocked(String caller,
            IBinder token, PictureInPictureParams params) {
        if (!mAm.mSupportsPictureInPicture) {
            throw new IllegalStateException(caller
                    + ": Device doesn't support picture-in-picture mode.");
        }

        final ActivityRecord r = ActivityRecord.forTokenLocked(token);
        if (r == null) {
            throw new IllegalStateException(caller
                    + ": Can't find activity for token=" + token);
        }

        if (!r.supportsPictureInPicture()) {
            throw new IllegalStateException(caller
                    + ": Current activity does not support picture-in-picture.");
        }

        if (params.hasSetAspectRatio()
                && !mAm.mWindowManager.isValidPictureInPictureAspectRatio(r.getStack().mDisplayId,
                params.getAspectRatio())) {
            final float minAspectRatio = mContext.getResources().getFloat(
                    com.android.internal.R.dimen.config_pictureInPictureMinAspectRatio);
            final float maxAspectRatio = mContext.getResources().getFloat(
                    com.android.internal.R.dimen.config_pictureInPictureMaxAspectRatio);
            throw new IllegalArgumentException(String.format(caller
                            + ": Aspect ratio is too extreme (must be between %f and %f).",
                    minAspectRatio, maxAspectRatio));
        }

        // Truncate the number of actions if necessary
        params.truncateActions(getMaxNumPictureInPictureActions(token));

        return r;
    }

    @Override
    public IBinder getUriPermissionOwnerForActivity(IBinder activityToken) {
        mAm.enforceNotIsolatedCaller("getUriPermissionOwnerForActivity");
        synchronized (mGlobalLock) {
            ActivityRecord r = ActivityRecord.isInStackLocked(activityToken);
            if (r == null) {
                throw new IllegalArgumentException("Activity does not exist; token="
                        + activityToken);
            }
            return r.getUriPermissionsLocked().getExternalTokenLocked();
        }
    }

    @Override
    public void resizeDockedStack(Rect dockedBounds, Rect tempDockedTaskBounds,
            Rect tempDockedTaskInsetBounds,
            Rect tempOtherTaskBounds, Rect tempOtherTaskInsetBounds) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "resizeDockedStack()");
        long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                mStackSupervisor.resizeDockedStackLocked(dockedBounds, tempDockedTaskBounds,
                        tempDockedTaskInsetBounds, tempOtherTaskBounds, tempOtherTaskInsetBounds,
                        PRESERVE_WINDOWS);
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public void setSplitScreenResizing(boolean resizing) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "setSplitScreenResizing()");
        final long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                mStackSupervisor.setSplitScreenResizing(resizing);
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public int setVrMode(IBinder token, boolean enabled, ComponentName packageName) {
        mAm.enforceSystemHasVrFeature();

        final VrManagerInternal vrService = LocalServices.getService(VrManagerInternal.class);

        ActivityRecord r;
        synchronized (mGlobalLock) {
            r = ActivityRecord.isInStackLocked(token);
        }

        if (r == null) {
            throw new IllegalArgumentException();
        }

        int err;
        if ((err = vrService.hasVrPackage(packageName, r.userId)) !=
                VrManagerInternal.NO_ERROR) {
            return err;
        }

        // Clear the binder calling uid since this path may call moveToTask().
        final long callingId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                r.requestedVrComponent = (enabled) ? packageName : null;

                // Update associated state if this activity is currently focused
                if (r == mStackSupervisor.getResumedActivityLocked()) {
                    applyUpdateVrModeLocked(r);
                }
                return 0;
            }
        } finally {
            Binder.restoreCallingIdentity(callingId);
        }
    }

    @Override
    public void startLocalVoiceInteraction(IBinder callingActivity, Bundle options) {
        Slog.i(TAG, "Activity tried to startLocalVoiceInteraction");
        synchronized (mGlobalLock) {
            ActivityRecord activity = mAm.getFocusedStack().getTopActivity();
            if (ActivityRecord.forTokenLocked(callingActivity) != activity) {
                throw new SecurityException("Only focused activity can call startVoiceInteraction");
            }
            if (mAm.mRunningVoice != null || activity.getTask().voiceSession != null
                    || activity.voiceSession != null) {
                Slog.w(TAG, "Already in a voice interaction, cannot start new voice interaction");
                return;
            }
            if (activity.pendingVoiceInteractionStart) {
                Slog.w(TAG, "Pending start of voice interaction already.");
                return;
            }
            activity.pendingVoiceInteractionStart = true;
        }
        LocalServices.getService(VoiceInteractionManagerInternal.class)
                .startLocalVoiceInteraction(callingActivity, options);
    }

    @Override
    public void stopLocalVoiceInteraction(IBinder callingActivity) {
        LocalServices.getService(VoiceInteractionManagerInternal.class)
                .stopLocalVoiceInteraction(callingActivity);
    }

    @Override
    public boolean supportsLocalVoiceInteraction() {
        return LocalServices.getService(VoiceInteractionManagerInternal.class)
                .supportsLocalVoiceInteraction();
    }

    /** Notifies all listeners when the pinned stack animation starts. */
    @Override
    public void notifyPinnedStackAnimationStarted() {
        mTaskChangeNotificationController.notifyPinnedStackAnimationStarted();
    }

    /** Notifies all listeners when the pinned stack animation ends. */
    @Override
    public void notifyPinnedStackAnimationEnded() {
        mTaskChangeNotificationController.notifyPinnedStackAnimationEnded();
    }

    @Override
    public void resizePinnedStack(Rect pinnedBounds, Rect tempPinnedTaskBounds) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "resizePinnedStack()");
        final long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                mStackSupervisor.resizePinnedStackLocked(pinnedBounds, tempPinnedTaskBounds);
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public boolean updateDisplayOverrideConfiguration(Configuration values, int displayId) {
        mAm.enforceCallingPermission(CHANGE_CONFIGURATION, "updateDisplayOverrideConfiguration()");

        synchronized (mGlobalLock) {
            // Check if display is initialized in AM.
            if (!mStackSupervisor.isDisplayAdded(displayId)) {
                // Call might come when display is not yet added or has already been removed.
                if (DEBUG_CONFIGURATION) {
                    Slog.w(TAG, "Trying to update display configuration for non-existing displayId="
                            + displayId);
                }
                return false;
            }

            if (values == null && mAm.mWindowManager != null) {
                // sentinel: fetch the current configuration from the window manager
                values = mAm.mWindowManager.computeNewConfiguration(displayId);
            }

            if (mAm.mWindowManager != null) {
                // Update OOM levels based on display size.
                mAm.mProcessList.applyDisplaySize(mAm.mWindowManager);
            }

            final long origId = Binder.clearCallingIdentity();
            try {
                if (values != null) {
                    Settings.System.clearConfiguration(values);
                }
                mAm.updateDisplayOverrideConfigurationLocked(values, null /* starting */,
                        false /* deferResume */, displayId, mTmpUpdateConfigurationResult);
                return mTmpUpdateConfigurationResult.changes != 0;
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    @Override
    public boolean updateConfiguration(Configuration values) {
        mAm.enforceCallingPermission(CHANGE_CONFIGURATION, "updateConfiguration()");

        synchronized (mGlobalLock) {
            if (values == null && mAm.mWindowManager != null) {
                // sentinel: fetch the current configuration from the window manager
                values = mAm.mWindowManager.computeNewConfiguration(DEFAULT_DISPLAY);
            }

            if (mAm.mWindowManager != null) {
                // Update OOM levels based on display size.
                mAm.mProcessList.applyDisplaySize(mAm.mWindowManager);
            }

            final long origId = Binder.clearCallingIdentity();
            try {
                if (values != null) {
                    Settings.System.clearConfiguration(values);
                }
                mAm.updateConfigurationLocked(values, null, false, false /* persistent */,
                        UserHandle.USER_NULL, false /* deferResume */,
                        mTmpUpdateConfigurationResult);
                return mTmpUpdateConfigurationResult.changes != 0;
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    @Override
    public void dismissKeyguard(IBinder token, IKeyguardDismissCallback callback,
            CharSequence message) {
        if (message != null) {
            mAm.enforceCallingPermission(
                    Manifest.permission.SHOW_KEYGUARD_MESSAGE, "dismissKeyguard()");
        }
        final long callingId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                mKeyguardController.dismissKeyguard(token, callback, message);
            }
        } finally {
            Binder.restoreCallingIdentity(callingId);
        }
    }

    @Override
    public void cancelTaskWindowTransition(int taskId) {
        mAm.enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS,
                "cancelTaskWindowTransition()");
        final long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                final TaskRecord task = mStackSupervisor.anyTaskForIdLocked(taskId,
                        MATCH_TASK_IN_STACKS_ONLY);
                if (task == null) {
                    Slog.w(TAG, "cancelTaskWindowTransition: taskId=" + taskId + " not found");
                    return;
                }
                task.cancelWindowTransition();
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public ActivityManager.TaskSnapshot getTaskSnapshot(int taskId, boolean reducedResolution) {
        mAm.enforceCallerIsRecentsOrHasPermission(READ_FRAME_BUFFER, "getTaskSnapshot()");
        final long ident = Binder.clearCallingIdentity();
        try {
            final TaskRecord task;
            synchronized (mGlobalLock) {
                task = mStackSupervisor.anyTaskForIdLocked(taskId,
                        MATCH_TASK_IN_STACKS_OR_RECENT_TASKS);
                if (task == null) {
                    Slog.w(TAG, "getTaskSnapshot: taskId=" + taskId + " not found");
                    return null;
                }
            }
            // Don't call this while holding the lock as this operation might hit the disk.
            return task.getSnapshot(reducedResolution);
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public void setDisablePreviewScreenshots(IBinder token, boolean disable) {
        synchronized (mGlobalLock) {
            final ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                Slog.w(TAG, "setDisablePreviewScreenshots: Unable to find activity for token="
                        + token);
                return;
            }
            final long origId = Binder.clearCallingIdentity();
            try {
                r.setDisablePreviewScreenshots(disable);
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    /** Return the user id of the last resumed activity. */
    @Override
    public @UserIdInt
    int getLastResumedActivityUserId() {
        mAm.enforceCallingPermission(
                Manifest.permission.INTERACT_ACROSS_USERS_FULL, "getLastResumedActivityUserId()");
        synchronized (mGlobalLock) {
            if (mAm.mLastResumedActivity == null) {
                return mAm.mUserController.getCurrentUserId();
            }
            return mAm.mLastResumedActivity.userId;
        }
    }

    @Override
    public void updateLockTaskFeatures(int userId, int flags) {
        final int callingUid = Binder.getCallingUid();
        if (callingUid != 0 && callingUid != SYSTEM_UID) {
            mAm.enforceCallingPermission(android.Manifest.permission.UPDATE_LOCK_TASK_PACKAGES,
                    "updateLockTaskFeatures()");
        }
        synchronized (mGlobalLock) {
            if (DEBUG_LOCKTASK) Slog.w(TAG_LOCKTASK, "Allowing features " + userId + ":0x" +
                    Integer.toHexString(flags));
            getLockTaskController().updateLockTaskFeatures(userId, flags);
        }
    }

    @Override
    public void setShowWhenLocked(IBinder token, boolean showWhenLocked) {
        synchronized (mGlobalLock) {
            final ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                return;
            }
            final long origId = Binder.clearCallingIdentity();
            try {
                r.setShowWhenLocked(showWhenLocked);
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    @Override
    public void setTurnScreenOn(IBinder token, boolean turnScreenOn) {
        synchronized (mGlobalLock) {
            final ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                return;
            }
            final long origId = Binder.clearCallingIdentity();
            try {
                r.setTurnScreenOn(turnScreenOn);
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    @Override
    public void registerRemoteAnimations(IBinder token, RemoteAnimationDefinition definition) {
        mAm.enforceCallingPermission(CONTROL_REMOTE_APP_TRANSITION_ANIMATIONS,
                "registerRemoteAnimations");
        definition.setCallingPid(Binder.getCallingPid());
        synchronized (mGlobalLock) {
            final ActivityRecord r = ActivityRecord.isInStackLocked(token);
            if (r == null) {
                return;
            }
            final long origId = Binder.clearCallingIdentity();
            try {
                r.registerRemoteAnimations(definition);
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    @Override
    public void registerRemoteAnimationForNextActivityStart(String packageName,
            RemoteAnimationAdapter adapter) {
        mAm.enforceCallingPermission(CONTROL_REMOTE_APP_TRANSITION_ANIMATIONS,
                "registerRemoteAnimationForNextActivityStart");
        adapter.setCallingPid(Binder.getCallingPid());
        synchronized (mGlobalLock) {
            final long origId = Binder.clearCallingIdentity();
            try {
                mAm.getActivityStartController().registerRemoteAnimationForNextActivityStart(
                        packageName, adapter);
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    /** @see android.app.ActivityManager#alwaysShowUnsupportedCompileSdkWarning */
    @Override
    public void alwaysShowUnsupportedCompileSdkWarning(ComponentName activity) {
        synchronized (mGlobalLock) {
            final long origId = Binder.clearCallingIdentity();
            try {
                mAm.mAppWarnings.alwaysShowUnsupportedCompileSdkWarning(activity);
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    @Override
    public void setVrThread(int tid) {
        mAm.enforceSystemHasVrFeature();
        synchronized (mGlobalLock) {
            synchronized (mAm.mPidsSelfLocked) {
                final int pid = Binder.getCallingPid();
                final ProcessRecord proc = mAm.mPidsSelfLocked.get(pid);
                mVrController.setVrThreadLocked(tid, pid, proc);
            }
        }
    }

    @Override
    public void setPersistentVrThread(int tid) {
        if (mAm.checkCallingPermission(Manifest.permission.RESTRICTED_VR_ACCESS)
                != PERMISSION_GRANTED) {
            final String msg = "Permission Denial: setPersistentVrThread() from pid="
                    + Binder.getCallingPid()
                    + ", uid=" + Binder.getCallingUid()
                    + " requires " + Manifest.permission.RESTRICTED_VR_ACCESS;
            Slog.w(TAG, msg);
            throw new SecurityException(msg);
        }
        mAm.enforceSystemHasVrFeature();
        synchronized (mGlobalLock) {
            synchronized (mAm.mPidsSelfLocked) {
                final int pid = Binder.getCallingPid();
                final ProcessRecord proc = mAm.mPidsSelfLocked.get(pid);
                mVrController.setPersistentVrThreadLocked(tid, pid, proc);
            }
        }
    }

    /**
     * @return whether the system should disable UI modes incompatible with VR mode.
     */
    boolean shouldDisableNonVrUiLocked() {
        return mVrController.shouldDisableNonVrUiLocked();
    }

    void applyUpdateVrModeLocked(ActivityRecord r) {
        // VR apps are expected to run in a main display. If an app is turning on VR for
        // itself, but lives in a dynamic stack, then make sure that it is moved to the main
        // fullscreen stack before enabling VR Mode.
        // TODO: The goal of this code is to keep the VR app on the main display. When the
        // stack implementation changes in the future, keep in mind that the use of the fullscreen
        // stack is a means to move the activity to the main display and a moveActivityToDisplay()
        // option would be a better choice here.
        if (r.requestedVrComponent != null && r.getDisplayId() != DEFAULT_DISPLAY) {
            Slog.i(TAG, "Moving " + r.shortComponentName + " from stack " + r.getStackId()
                    + " to main stack for VR");
            final ActivityStack stack = mStackSupervisor.getDefaultDisplay().getOrCreateStack(
                    WINDOWING_MODE_FULLSCREEN, r.getActivityType(), true /* toTop */);
            moveTaskToStack(r.getTask().taskId, stack.mStackId, true /* toTop */);
        }
        mH.post(() -> {
            if (!mVrController.onVrModeChanged(r)) {
                return;
            }
            synchronized (mGlobalLock) {
                final boolean disableNonVrUi = mVrController.shouldDisableNonVrUiLocked();
                mWindowManager.disableNonVrUi(disableNonVrUi);
                if (disableNonVrUi) {
                    // If we are in a VR mode where Picture-in-Picture mode is unsupported,
                    // then remove the pinned stack.
                    mStackSupervisor.removeStacksInWindowingModes(WINDOWING_MODE_PINNED);
                }
            }
        });
    }

    /** Pokes the task persister. */
    void notifyTaskPersisterLocked(TaskRecord task, boolean flush) {
        mRecentTasks.notifyTaskPersisterLocked(task, flush);
    }

    void onTopProcChangedLocked(ProcessRecord proc) {
        mVrController.onTopProcChangedLocked(proc);
    }

    boolean isKeyguardLocked() {
        return mKeyguardController.isKeyguardLocked();
    }

    boolean isNextTransitionForward() {
        int transit = mWindowManager.getPendingAppTransition();
        return transit == TRANSIT_ACTIVITY_OPEN
                || transit == TRANSIT_TASK_OPEN
                || transit == TRANSIT_TASK_TO_FRONT;
    }

    void dumpVrControllerLocked(PrintWriter pw) {
        pw.println("  mVrController=" + mVrController);
    }

    void writeVrControllerToProto(ProtoOutputStream proto, long fieldId) {
        mVrController.writeToProto(proto, fieldId);
    }

    final class H extends Handler {
        public H(Looper looper) {
            super(looper, null, true);
        }
    }

    final class LocalService extends ActivityTaskManagerInternal {
        @Override
        public SleepToken acquireSleepToken(String tag, int displayId) {
            Preconditions.checkNotNull(tag);
            return mAm.acquireSleepToken(tag, displayId);
        }

        @Override
        public ComponentName getHomeActivityForUser(int userId) {
            synchronized (mGlobalLock) {
                ActivityRecord homeActivity = mStackSupervisor.getHomeActivityForUser(userId);
                return homeActivity == null ? null : homeActivity.realActivity;
            }
        }

        @Override
        public void onLocalVoiceInteractionStarted(IBinder activity,
                IVoiceInteractionSession voiceSession, IVoiceInteractor voiceInteractor) {
            synchronized (mGlobalLock) {
                mAm.onLocalVoiceInteractionStartedLocked(activity, voiceSession, voiceInteractor);
            }
        }

        @Override
        public void notifyAppTransitionStarting(SparseIntArray reasons, long timestamp) {
            synchronized (mGlobalLock) {
                mStackSupervisor.getActivityMetricsLogger().notifyTransitionStarting(
                        reasons, timestamp);
            }
        }

        @Override
        public void notifyAppTransitionFinished() {
            synchronized (mGlobalLock) {
                mStackSupervisor.notifyAppTransitionDone();
            }
        }

        @Override
        public void notifyAppTransitionCancelled() {
            synchronized (mGlobalLock) {
                mStackSupervisor.notifyAppTransitionDone();
            }
        }

        @Override
        public List<IBinder> getTopVisibleActivities() {
            synchronized (mGlobalLock) {
                return mStackSupervisor.getTopVisibleActivities();
            }
        }

        @Override
        public void notifyDockedStackMinimizedChanged(boolean minimized) {
            synchronized (mGlobalLock) {
                mStackSupervisor.setDockedStackMinimized(minimized);
            }
        }

        @Override
        public int startActivitiesAsPackage(String packageName, int userId, Intent[] intents,
                Bundle bOptions) {
            Preconditions.checkNotNull(intents, "intents");
            final String[] resolvedTypes = new String[intents.length];

            // UID of the package on user userId.
            // "= 0" is needed because otherwise catch(RemoteException) would make it look like
            // packageUid may not be initialized.
            int packageUid = 0;
            final long ident = Binder.clearCallingIdentity();

            try {
                for (int i = 0; i < intents.length; i++) {
                    resolvedTypes[i] =
                            intents[i].resolveTypeIfNeeded(mContext.getContentResolver());
                }

                packageUid = AppGlobals.getPackageManager().getPackageUid(
                        packageName, PackageManager.MATCH_DEBUG_TRIAGED_MISSING, userId);
            } catch (RemoteException e) {
                // Shouldn't happen.
            } finally {
                Binder.restoreCallingIdentity(ident);
            }

            synchronized (mGlobalLock) {
                return mAm.getActivityStartController().startActivitiesInPackage(
                        packageUid, packageName,
                        intents, resolvedTypes, null /* resultTo */,
                        SafeActivityOptions.fromBundle(bOptions), userId,
                        false /* validateIncomingUser */);
            }
        }

        @Override
        public int startActivityAsUser(IApplicationThread caller, String callerPacakge,
                Intent intent, Bundle options, int userId) {
            return ActivityTaskManagerService.this.startActivityAsUser(
                    caller, callerPacakge, intent,
                    intent.resolveTypeIfNeeded(mContext.getContentResolver()),
                    null, null, 0, Intent.FLAG_ACTIVITY_NEW_TASK, null, options, userId,
                    false /*validateIncomingUser*/);
        }

        @Override
        public void notifyKeyguardFlagsChanged(@Nullable Runnable callback) {
            synchronized (mGlobalLock) {

                // We might change the visibilities here, so prepare an empty app transition which
                // might be overridden later if we actually change visibilities.
                final boolean wasTransitionSet =
                        mAm.mWindowManager.getPendingAppTransition() != TRANSIT_NONE;
                if (!wasTransitionSet) {
                    mAm.mWindowManager.prepareAppTransition(TRANSIT_NONE,
                            false /* alwaysKeepCurrent */);
                }
                mStackSupervisor.ensureActivitiesVisibleLocked(null, 0, !PRESERVE_WINDOWS);

                // If there was a transition set already we don't want to interfere with it as we
                // might be starting it too early.
                if (!wasTransitionSet) {
                    mAm.mWindowManager.executeAppTransition();
                }
            }
            if (callback != null) {
                callback.run();
            }
        }

        @Override
        public void notifyKeyguardTrustedChanged() {
            synchronized (mGlobalLock) {
                if (mKeyguardController.isKeyguardShowing(DEFAULT_DISPLAY)) {
                    mStackSupervisor.ensureActivitiesVisibleLocked(null, 0, !PRESERVE_WINDOWS);
                }
            }
        }

        /**
         * Called after virtual display Id is updated by
         * {@link com.android.server.vr.Vr2dDisplay} with a specific
         * {@param vrVr2dDisplayId}.
         */
        @Override
        public void setVr2dDisplayId(int vr2dDisplayId) {
            if (DEBUG_STACK) Slog.d(TAG, "setVr2dDisplayId called for: " + vr2dDisplayId);
            synchronized (mGlobalLock) {
                mAm.mVr2dDisplayId = vr2dDisplayId;
            }
        }

        @Override
        public void setFocusedActivity(IBinder token) {
            synchronized (mGlobalLock) {
                final ActivityRecord r = ActivityRecord.forTokenLocked(token);
                if (r == null) {
                    throw new IllegalArgumentException(
                            "setFocusedActivity: No activity record matching token=" + token);
                }
                if (mStackSupervisor.moveFocusableActivityStackToFrontLocked(
                        r, "setFocusedActivity")) {
                    mStackSupervisor.resumeFocusedStackTopActivityLocked();
                }
            }
        }

        @Override
        public boolean hasRunningActivity(int uid, @Nullable String packageName) {
            if (packageName == null) return false;

            synchronized (mGlobalLock) {
                for (int i = 0; i < mAm.mLruProcesses.size(); i++) {
                    final ProcessRecord processRecord = mAm.mLruProcesses.get(i);
                    if (processRecord.uid == uid) {
                        for (int j = 0; j < processRecord.activities.size(); j++) {
                            final ActivityRecord activityRecord = processRecord.activities.get(j);
                            if (packageName.equals(activityRecord.packageName)) {
                                return true;
                            }
                        }
                    }
                }
            }
            return false;
        }

        @Override
        public void registerScreenObserver(ScreenObserver observer) {
            mAm.mScreenObservers.add(observer);
        }

        @Override
        public boolean isCallerRecents(int callingUid) {
            return getRecentTasks().isCallerRecents(callingUid);
        }

        @Override
        public boolean isRecentsComponentHomeActivity(int userId) {
            return getRecentTasks().isRecentsComponentHomeActivity(userId);
        }

        @Override
        public void cancelRecentsAnimation(boolean restoreHomeStackPosition) {
            ActivityTaskManagerService.this.cancelRecentsAnimation(restoreHomeStackPosition);
        }

        @Override
        public void enforceCallerIsRecentsOrHasPermission(String permission, String func) {
            mAm.enforceCallerIsRecentsOrHasPermission(permission, func);
        }

        @Override
        public void notifyActiveVoiceInteractionServiceChanged(ComponentName component) {
            synchronized (mGlobalLock) {
                mActiveVoiceInteractionServiceComponent = component;
            }
        }
    }
}