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.Manifest.permission.STOP_APP_SWITCHES;
import static android.app.ActivityManager.LOCK_TASK_MODE_NONE;
import static android.os.Trace.TRACE_TAG_ACTIVITY_MANAGER;
import static android.provider.Settings.Global.HIDE_ERROR_DIALOGS;
import static android.provider.Settings.System.FONT_SCALE;
import static com.android.server.am.ActivityManagerService.dumpStackTraces;
import static com.android.server.am.ActivityTaskManagerService.H.REPORT_TIME_TRACKER_MSG;
import static com.android.server.am.ActivityTaskManagerService.UiHandler.DISMISS_DIALOG_UI_MSG;
import static com.android.server.wm.ActivityTaskManagerInternal.ASSIST_KEY_CONTENT;
import static com.android.server.wm.ActivityTaskManagerInternal.ASSIST_KEY_DATA;
import static com.android.server.wm.ActivityTaskManagerInternal.ASSIST_KEY_RECEIVER_EXTRAS;
import static com.android.server.wm.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.AppOpsManager.OP_NONE;
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.FEATURE_ACTIVITIES_ON_SECONDARY_DISPLAYS;
import static android.content.pm.PackageManager.FEATURE_FREEFORM_WINDOW_MANAGEMENT;
import static android.content.pm.PackageManager.FEATURE_PICTURE_IN_PICTURE;
import static android.content.pm.PackageManager.PERMISSION_GRANTED;
import static android.content.res.Configuration.UI_MODE_TYPE_TELEVISION;
import static android.os.Build.VERSION_CODES.N;
import static android.os.Process.SYSTEM_UID;
import static android.provider.Settings.Global.ALWAYS_FINISH_ACTIVITIES;
import static android.provider.Settings.Global.DEVELOPMENT_ENABLE_FREEFORM_WINDOWS_SUPPORT;
import static android.provider.Settings.Global.DEVELOPMENT_FORCE_RESIZABLE_ACTIVITIES;
import static android.provider.Settings.Global.DEVELOPMENT_FORCE_RTL;
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_TASKS;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_VISIBILITY;
import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_CONFIGURATION;
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 android.app.ActivityManagerInternal.ALLOW_FULL_ONLY;
import static com.android.server.am.ActivityManagerService.ANIMATE;
import static com.android.server.am.ActivityManagerService.MY_PID;
import static com.android.server.am.ActivityManagerService.SEND_LOCALE_TO_MOUNT_DAEMON_MSG;
import static com.android.server.am.ActivityManagerService.STOCK_PM_FLAGS;
import static com.android.server.am.ActivityManagerService.UPDATE_CONFIGURATION_MSG;
import static com.android.server.am.ActivityManagerService.checkComponentPermission;
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.NonNull;
import android.annotation.Nullable;
import android.annotation.UserIdInt;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityManagerInternal;
import android.app.ActivityOptions;
import android.app.ActivityTaskManager;
import android.app.ActivityThread;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.database.ContentObserver;
import android.os.IUserManager;
import android.os.PowerManager;
import android.os.ServiceManager;
import android.os.Trace;
import android.os.UserManager;
import android.os.WorkSource;
import android.view.WindowManager;
import com.android.internal.R;
import com.android.internal.annotations.GuardedBy;
import com.android.internal.app.IAppOpsService;
import com.android.server.AppOpsService;
import com.android.server.pm.UserManagerService;
import com.android.server.uri.UriGrantsManagerInternal;
import com.android.server.wm.ActivityTaskManagerInternal;
import android.app.AppGlobals;
import android.app.IActivityController;
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.servertransaction.ConfigurationChangeItem;
import android.app.usage.UsageEvents;
import android.content.ActivityNotFoundException;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.Context;
import android.content.IIntentSender;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.ParceledListSlice;
import android.content.pm.ResolveInfo;
import android.content.res.Configuration;
import android.content.res.Resources;
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.Build;
import android.os.Bundle;
import android.os.FileUtils;
import android.os.Handler;
import android.os.IBinder;
import android.os.LocaleList;
import android.os.Looper;
import android.os.Message;
import android.os.PersistableBundle;
import android.os.Process;
import android.os.RemoteException;
import android.os.StrictMode;
import android.os.SystemClock;
import android.os.SystemProperties;
import android.os.UpdateLock;
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.text.format.Time;
import android.util.ArrayMap;
import android.util.EventLog;
import android.util.Log;
import android.util.Slog;

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

import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.app.AssistUtils;
import com.android.internal.app.IVoiceInteractor;
import com.android.internal.app.ProcessMap;
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.AttributeCache;
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.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

/**
 * 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;
    private static final String TAG_CONFIGURATION = TAG + POSTFIX_CONFIGURATION;

    Context mContext;
    /**
     * This Context is themable and meant for UI display (AlertDialogs, etc.). The theme can
     * change at runtime. Use mContext for non-UI purposes.
     */
    final Context mUiContext;
    H mH;
    UiHandler mUiHandler;
    ActivityManagerService mAm;
    ActivityManagerInternal mAmInternal;
    UriGrantsManagerInternal mUgmInternal;
    /* Global service lock used by the package the owns this service. */
    Object mGlobalLock;
    ActivityStackSupervisor mStackSupervisor;
    WindowManagerService mWindowManager;
    private UserManagerService mUserManager;
    private AppOpsService mAppOpsService;
    /** All processes currently running that might have a window organized by name. */
    final ProcessMap<WindowProcessController> mProcessNames = new ProcessMap<>();
    /** This is the process holding what we currently consider to be the "home" activity. */
    WindowProcessController mHomeProcess;
    /**
     * This is the process holding the activity the user last visited that is in a different process
     * from the one they are currently in.
     */
    WindowProcessController mPreviousProcess;
    /** The time at which the previous process was last visible. */
    long mPreviousProcessVisibleTime;

    /** 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;
    private ActivityStartController mActivityStartController;

    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;
        }
    }

    /** Current sequencing integer of the configuration, for skipping old configurations. */
    private int mConfigurationSeq;
    // To cache the list of supported system locales
    private String[] mSupportedSystemLocales = null;

    /**
     * Temp object used when global and/or display override configuration is updated. It is also
     * sent to outer world instead of {@link #getGlobalConfiguration} because we don't trust
     * anyone...
     */
    private Configuration mTempConfig = new Configuration();

    /** Temporary to avoid allocations. */
    final StringBuilder mStringBuilder = new StringBuilder(256);

    // Amount of time after a call to stopAppSwitches() during which we will
    // prevent further untrusted switches from happening.
    private static final long APP_SWITCH_DELAY_TIME = 5 * 1000;

    /**
     * The time at which we will allow normal application switches again,
     * after a call to {@link #stopAppSwitches()}.
     */
    private long mAppSwitchesAllowedTime;
    /**
     * This is set to true after the first switch after mAppSwitchesAllowedTime
     * is set; any switches after that will clear the time.
     */
    private boolean mDidAppSwitch;

    IActivityController mController = null;
    boolean mControllerIsAMonkey = false;

    /**
     * Used to retain an update lock when the foreground activity is in
     * immersive mode.
     */
    private final UpdateLock mUpdateLock = new UpdateLock("immersive");

    /**
     * Packages that are being allowed to perform unrestricted app switches.  Mapping is
     * User -> Type -> uid.
     */
    final SparseArray<ArrayMap<String, Integer>> mAllowAppSwitchUids = new SparseArray<>();

    /** The dimensions of the thumbnails in the Recents UI. */
    private int mThumbnailWidth;
    private int mThumbnailHeight;
    private float mFullscreenThumbnailScale;

    /**
     * Flag that indicates if multi-window is enabled.
     *
     * For any particular form of multi-window to be enabled, generic multi-window must be enabled
     * in {@link com.android.internal.R.bool#config_supportsMultiWindow} config or
     * {@link Settings.Global#DEVELOPMENT_FORCE_RESIZABLE_ACTIVITIES} development option set.
     * At least one of the forms of multi-window must be enabled in order for this flag to be
     * initialized to 'true'.
     *
     * @see #mSupportsSplitScreenMultiWindow
     * @see #mSupportsFreeformWindowManagement
     * @see #mSupportsPictureInPicture
     * @see #mSupportsMultiDisplay
     */
    boolean mSupportsMultiWindow;
    boolean mSupportsSplitScreenMultiWindow;
    boolean mSupportsFreeformWindowManagement;
    boolean mSupportsPictureInPicture;
    boolean mSupportsMultiDisplay;
    boolean mForceResizableActivities;

    final List<ActivityTaskManagerInternal.ScreenObserver> mScreenObservers = new ArrayList<>();

    // VR Vr2d Display Id.
    int mVr2dDisplayId = INVALID_DISPLAY;

    /**
     * Set while we are wanting to sleep, to prevent any
     * activities from being started/resumed.
     *
     * TODO(b/33594039): Clarify the actual state transitions represented by mSleeping.
     *
     * Currently mSleeping is set to true when transitioning into the sleep state, and remains true
     * while in the sleep state until there is a pending transition out of sleep, in which case
     * mSleeping is set to false, and remains false while awake.
     *
     * Whether mSleeping can quickly toggled between true/false without the device actually
     * display changing states is undefined.
     */
    private boolean mSleeping = false;

    /**
     * The process state used for processes that are running the top activities.
     * This changes between TOP and TOP_SLEEPING to following mSleeping.
     */
    int mTopProcessState = ActivityManager.PROCESS_STATE_TOP;

    // Whether we should show our dialogs (ANR, crash, etc) or just perform their default action
    // automatically. Important for devices without direct input devices.
    private boolean mShowDialogs = true;

    /** Set if we are shutting down the system, similar to sleeping. */
    boolean mShuttingDown = false;

    /**
     * We want to hold a wake lock while running a voice interaction session, since
     * this may happen with the screen off and we need to keep the CPU running to
     * be able to continue to interact with the user.
     */
    PowerManager.WakeLock mVoiceWakeLock;

    /**
     * Set while we are running a voice interaction. This overrides sleeping while it is active.
     */
    IVoiceInteractionSession mRunningVoice;

    /**
     * The last resumed activity. This is identical to the current resumed activity most
     * of the time but could be different when we're pausing one activity before we resume
     * another activity.
     */
    ActivityRecord mLastResumedActivity;

    /**
     * The activity that is currently being traced as the active resumed activity.
     *
     * @see #updateResumedAppTrace
     */
    private @Nullable ActivityRecord mTracedResumedActivity;

    /** If non-null, we are tracking the time the user spends in the currently focused app. */
    AppTimeTracker mCurAppTimeTracker;

    private FontScaleSettingObserver mFontScaleSettingObserver;

    private final class FontScaleSettingObserver extends ContentObserver {
        private final Uri mFontScaleUri = Settings.System.getUriFor(FONT_SCALE);
        private final Uri mHideErrorDialogsUri = Settings.Global.getUriFor(HIDE_ERROR_DIALOGS);

        public FontScaleSettingObserver() {
            super(mH);
            final ContentResolver resolver = mContext.getContentResolver();
            resolver.registerContentObserver(mFontScaleUri, false, this, UserHandle.USER_ALL);
            resolver.registerContentObserver(mHideErrorDialogsUri, false, this,
                    UserHandle.USER_ALL);
        }

        @Override
        public void onChange(boolean selfChange, Uri uri, @UserIdInt int userId) {
            if (mFontScaleUri.equals(uri)) {
                updateFontScaleIfNeeded(userId);
            } else if (mHideErrorDialogsUri.equals(uri)) {
                synchronized (mGlobalLock) {
                    updateShouldShowDialogsLocked(getGlobalConfiguration());
                }
            }
        }
    }

    ActivityTaskManagerService(Context context) {
        mContext = context;
        mUiContext = ActivityThread.currentActivityThread().getSystemUiContext();
        mLifecycleManager = new ClientLifecycleManager();
    }

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

    void onInitPowerManagement() {
        mStackSupervisor.initPowerManagement();
        final PowerManager pm = (PowerManager)mContext.getSystemService(Context.POWER_SERVICE);
        mVoiceWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "*voice*");
        mVoiceWakeLock.setReferenceCounted(false);
    }

    void installSystemProviders() {
        mFontScaleSettingObserver = new FontScaleSettingObserver();
    }

    void retrieveSettings(ContentResolver resolver) {
        final boolean freeformWindowManagement =
                mContext.getPackageManager().hasSystemFeature(FEATURE_FREEFORM_WINDOW_MANAGEMENT)
                        || Settings.Global.getInt(
                        resolver, DEVELOPMENT_ENABLE_FREEFORM_WINDOWS_SUPPORT, 0) != 0;

        final boolean supportsMultiWindow = ActivityTaskManager.supportsMultiWindow(mContext);
        final boolean supportsPictureInPicture = supportsMultiWindow &&
                mContext.getPackageManager().hasSystemFeature(FEATURE_PICTURE_IN_PICTURE);
        final boolean supportsSplitScreenMultiWindow =
                ActivityTaskManager.supportsSplitScreenMultiWindow(mContext);
        final boolean supportsMultiDisplay = mContext.getPackageManager()
                .hasSystemFeature(FEATURE_ACTIVITIES_ON_SECONDARY_DISPLAYS);
        final boolean alwaysFinishActivities =
                Settings.Global.getInt(resolver, ALWAYS_FINISH_ACTIVITIES, 0) != 0;
        final boolean forceRtl = Settings.Global.getInt(resolver, DEVELOPMENT_FORCE_RTL, 0) != 0;
        final boolean forceResizable = Settings.Global.getInt(
                resolver, DEVELOPMENT_FORCE_RESIZABLE_ACTIVITIES, 0) != 0;

        // Transfer any global setting for forcing RTL layout, into a System Property
        SystemProperties.set(DEVELOPMENT_FORCE_RTL, forceRtl ? "1":"0");

        final Configuration configuration = new Configuration();
        Settings.System.getConfiguration(resolver, configuration);
        if (forceRtl) {
            // This will take care of setting the correct layout direction flags
            configuration.setLayoutDirection(configuration.locale);
        }

        synchronized (mGlobalLock) {
            mForceResizableActivities = forceResizable;
            final boolean multiWindowFormEnabled = freeformWindowManagement
                    || supportsSplitScreenMultiWindow
                    || supportsPictureInPicture
                    || supportsMultiDisplay;
            if ((supportsMultiWindow || forceResizable) && multiWindowFormEnabled) {
                mSupportsMultiWindow = true;
                mSupportsFreeformWindowManagement = freeformWindowManagement;
                mSupportsSplitScreenMultiWindow = supportsSplitScreenMultiWindow;
                mSupportsPictureInPicture = supportsPictureInPicture;
                mSupportsMultiDisplay = supportsMultiDisplay;
            } else {
                mSupportsMultiWindow = false;
                mSupportsFreeformWindowManagement = false;
                mSupportsSplitScreenMultiWindow = false;
                mSupportsPictureInPicture = false;
                mSupportsMultiDisplay = false;
            }
            mWindowManager.setForceResizableTasks(mForceResizableActivities);
            mWindowManager.setSupportsPictureInPicture(mSupportsPictureInPicture);
            // This happens before any activities are started, so we can change global configuration
            // in-place.
            updateConfigurationLocked(configuration, null, true);
            final Configuration globalConfig = getGlobalConfiguration();
            if (DEBUG_CONFIGURATION) Slog.v(TAG_CONFIGURATION, "Initial config: " + globalConfig);

            // Load resources only after the current configuration has been set.
            final Resources res = mContext.getResources();
            mThumbnailWidth = res.getDimensionPixelSize(
                    com.android.internal.R.dimen.thumbnail_width);
            mThumbnailHeight = res.getDimensionPixelSize(
                    com.android.internal.R.dimen.thumbnail_height);

            if ((globalConfig.uiMode & UI_MODE_TYPE_TELEVISION) == UI_MODE_TYPE_TELEVISION) {
                mFullscreenThumbnailScale = (float) res
                        .getInteger(com.android.internal.R.integer.thumbnail_width_tv) /
                        (float) globalConfig.screenWidthDp;
            } else {
                mFullscreenThumbnailScale = res.getFraction(
                        com.android.internal.R.fraction.thumbnail_fullscreen_scale, 1, 1);
            }
        }
    }

    // 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());
        mUiHandler = new UiHandler();

        mTempConfig.setToDefaults();
        mTempConfig.setLocales(LocaleList.getDefault());
        mConfigurationSeq = mTempConfig.seq = 1;
        mStackSupervisor = createStackSupervisor();
        mStackSupervisor.onConfigurationChanged(mTempConfig);

        mTaskChangeNotificationController =
                new TaskChangeNotificationController(mGlobalLock, mStackSupervisor, mH);
        mLockTaskController = new LockTaskController(mContext, mStackSupervisor, mH);
        mActivityStartController = new ActivityStartController(this);
        mRecentTasks = createRecentTasks();
        mStackSupervisor.setRecentTasks(mRecentTasks);
        mVrController = new VrController(mGlobalLock);
        mKeyguardController = mStackSupervisor.getKeyguardController();
    }

    void onActivityManagerInternalAdded() {
        mAmInternal = LocalServices.getService(ActivityManagerInternal.class);
        mUgmInternal = LocalServices.getService(UriGrantsManagerInternal.class);
    }

    protected ActivityStackSupervisor createStackSupervisor() {
        final ActivityStackSupervisor supervisor = new ActivityStackSupervisor(this, mH.getLooper());
        supervisor.initialize();
        return supervisor;
    }

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

    UserManagerService getUserManager() {
        if (mUserManager == null) {
            IBinder b = ServiceManager.getService(Context.USER_SERVICE);
            mUserManager = (UserManagerService) IUserManager.Stub.asInterface(b);
        }
        return mUserManager;
    }

    AppOpsService getAppOpsService() {
        if (mAppOpsService == null) {
            IBinder b = ServiceManager.getService(Context.APP_OPS_SERVICE);
            mAppOpsService = (AppOpsService) IAppOpsService.Stub.asInterface(b);
        }
        return mAppOpsService;
    }

    boolean hasUserRestriction(String restriction, int userId) {
        return getUserManager().hasUserRestriction(restriction, userId);
    }

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

    RecentTasks getRecentTasks() {
        return mRecentTasks;
    }

    ClientLifecycleManager getLifecycleManager() {
        return mLifecycleManager;
    }

    ActivityStartController getActivityStartController() {
        return mActivityStartController;
    }

    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";
        enforceNotIsolatedCaller(reason);
        userId = handleIncomingUser(Binder.getCallingPid(), Binder.getCallingUid(), userId, reason);
        // TODO: Switch to user app stacks here.
        return 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) {
        enforceNotIsolatedCaller("startActivityAsUser");

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

        // TODO: Switch to user app stacks here.
        return 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) {
        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 = getTopDisplayFocusedStack();
            if (stack.mResumedActivity != null &&
                    stack.mResumedActivity.info.applicationInfo.uid == Binder.getCallingUid()) {
                mAppSwitchesAllowedTime = 0;
            }
        }
        return pir.sendInner(0, fillInIntent, resolvedType, whitelistToken, null, null,
                resultTo, resultWho, requestCode, flagsMask, flagsValues, bOptions);
    }

    @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.attachedToProcess()) {
                // 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 = getActivityStartController()
                    .obtainStarter(intent, "startNextMatchingActivity")
                    .setCaller(r.app.getThread())
                    .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) {
            enforceNotIsolatedCaller("startActivityAndWait");
            userId = handleIncomingUser(Binder.getCallingPid(), Binder.getCallingUid(),
                    userId, "startActivityAndWait");
            // TODO: Switch to user app stacks here.
            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) {
            enforceNotIsolatedCaller("startActivityWithConfig");
            userId = handleIncomingUser(Binder.getCallingPid(), Binder.getCallingUid(), userId,
                    "startActivityWithConfig");
            // TODO: Switch to user app stacks here.
            return 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.mUid) != SYSTEM_UID) {
                // This is still okay, as long as this activity is running under the
                // uid of the original calling activity.
                if (sourceRecord.app.mUid != sourceRecord.launchedFromUid) {
                    throw new SecurityException(
                            "Calling activity in uid " + sourceRecord.app.mUid
                                    + " 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.mUid);
        }

        // TODO: Switch to user app stacks here.
        try {
            return 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;
        }
    }

    int handleIncomingUser(int callingPid, int callingUid, int userId, String name) {
        return mAmInternal.handleIncomingUser(callingPid, callingUid, userId, false /* allowAll */,
                ALLOW_FULL_ONLY, name, null /* callerPackage */);
    }

    @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) {
        mAmInternal.enforceCallingPermission(BIND_VOICE_INTERACTION, "startVoiceActivity()");
        if (session == null || interactor == null) {
            throw new NullPointerException("null session or interactor");
        }
        userId = handleIncomingUser(callingPid, callingUid, userId, "startVoiceActivity");
        // TODO: Switch to user app stacks here.
        return 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) {
        mAmInternal.enforceCallingPermission(BIND_VOICE_INTERACTION, "startAssistantActivity()");
        userId = handleIncomingUser(callingPid, callingUid, userId, "startAssistantActivity");

        return 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) {
        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(this, mStackSupervisor,
                        getActivityStartController(), mWindowManager, callingPid);
                anim.startRecentsActivity(intent, recentsAnimationRunner, recentsComponent,
                        recentsUid, assistDataReceiver);
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    @Override
    public final int startActivityFromRecents(int taskId, Bundle bOptions) {
        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;
            }

            // TODO: There is a dup. of this block of code in ActivityStack.navigateUpToLocked
            // We should consolidate.
            if (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 = mController.activityResuming(next.packageName);
                    } catch (RemoteException e) {
                        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");
                    }
                    // Explicitly dismissing the activity so reset its relaunch flag.
                    r.mRelaunchReason = ActivityRecord.RELAUNCH_REASON_NONE;
                } 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();
        try {
            WindowProcessController proc = null;
            synchronized (mGlobalLock) {
                ActivityStack stack = ActivityRecord.getStackLocked(token);
                if (stack == null) {
                    return;
                }
                final ActivityRecord r = mStackSupervisor.activityIdleInternalLocked(token,
                        false /* fromTimeout */, false /* processPausingActivities */, config);
                if (r != null) {
                    proc = r.app;
                }
                if (stopProfiling && proc != null) {
                    proc.clearProfilerIfNeeded();
                }
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

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

        mAmInternal.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.isResumedActivityOnDisplay()) {
                if (DEBUG_IMMERSIVE) Slog.d(TAG_IMMERSIVE, "Frontmost changed immersion: "+ r);
                applyUpdateLockStateLocked(r);
            }
        }
    }

    void applyUpdateLockStateLocked(ActivityRecord r) {
        // Modifications to the UpdateLock state are done on our handler, outside
        // the activity manager's locks.  The new state is determined based on the
        // state *now* of the relevant activity record.  The object is passed to
        // the handler solely for logging detail, not to be consulted/modified.
        final boolean nextState = r != null && r.immersive;
        mH.post(() -> {
            if (mUpdateLock.isHeld() != nextState) {
                if (DEBUG_IMMERSIVE) Slog.d(TAG_IMMERSIVE,
                        "Applying new update lock state '" + nextState + "' for " + r);
                if (nextState) {
                    mUpdateLock.acquire();
                } else {
                    mUpdateLock.release();
                }
            }
        });
    }

    @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() {
        enforceNotIsolatedCaller("isTopActivityImmersive");
        synchronized (mGlobalLock) {
            final ActivityRecord r = getTopDisplayFocusedStack().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)) {
                mWindowManager.overridePendingAppTransition(packageName,
                        enterAnim, exitAnim, null);
            }

            Binder.restoreCallingIdentity(origId);
        }
    }

    @Override
    public int getFrontActivityScreenCompatMode() {
        enforceNotIsolatedCaller("getFrontActivityScreenCompatMode");
        ApplicationInfo ai;
        synchronized (mGlobalLock) {
            final ActivityRecord r = getTopDisplayFocusedStack().topRunningActivityLocked();
            if (r == null) {
                return ActivityManager.COMPAT_MODE_UNKNOWN;
            }
            ai = r.info.applicationInfo;
        }

        return mAmInternal.getPackageScreenCompatMode(ai);
    }

    @Override
    public void setFrontActivityScreenCompatMode(int mode) {
        mAmInternal.enforceCallingPermission(android.Manifest.permission.SET_SCREEN_COMPATIBILITY,
                "setFrontActivityScreenCompatMode");
        ApplicationInfo ai;
        synchronized (mGlobalLock) {
            final ActivityRecord r = getTopDisplayFocusedStack().topRunningActivityLocked();
            if (r == null) {
                Slog.w(TAG, "setFrontActivityScreenCompatMode failed: no top activity");
                return;
            }
            ai = r.info.applicationInfo;
        }

        mAmInternal.setPackageScreenCompatMode(ai, 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);
                }
                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);
                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 {
        enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "getStackInfo()");
        long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                ActivityStack focusedStack = getTopDisplayFocusedStack();
                if (focusedStack != null) {
                    return mStackSupervisor.getStackInfo(focusedStack.mStackId);
                }
                return null;
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public void setFocusedStack(int stackId) {
        mAmInternal.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) {
        mAmInternal.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) {
        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) {
        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) {
        mAmInternal.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) {
            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;
        }
        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 (mGlobalLock) {
            ActivityRecord r = getCallingRecordLocked(token);
            return r != null ? r.info.packageName : null;
        }
    }

    @Override
    public ComponentName getCallingActivity(IBinder token) {
        synchronized (mGlobalLock) {
            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() {
        mAmInternal.enforceCallingPermission(android.Manifest.permission.FORCE_BACK, "unhandledBack()");

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

    /**
     * TODO: Add mController hook
     */
    @Override
    public void moveTaskToFront(int taskId, int flags, Bundle bOptions) {
        mAmInternal.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 (!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);
    }

    boolean checkAppSwitchAllowedLocked(int sourcePid, int sourceUid,
            int callingPid, int callingUid, String name) {
        if (mAppSwitchesAllowedTime < SystemClock.uptimeMillis()) {
            return true;
        }

        if (getRecentTasks().isCallerRecents(sourceUid)) {
            return true;
        }

        int perm = checkComponentPermission(STOP_APP_SWITCHES, sourcePid, sourceUid, -1, true);
        if (perm == PackageManager.PERMISSION_GRANTED) {
            return true;
        }
        if (checkAllowAppSwitchUid(sourceUid)) {
            return true;
        }

        // If the actual IPC caller is different from the logical source, then
        // also see if they are allowed to control app switches.
        if (callingUid != -1 && callingUid != sourceUid) {
            perm = checkComponentPermission(STOP_APP_SWITCHES, callingPid, callingUid, -1, true);
            if (perm == PackageManager.PERMISSION_GRANTED) {
                return true;
            }
            if (checkAllowAppSwitchUid(callingUid)) {
                return true;
            }
        }

        Slog.w(TAG, name + " request from " + sourceUid + " stopped");
        return false;
    }

    private boolean checkAllowAppSwitchUid(int uid) {
        ArrayMap<String, Integer> types = mAllowAppSwitchUids.get(UserHandle.getUserId(uid));
        if (types != null) {
            for (int i = types.size() - 1; i >= 0; i--) {
                if (types.valueAt(i).intValue() == uid) {
                    return true;
                }
            }
        }
        return false;
    }

    @Override
    public void setActivityController(IActivityController controller, boolean imAMonkey) {
        mAmInternal.enforceCallingPermission(android.Manifest.permission.SET_ACTIVITY_WATCHER,
                "setActivityController()");
        synchronized (mGlobalLock) {
            mController = controller;
            mControllerIsAMonkey = imAMonkey;
            Watchdog.getInstance().setActivityController(controller);
        }
    }

    boolean isControllerAMonkey() {
        synchronized (mGlobalLock) {
            return mController != null && mControllerIsAMonkey;
        }
    }

    @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 = 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 (mGlobalLock) {
            ActivityStack stack = ActivityRecord.getStackLocked(token);
            if (stack != null) {
                return stack.willActivityBeVisibleLocked(token);
            }
            return false;
        }
    }

    @Override
    public void moveTaskToStack(int taskId, int stackId, boolean toTop) {
        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()) {
                    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) {
        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) {
        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");
                }

                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) {
        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) {
        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 = handleIncomingUser(Binder.getCallingPid(), callingUid, userId, "getRecentTasks");
        final boolean allowed = isGetTasksAllowed("getRecentTasks", Binder.getCallingPid(),
                callingUid);
        final boolean detailed = checkGetTasksPermission(
                android.Manifest.permission.GET_DETAILED_TASKS, Binder.getCallingPid(),
                UserHandle.getAppId(callingUid))
                == PackageManager.PERMISSION_GRANTED;

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

    @Override
    public List<ActivityManager.StackInfo> getAllStackInfos() {
        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) {
        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) {
        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)
                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 {
        mAmInternal.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 {
        mAmInternal.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.getTopDisplayFocusedStack();
        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.attachedToProcess()) {
                    try {
                        r.app.getThread().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);
            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);
                mAmInternal.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() != mThumbnailWidth
                        || thumbnail.getHeight() != mThumbnailHeight) {
                    throw new IllegalArgumentException("Bad thumbnail size: got "
                            + thumbnail.getWidth() + "x" + thumbnail.getHeight() + ", require "
                            + mThumbnailWidth + "x" + 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(mThumbnailWidth, 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) {
        mAmInternal.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 {
                WindowProcessController app =
                        mAm.getRecordForAppLocked(appInt).getWindowProcessController();
                mStackSupervisor.releaseSomeActivitiesLocked(app, "low-mem");
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    @Override
    public void setLockScreenShown(boolean keyguardShowing, boolean aodShowing,
            int secondaryDisplayShowing) {
        if (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);
            }
        }

        mH.post(() -> {
            for (int i = mScreenObservers.size() - 1; i >= 0; i--) {
                mScreenObservers.get(i).onKeyguardStateChanged(keyguardShowing);
            }
        });
    }

    void onScreenAwakeChanged(boolean isAwake) {
        mH.post(() -> {
            for (int i = mScreenObservers.size() - 1; i >= 0; i--) {
                mScreenObservers.get(i).onAwakeStateChanged(isAwake);
            }
        });
    }

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

        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) {
        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");
        }
        mWindowManager.prepareAppTransition(TRANSIT_TASK_IN_PLACE, false);
        mWindowManager.overridePendingAppTransitionInPlace(activityOptions.getPackageName(),
                activityOptions.getCustomInPlaceResId());
        mWindowManager.executeAppTransition();
    }

    @Override
    public void removeStack(int stackId) {
        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) {
        mAmInternal.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 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) {
        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) {
        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);
            mUiHandler.removeCallbacks(pae);
        }
        return pae.extras;
    }

    /**
     * Binder IPC calls go through the public entry point.
     * This can be called with or without the global lock held.
     */
    private static int checkCallingPermission(String permission) {
        return checkPermission(
                permission, Binder.getCallingPid(), UserHandle.getAppId(Binder.getCallingUid()));
    }

    /** This can be called with or without the global lock held. */
    void enforceCallerIsRecentsOrHasPermission(String permission, String func) {
        if (!getRecentTasks().isCallerRecents(Binder.getCallingUid())) {
            mAmInternal.enforceCallingPermission(permission, func);
        }
    }

    @VisibleForTesting
    int checkGetTasksPermission(String permission, int pid, int uid) {
        return checkPermission(permission, pid, uid);
    }

    static int checkPermission(String permission, int pid, int uid) {
        if (permission == null) {
            return PackageManager.PERMISSION_DENIED;
        }
        return checkComponentPermission(permission, pid, uid, -1, true);
    }

    boolean isGetTasksAllowed(String caller, int callingPid, int callingUid) {
        if (getRecentTasks().isCallerRecents(callingUid)) {
            // Always allow the recents component to get tasks
            return true;
        }

        boolean allowed = checkGetTasksPermission(android.Manifest.permission.REAL_GET_TASKS,
                callingPid, callingUid) == PackageManager.PERMISSION_GRANTED;
        if (!allowed) {
            if (checkGetTasksPermission(android.Manifest.permission.GET_TASKS,
                    callingPid, callingUid) == PackageManager.PERMISSION_GRANTED) {
                // Temporary compatibility: some existing apps on the system image may
                // still be requesting the old permission and not switched to the new
                // one; if so, we'll still allow them full access.  This means we need
                // to see if they are holding the old permission and are a system app.
                try {
                    if (AppGlobals.getPackageManager().isUidPrivileged(callingUid)) {
                        allowed = true;
                        if (DEBUG_TASKS) Slog.w(TAG, caller + ": caller " + callingUid
                                + " is using old GET_TASKS but privileged; allowing");
                    }
                } catch (RemoteException e) {
                }
            }
            if (DEBUG_TASKS) Slog.w(TAG, caller + ": caller " + callingUid
                    + " does not hold REAL_GET_TASKS; limiting output");
        }
        return allowed;
    }

    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) {
        mAmInternal.enforceCallingPermission(android.Manifest.permission.GET_TOP_ACTIVITY_INFO,
                "enqueueAssistContext()");

        synchronized (mGlobalLock) {
            ActivityRecord activity = getTopDisplayFocusedStack().getTopActivity();
            if (activity == null) {
                Slog.w(TAG, "getAssistContextExtras failed: no top activity");
                return null;
            }
            if (!activity.attachedToProcess()) {
                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.attachedToProcess()) {
                    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.mUid);

            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.getThread().requestAssistContextExtras(activity.appToken, pae,
                        requestType, mViSessionId, flags);
                mPendingAssistExtras.add(pae);
                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 = getTopDisplayFocusedStack();
            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 = getTopDisplayFocusedStack().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;
        }
    }

    private void onLocalVoiceInteractionStartedLocked(IBinder activity,
            IVoiceInteractionSession voiceSession, IVoiceInteractor voiceInteractor) {
        ActivityRecord activityToCallback = ActivityRecord.forTokenLocked(activity);
        if (activityToCallback == null) return;
        activityToCallback.setVoiceSessionLocked(voiceSession);

        // Inform the activity
        try {
            activityToCallback.app.getThread().scheduleLocalVoiceInteractionStarted(activity,
                    voiceInteractor);
            long token = Binder.clearCallingIdentity();
            try {
                startRunningVoiceLocked(voiceSession, activityToCallback.appInfo.uid);
            } finally {
                Binder.restoreCallingIdentity(token);
            }
            // TODO: VI Should we cache the activity so that it's easier to find later
            // rather than scan through all the stacks and activities?
        } catch (RemoteException re) {
            activityToCallback.clearVoiceSessionLocked();
            // TODO: VI Should this terminate the voice session?
        }
    }

    private void startRunningVoiceLocked(IVoiceInteractionSession session, int targetUid) {
        Slog.d(TAG, "<<<  startRunningVoiceLocked()");
        mVoiceWakeLock.setWorkSource(new WorkSource(targetUid));
        if (mRunningVoice == null || mRunningVoice.asBinder() != session.asBinder()) {
            boolean wasRunningVoice = mRunningVoice != null;
            mRunningVoice = session;
            if (!wasRunningVoice) {
                mVoiceWakeLock.acquire();
                updateSleepIfNeededLocked();
            }
        }
    }

    void finishRunningVoiceLocked() {
        if (mRunningVoice != null) {
            mRunningVoice = null;
            mVoiceWakeLock.release();
            updateSleepIfNeededLocked();
        }
    }

    @Override
    public void setVoiceKeepAwake(IVoiceInteractionSession session, boolean keepAwake) {
        synchronized (mGlobalLock) {
            if (mRunningVoice != null && mRunningVoice.asBinder() == session.asBinder()) {
                if (keepAwake) {
                    mVoiceWakeLock.acquire();
                } else {
                    mVoiceWakeLock.release();
                }
            }
        }
    }

    @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) {
        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) {
        mAmInternal.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) {
        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.isTopDisplayFocusedStack(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) {
        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 {
        mAmInternal.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) {
        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) {
        enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS,
                "moveTopActivityToPinnedStack()");
        synchronized (mGlobalLock) {
            if (!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() {
                            mH.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 (!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()
                && !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) {
        enforceNotIsolatedCaller("getUriPermissionOwnerForActivity");
        synchronized (mGlobalLock) {
            ActivityRecord r = ActivityRecord.isInStackLocked(activityToken);
            if (r == null) {
                throw new IllegalArgumentException("Activity does not exist; token="
                        + activityToken);
            }
            return r.getUriPermissionsLocked().getExternalToken();
        }
    }

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

    /**
     * Check that we have the features required for VR-related API calls, and throw an exception if
     * not.
     */
    void enforceSystemHasVrFeature() {
        if (!mContext.getPackageManager().hasSystemFeature(
                PackageManager.FEATURE_VR_MODE_HIGH_PERFORMANCE)) {
            throw new UnsupportedOperationException("VR mode not supported on this device!");
        }
    }

    @Override
    public int setVrMode(IBinder token, boolean enabled, ComponentName packageName) {
        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.isResumedActivityOnDisplay()) {
                    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 = getTopDisplayFocusedStack().getTopActivity();
            if (ActivityRecord.forTokenLocked(callingActivity) != activity) {
                throw new SecurityException("Only focused activity can call startVoiceInteraction");
            }
            if (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) {
        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) {
        mAmInternal.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 && mWindowManager != null) {
                // sentinel: fetch the current configuration from the window manager
                values = mWindowManager.computeNewConfiguration(displayId);
            }

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

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

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

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

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

            final long origId = Binder.clearCallingIdentity();
            try {
                if (values != null) {
                    Settings.System.clearConfiguration(values);
                }
                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) {
            mAmInternal.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) {
        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) {
        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() {
        mAmInternal.enforceCallingPermission(
                Manifest.permission.INTERACT_ACROSS_USERS_FULL, "getLastResumedActivityUserId()");
        synchronized (mGlobalLock) {
            if (mLastResumedActivity == null) {
                return getCurrentUserId();
            }
            return mLastResumedActivity.userId;
        }
    }

    @Override
    public void updateLockTaskFeatures(int userId, int flags) {
        final int callingUid = Binder.getCallingUid();
        if (callingUid != 0 && callingUid != SYSTEM_UID) {
            mAmInternal.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) {
        mAmInternal.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) {
        mAmInternal.enforceCallingPermission(CONTROL_REMOTE_APP_TRANSITION_ANIMATIONS,
                "registerRemoteAnimationForNextActivityStart");
        adapter.setCallingPid(Binder.getCallingPid());
        synchronized (mGlobalLock) {
            final long origId = Binder.clearCallingIdentity();
            try {
                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) {
        enforceSystemHasVrFeature();
        synchronized (mGlobalLock) {
            synchronized (mAm.mPidsSelfLocked) {
                final int pid = Binder.getCallingPid();
                final ProcessRecord proc = mAm.mPidsSelfLocked.get(pid);
                mVrController.setVrThreadLocked(tid, pid, proc.getWindowProcessController());
            }
        }
    }

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

    @Override
    public void stopAppSwitches() {
        enforceCallerIsRecentsOrHasPermission(STOP_APP_SWITCHES, "stopAppSwitches");
        synchronized (mGlobalLock) {
            mAppSwitchesAllowedTime = SystemClock.uptimeMillis() + APP_SWITCH_DELAY_TIME;
            mDidAppSwitch = false;
            getActivityStartController().schedulePendingActivityLaunches(APP_SWITCH_DELAY_TIME);
        }
    }

    @Override
    public void resumeAppSwitches() {
        enforceCallerIsRecentsOrHasPermission(STOP_APP_SWITCHES, "resumeAppSwitches");
        synchronized (mGlobalLock) {
            // Note that we don't execute any pending app switches... we will
            // let those wait until either the timeout, or the next start
            // activity request.
            mAppSwitchesAllowedTime = 0;
        }
    }

    void onStartActivitySetDidAppSwitch() {
        if (mDidAppSwitch) {
            // This is the second allowed switch since we stopped switches, so now just generally
            // allow switches. Use case:
            // - user presses home (switches disabled, switch to home, mDidAppSwitch now true);
            // - user taps a home icon (coming from home so allowed, we hit here and now allow
            // anyone to switch again).
            mAppSwitchesAllowedTime = 0;
        } else {
            mDidAppSwitch = true;
        }
    }

    /** @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);
                }
            }
        });
    }

    ActivityStack getTopDisplayFocusedStack() {
        return mStackSupervisor.getTopDisplayFocusedStack();
    }

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

    void onTopProcChangedLocked(WindowProcessController 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 dumpSleepStates(PrintWriter pw, boolean testPssMode) {
        synchronized (mGlobalLock) {
            pw.println("  mSleepTokens=" + mStackSupervisor.mSleepTokens);
            if (mRunningVoice != null) {
                pw.println("  mRunningVoice=" + mRunningVoice);
                pw.println("  mVoiceWakeLock" + mVoiceWakeLock);
            }
            pw.println("  mSleeping=" + mSleeping);
            pw.println("  mShuttingDown=" + mShuttingDown + " mTestPssMode=" + testPssMode);
            pw.println("  mVrController=" + mVrController);
        }
    }

    void writeSleepStateToProto(ProtoOutputStream proto) {
        for (ActivityTaskManagerInternal.SleepToken st : mStackSupervisor.mSleepTokens) {
            proto.write(ActivityManagerServiceDumpProcessesProto.SleepStatus.SLEEP_TOKENS,
                    st.toString());
        }

        if (mRunningVoice != null) {
            final long vrToken = proto.start(
                    ActivityManagerServiceDumpProcessesProto.RUNNING_VOICE);
            proto.write(ActivityManagerServiceDumpProcessesProto.Voice.SESSION,
                    mRunningVoice.toString());
            mVoiceWakeLock.writeToProto(
                    proto, ActivityManagerServiceDumpProcessesProto.Voice.WAKELOCK);
            proto.end(vrToken);
        }

        proto.write(ActivityManagerServiceDumpProcessesProto.SleepStatus.SLEEPING, mSleeping);
        proto.write(ActivityManagerServiceDumpProcessesProto.SleepStatus.SHUTTING_DOWN,
                mShuttingDown);
        mVrController.writeToProto(proto, ActivityManagerServiceDumpProcessesProto.VR_CONTROLLER);
    }

    int getCurrentUserId() {
        return mAmInternal.getCurrentUserId();
    }

    private void enforceNotIsolatedCaller(String caller) {
        if (UserHandle.isIsolated(Binder.getCallingUid())) {
            throw new SecurityException("Isolated process not allowed to call " + caller);
        }
    }

    public Configuration getConfiguration() {
        Configuration ci;
        synchronized(mGlobalLock) {
            ci = new Configuration(getGlobalConfiguration());
            ci.userSetLocale = false;
        }
        return ci;
    }

    /**
     * Current global configuration information. Contains general settings for the entire system,
     * also corresponds to the merged configuration of the default display.
     */
    Configuration getGlobalConfiguration() {
        return mStackSupervisor.getConfiguration();
    }

    boolean updateConfigurationLocked(Configuration values, ActivityRecord starting,
            boolean initLocale) {
        return updateConfigurationLocked(values, starting, initLocale, false /* deferResume */);
    }

    boolean updateConfigurationLocked(Configuration values, ActivityRecord starting,
            boolean initLocale, boolean deferResume) {
        // pass UserHandle.USER_NULL as userId because we don't persist configuration for any user
        return updateConfigurationLocked(values, starting, initLocale, false /* persistent */,
                UserHandle.USER_NULL, deferResume);
    }

    void updatePersistentConfiguration(Configuration values, @UserIdInt int userId) {
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mGlobalLock) {
                updateConfigurationLocked(values, null, false, true, userId,
                        false /* deferResume */);
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    void updateUserConfiguration() {
        synchronized (mGlobalLock) {
            final Configuration configuration = new Configuration(getGlobalConfiguration());
            final int currentUserId = mAmInternal.getCurrentUserId();
            Settings.System.adjustConfigurationForUser(mContext.getContentResolver(), configuration,
                    currentUserId, Settings.System.canWrite(mContext));
            updateConfigurationLocked(configuration, null /* starting */, false /* initLocale */,
                    false /* persistent */, currentUserId, false /* deferResume */);
        }
    }

    private boolean updateConfigurationLocked(Configuration values, ActivityRecord starting,
            boolean initLocale, boolean persistent, int userId, boolean deferResume) {
        return updateConfigurationLocked(values, starting, initLocale, persistent, userId,
                deferResume, null /* result */);
    }

    /**
     * Do either or both things: (1) change the current configuration, and (2)
     * make sure the given activity is running with the (now) current
     * configuration.  Returns true if the activity has been left running, or
     * false if <var>starting</var> is being destroyed to match the new
     * configuration.
     *
     * @param userId is only used when persistent parameter is set to true to persist configuration
     *               for that particular user
     */
    boolean updateConfigurationLocked(Configuration values, ActivityRecord starting,
            boolean initLocale, boolean persistent, int userId, boolean deferResume,
            ActivityTaskManagerService.UpdateConfigurationResult result) {
        int changes = 0;
        boolean kept = true;

        if (mWindowManager != null) {
            mWindowManager.deferSurfaceLayout();
        }
        try {
            if (values != null) {
                changes = updateGlobalConfigurationLocked(values, initLocale, persistent, userId,
                        deferResume);
            }

            kept = ensureConfigAndVisibilityAfterUpdate(starting, changes);
        } finally {
            if (mWindowManager != null) {
                mWindowManager.continueSurfaceLayout();
            }
        }

        if (result != null) {
            result.changes = changes;
            result.activityRelaunched = !kept;
        }
        return kept;
    }

    /**
     * Returns true if this configuration change is interesting enough to send an
     * {@link Intent#ACTION_SPLIT_CONFIGURATION_CHANGED} broadcast.
     */
    private static boolean isSplitConfigurationChange(int configDiff) {
        return (configDiff & (ActivityInfo.CONFIG_LOCALE | ActivityInfo.CONFIG_DENSITY)) != 0;
    }

    /** Update default (global) configuration and notify listeners about changes. */
    private int updateGlobalConfigurationLocked(@NonNull Configuration values, boolean initLocale,
            boolean persistent, int userId, boolean deferResume) {
        mTempConfig.setTo(getGlobalConfiguration());
        final int changes = mTempConfig.updateFrom(values);
        if (changes == 0) {
            // Since calling to Activity.setRequestedOrientation leads to freezing the window with
            // setting WindowManagerService.mWaitingForConfig to true, it is important that we call
            // performDisplayOverrideConfigUpdate in order to send the new display configuration
            // (even if there are no actual changes) to unfreeze the window.
            performDisplayOverrideConfigUpdate(values, deferResume, DEFAULT_DISPLAY);
            return 0;
        }

        if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.i(TAG_CONFIGURATION,
                "Updating global configuration to: " + values);

        EventLog.writeEvent(EventLogTags.CONFIGURATION_CHANGED, changes);
        StatsLog.write(StatsLog.RESOURCE_CONFIGURATION_CHANGED,
                values.colorMode,
                values.densityDpi,
                values.fontScale,
                values.hardKeyboardHidden,
                values.keyboard,
                values.keyboardHidden,
                values.mcc,
                values.mnc,
                values.navigation,
                values.navigationHidden,
                values.orientation,
                values.screenHeightDp,
                values.screenLayout,
                values.screenWidthDp,
                values.smallestScreenWidthDp,
                values.touchscreen,
                values.uiMode);


        if (!initLocale && !values.getLocales().isEmpty() && values.userSetLocale) {
            final LocaleList locales = values.getLocales();
            int bestLocaleIndex = 0;
            if (locales.size() > 1) {
                if (mSupportedSystemLocales == null) {
                    mSupportedSystemLocales = Resources.getSystem().getAssets().getLocales();
                }
                bestLocaleIndex = Math.max(0, locales.getFirstMatchIndex(mSupportedSystemLocales));
            }
            SystemProperties.set("persist.sys.locale",
                    locales.get(bestLocaleIndex).toLanguageTag());
            LocaleList.setDefault(locales, bestLocaleIndex);
            mAm.mHandler.sendMessage(mAm.mHandler.obtainMessage(SEND_LOCALE_TO_MOUNT_DAEMON_MSG,
                    locales.get(bestLocaleIndex)));
        }

        mConfigurationSeq = Math.max(++mConfigurationSeq, 1);
        mTempConfig.seq = mConfigurationSeq;

        // Update stored global config and notify everyone about the change.
        mStackSupervisor.onConfigurationChanged(mTempConfig);

        Slog.i(TAG, "Config changes=" + Integer.toHexString(changes) + " " + mTempConfig);
        // TODO(multi-display): Update UsageEvents#Event to include displayId.
        mAm.mUsageStatsService.reportConfigurationChange(
                mTempConfig, mAmInternal.getCurrentUserId());

        // TODO: If our config changes, should we auto dismiss any currently showing dialogs?
        updateShouldShowDialogsLocked(mTempConfig);

        AttributeCache ac = AttributeCache.instance();
        if (ac != null) {
            ac.updateConfiguration(mTempConfig);
        }

        // Make sure all resources in our process are updated right now, so that anyone who is going
        // to retrieve resource values after we return will be sure to get the new ones. This is
        // especially important during boot, where the first config change needs to guarantee all
        // resources have that config before following boot code is executed.
        mAm.mSystemThread.applyConfigurationToResources(mTempConfig);

        // We need another copy of global config because we're scheduling some calls instead of
        // running them in place. We need to be sure that object we send will be handled unchanged.
        final Configuration configCopy = new Configuration(mTempConfig);
        if (persistent && Settings.System.hasInterestingConfigurationChanges(changes)) {
            Message msg = mAm.mHandler.obtainMessage(UPDATE_CONFIGURATION_MSG);
            msg.obj = configCopy;
            msg.arg1 = userId;
            mAm.mHandler.sendMessage(msg);
        }

        for (int i = mAm.mLruProcesses.size() - 1; i >= 0; i--) {
            ProcessRecord app = mAm.mLruProcesses.get(i);
            try {
                if (app.thread != null) {
                    if (DEBUG_CONFIGURATION) Slog.v(TAG_CONFIGURATION, "Sending to proc "
                            + app.processName + " new config " + configCopy);
                    getLifecycleManager().scheduleTransaction(app.thread,
                            ConfigurationChangeItem.obtain(configCopy));
                }
            } catch (Exception e) {
                Slog.e(TAG_CONFIGURATION, "Failed to schedule configuration change", e);
            }
        }

        Intent intent = new Intent(Intent.ACTION_CONFIGURATION_CHANGED);
        intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY | Intent.FLAG_RECEIVER_REPLACE_PENDING
                | Intent.FLAG_RECEIVER_FOREGROUND
                | Intent.FLAG_RECEIVER_VISIBLE_TO_INSTANT_APPS);
        mAm.broadcastIntentLocked(null, null, intent, null, null, 0, null, null, null,
                OP_NONE, null, false, false, MY_PID, SYSTEM_UID,
                UserHandle.USER_ALL);
        if ((changes & ActivityInfo.CONFIG_LOCALE) != 0) {
            intent = new Intent(Intent.ACTION_LOCALE_CHANGED);
            intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND
                    | Intent.FLAG_RECEIVER_INCLUDE_BACKGROUND
                    | Intent.FLAG_RECEIVER_VISIBLE_TO_INSTANT_APPS);
            if (initLocale || !mAm.mProcessesReady) {
                intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
            }
            mAm.broadcastIntentLocked(null, null, intent, null, null, 0, null, null, null,
                    OP_NONE, null, false, false, MY_PID, SYSTEM_UID,
                    UserHandle.USER_ALL);
        }

        // Send a broadcast to PackageInstallers if the configuration change is interesting
        // for the purposes of installing additional splits.
        if (!initLocale && isSplitConfigurationChange(changes)) {
            intent = new Intent(Intent.ACTION_SPLIT_CONFIGURATION_CHANGED);
            intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING
                    | Intent.FLAG_RECEIVER_INCLUDE_BACKGROUND);

            // Typically only app stores will have this permission.
            String[] permissions = new String[] { android.Manifest.permission.INSTALL_PACKAGES };
            mAm.broadcastIntentLocked(null, null, intent, null, null, 0, null, null, permissions,
                    OP_NONE, null, false, false, MY_PID, SYSTEM_UID, UserHandle.USER_ALL);
        }

        // Override configuration of the default display duplicates global config, so we need to
        // update it also. This will also notify WindowManager about changes.
        performDisplayOverrideConfigUpdate(mStackSupervisor.getConfiguration(), deferResume,
                DEFAULT_DISPLAY);

        return changes;
    }

    boolean updateDisplayOverrideConfigurationLocked(Configuration values, ActivityRecord starting,
            boolean deferResume, int displayId) {
        return updateDisplayOverrideConfigurationLocked(values, starting, deferResume /* deferResume */,
                displayId, null /* result */);
    }

    /**
     * Updates override configuration specific for the selected display. If no config is provided,
     * new one will be computed in WM based on current display info.
     */
    boolean updateDisplayOverrideConfigurationLocked(Configuration values,
            ActivityRecord starting, boolean deferResume, int displayId,
            ActivityTaskManagerService.UpdateConfigurationResult result) {
        int changes = 0;
        boolean kept = true;

        if (mWindowManager != null) {
            mWindowManager.deferSurfaceLayout();
        }
        try {
            if (values != null) {
                if (displayId == DEFAULT_DISPLAY) {
                    // Override configuration of the default display duplicates global config, so
                    // we're calling global config update instead for default display. It will also
                    // apply the correct override config.
                    changes = updateGlobalConfigurationLocked(values, false /* initLocale */,
                            false /* persistent */, UserHandle.USER_NULL /* userId */, deferResume);
                } else {
                    changes = performDisplayOverrideConfigUpdate(values, deferResume, displayId);
                }
            }

            kept = ensureConfigAndVisibilityAfterUpdate(starting, changes);
        } finally {
            if (mWindowManager != null) {
                mWindowManager.continueSurfaceLayout();
            }
        }

        if (result != null) {
            result.changes = changes;
            result.activityRelaunched = !kept;
        }
        return kept;
    }

    private int performDisplayOverrideConfigUpdate(Configuration values, boolean deferResume,
            int displayId) {
        mTempConfig.setTo(mStackSupervisor.getDisplayOverrideConfiguration(displayId));
        final int changes = mTempConfig.updateFrom(values);
        if (changes != 0) {
            Slog.i(TAG, "Override config changes=" + Integer.toHexString(changes) + " "
                    + mTempConfig + " for displayId=" + displayId);
            mStackSupervisor.setDisplayOverrideConfiguration(mTempConfig, displayId);

            final boolean isDensityChange = (changes & ActivityInfo.CONFIG_DENSITY) != 0;
            if (isDensityChange && displayId == DEFAULT_DISPLAY) {
                mAm.mAppWarnings.onDensityChanged();

                mAm.killAllBackgroundProcessesExcept(N,
                        ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE);
            }
        }

        // Update the configuration with WM first and check if any of the stacks need to be resized
        // due to the configuration change. If so, resize the stacks now and do any relaunches if
        // necessary. This way we don't need to relaunch again afterwards in
        // ensureActivityConfiguration().
        if (mWindowManager != null) {
            final int[] resizedStacks =
                    mWindowManager.setNewDisplayOverrideConfiguration(mTempConfig, displayId);
            if (resizedStacks != null) {
                for (int stackId : resizedStacks) {
                    resizeStackWithBoundsFromWindowManager(stackId, deferResume);
                }
            }
        }

        return changes;
    }

    private void updateEventDispatchingLocked(boolean booted) {
        mWindowManager.setEventDispatching(booted && !mShuttingDown);
    }

    void enableScreenAfterBoot(boolean booted) {
        EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_ENABLE_SCREEN,
                SystemClock.uptimeMillis());
        mWindowManager.enableScreenAfterBoot();

        synchronized (mGlobalLock) {
            updateEventDispatchingLocked(booted);
        }
    }

    boolean canShowErrorDialogs() {
        return mShowDialogs && !mSleeping && !mShuttingDown
                && !mKeyguardController.isKeyguardOrAodShowing(DEFAULT_DISPLAY)
                && !hasUserRestriction(UserManager.DISALLOW_SYSTEM_ERROR_DIALOGS,
                mAmInternal.getCurrentUserId())
                && !(UserManager.isDeviceInDemoMode(mContext)
                && mAmInternal.getCurrentUser().isDemo());
    }

    /**
     * Decide based on the configuration whether we should show the ANR,
     * crash, etc dialogs.  The idea is that if there is no affordance to
     * press the on-screen buttons, or the user experience would be more
     * greatly impacted than the crash itself, we shouldn't show the dialog.
     *
     * A thought: SystemUI might also want to get told about this, the Power
     * dialog / global actions also might want different behaviors.
     */
    private void updateShouldShowDialogsLocked(Configuration config) {
        final boolean inputMethodExists = !(config.keyboard == Configuration.KEYBOARD_NOKEYS
                && config.touchscreen == Configuration.TOUCHSCREEN_NOTOUCH
                && config.navigation == Configuration.NAVIGATION_NONAV);
        int modeType = config.uiMode & Configuration.UI_MODE_TYPE_MASK;
        final boolean uiModeSupportsDialogs = (modeType != Configuration.UI_MODE_TYPE_CAR
                && !(modeType == Configuration.UI_MODE_TYPE_WATCH && Build.IS_USER)
                && modeType != Configuration.UI_MODE_TYPE_TELEVISION
                && modeType != Configuration.UI_MODE_TYPE_VR_HEADSET);
        final boolean hideDialogsSet = Settings.Global.getInt(mContext.getContentResolver(),
                HIDE_ERROR_DIALOGS, 0) != 0;
        mShowDialogs = inputMethodExists && uiModeSupportsDialogs && !hideDialogsSet;
    }

    private void updateFontScaleIfNeeded(@UserIdInt int userId) {
        final float scaleFactor = Settings.System.getFloatForUser(mContext.getContentResolver(),
                FONT_SCALE, 1.0f, userId);

        synchronized (this) {
            if (getGlobalConfiguration().fontScale == scaleFactor) {
                return;
            }

            final Configuration configuration
                    = mWindowManager.computeNewConfiguration(DEFAULT_DISPLAY);
            configuration.fontScale = scaleFactor;
            updatePersistentConfiguration(configuration, userId);
        }
    }

    // Actually is sleeping or shutting down or whatever else in the future
    // is an inactive state.
    boolean isSleepingOrShuttingDownLocked() {
        return isSleepingLocked() || mShuttingDown;
    }

    boolean isSleepingLocked() {
        return mSleeping;
    }

    /**
     * Update AMS states when an activity is resumed. This should only be called by
     * {@link ActivityStack#onActivityStateChanged(
     * ActivityRecord, ActivityStack.ActivityState, String)} when an activity is resumed.
     */
    void setResumedActivityUncheckLocked(ActivityRecord r, String reason) {
        final TaskRecord task = r.getTask();
        if (task.isActivityTypeStandard()) {
            if (mCurAppTimeTracker != r.appTimeTracker) {
                // We are switching app tracking.  Complete the current one.
                if (mCurAppTimeTracker != null) {
                    mCurAppTimeTracker.stop();
                    mH.obtainMessage(
                            REPORT_TIME_TRACKER_MSG, mCurAppTimeTracker).sendToTarget();
                    mStackSupervisor.clearOtherAppTimeTrackers(r.appTimeTracker);
                    mCurAppTimeTracker = null;
                }
                if (r.appTimeTracker != null) {
                    mCurAppTimeTracker = r.appTimeTracker;
                    startTimeTrackingFocusedActivityLocked();
                }
            } else {
                startTimeTrackingFocusedActivityLocked();
            }
        } else {
            r.appTimeTracker = null;
        }
        // TODO: VI Maybe r.task.voiceInteractor || r.voiceInteractor != null
        // TODO: Probably not, because we don't want to resume voice on switching
        // back to this activity
        if (task.voiceInteractor != null) {
            startRunningVoiceLocked(task.voiceSession, r.info.applicationInfo.uid);
        } else {
            finishRunningVoiceLocked();

            if (mLastResumedActivity != null) {
                final IVoiceInteractionSession session;

                final TaskRecord lastResumedActivityTask = mLastResumedActivity.getTask();
                if (lastResumedActivityTask != null
                        && lastResumedActivityTask.voiceSession != null) {
                    session = lastResumedActivityTask.voiceSession;
                } else {
                    session = mLastResumedActivity.voiceSession;
                }

                if (session != null) {
                    // We had been in a voice interaction session, but now focused has
                    // move to something different.  Just finish the session, we can't
                    // return to it and retain the proper state and synchronization with
                    // the voice interaction service.
                    finishVoiceTask(session);
                }
            }
        }

        if (mLastResumedActivity != null && r.userId != mLastResumedActivity.userId) {
            mAmInternal.sendForegroundProfileChanged(r.userId);
        }
        updateResumedAppTrace(r);
        mLastResumedActivity = r;

        mWindowManager.setFocusedApp(r.appToken, true);

        applyUpdateLockStateLocked(r);
        applyUpdateVrModeLocked(r);

        EventLogTags.writeAmSetResumedActivity(
                r == null ? -1 : r.userId,
                r == null ? "NULL" : r.shortComponentName,
                reason);
    }

    ActivityTaskManagerInternal.SleepToken acquireSleepToken(String tag, int displayId) {
        synchronized (mGlobalLock) {
            final ActivityTaskManagerInternal.SleepToken token = mStackSupervisor.createSleepTokenLocked(tag, displayId);
            updateSleepIfNeededLocked();
            return token;
        }
    }

    void updateSleepIfNeededLocked() {
        final boolean shouldSleep = !mStackSupervisor.hasAwakeDisplay();
        final boolean wasSleeping = mSleeping;
        boolean updateOomAdj = false;

        if (!shouldSleep) {
            // If wasSleeping is true, we need to wake up activity manager state from when
            // we started sleeping. In either case, we need to apply the sleep tokens, which
            // will wake up stacks or put them to sleep as appropriate.
            if (wasSleeping) {
                mSleeping = false;
                StatsLog.write(StatsLog.ACTIVITY_MANAGER_SLEEP_STATE_CHANGED,
                        StatsLog.ACTIVITY_MANAGER_SLEEP_STATE_CHANGED__STATE__AWAKE);
                startTimeTrackingFocusedActivityLocked();
                mTopProcessState = ActivityManager.PROCESS_STATE_TOP;
                mStackSupervisor.comeOutOfSleepIfNeededLocked();
            }
            mStackSupervisor.applySleepTokensLocked(true /* applyToStacks */);
            if (wasSleeping) {
                updateOomAdj = true;
            }
        } else if (!mSleeping && shouldSleep) {
            mSleeping = true;
            StatsLog.write(StatsLog.ACTIVITY_MANAGER_SLEEP_STATE_CHANGED,
                    StatsLog.ACTIVITY_MANAGER_SLEEP_STATE_CHANGED__STATE__ASLEEP);
            if (mCurAppTimeTracker != null) {
                mCurAppTimeTracker.stop();
            }
            mTopProcessState = ActivityManager.PROCESS_STATE_TOP_SLEEPING;
            mStackSupervisor.goingToSleepLocked();
            updateResumedAppTrace(null /* resumed */);
            updateOomAdj = true;
        }
        if (updateOomAdj) {
            mH.post(mAmInternal::updateOomAdj);
        }
    }

    void updateOomAdj() {
        mH.post(mAmInternal::updateOomAdj);
    }

    // TODO(b/111541062): Update app time tracking to make it aware of multiple resumed activities
    private void startTimeTrackingFocusedActivityLocked() {
        final ActivityRecord resumedActivity = mStackSupervisor.getTopResumedActivity();
        if (!mSleeping && mCurAppTimeTracker != null && resumedActivity != null) {
            mCurAppTimeTracker.start(resumedActivity.packageName);
        }
    }

    private void updateResumedAppTrace(@Nullable ActivityRecord resumed) {
        if (mTracedResumedActivity != null) {
            Trace.asyncTraceEnd(TRACE_TAG_ACTIVITY_MANAGER,
                    constructResumedTraceName(mTracedResumedActivity.packageName), 0);
        }
        if (resumed != null) {
            Trace.asyncTraceBegin(TRACE_TAG_ACTIVITY_MANAGER,
                    constructResumedTraceName(resumed.packageName), 0);
        }
        mTracedResumedActivity = resumed;
    }

    private String constructResumedTraceName(String packageName) {
        return "focused app: " + packageName;
    }

    /** Helper method that requests bounds from WM and applies them to stack. */
    private void resizeStackWithBoundsFromWindowManager(int stackId, boolean deferResume) {
        final Rect newStackBounds = new Rect();
        final ActivityStack stack = mStackSupervisor.getStack(stackId);

        // TODO(b/71548119): Revert CL introducing below once cause of mismatch is found.
        if (stack == null) {
            final StringWriter writer = new StringWriter();
            final PrintWriter printWriter = new PrintWriter(writer);
            mStackSupervisor.dumpDisplays(printWriter);
            printWriter.flush();

            Log.wtf(TAG, "stack not found:" + stackId + " displays:" + writer);
        }

        stack.getBoundsForNewConfiguration(newStackBounds);
        mStackSupervisor.resizeStackLocked(
                stack, !newStackBounds.isEmpty() ? newStackBounds : null /* bounds */,
                null /* tempTaskBounds */, null /* tempTaskInsetBounds */,
                false /* preserveWindows */, false /* allowResizeInDockedMode */, deferResume);
    }

    /** Applies latest configuration and/or visibility updates if needed. */
    private boolean ensureConfigAndVisibilityAfterUpdate(ActivityRecord starting, int changes) {
        boolean kept = true;
        final ActivityStack mainStack = mStackSupervisor.getTopDisplayFocusedStack();
        // mainStack is null during startup.
        if (mainStack != null) {
            if (changes != 0 && starting == null) {
                // If the configuration changed, and the caller is not already
                // in the process of starting an activity, then find the top
                // activity to check if its configuration needs to change.
                starting = mainStack.topRunningActivityLocked();
            }

            if (starting != null) {
                kept = starting.ensureActivityConfiguration(changes,
                        false /* preserveWindow */);
                // And we need to make sure at this point that all other activities
                // are made visible with the correct configuration.
                mStackSupervisor.ensureActivitiesVisibleLocked(starting, changes,
                        !PRESERVE_WINDOWS);
            }
        }

        return kept;
    }

    void logAppTooSlow(WindowProcessController app, long startTime, String msg) {
        if (true || Build.IS_USER) {
            return;
        }

        StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();
        StrictMode.allowThreadDiskWrites();
        try {
            File tracesDir = new File("/data/anr");
            File tracesFile = null;
            try {
                tracesFile = File.createTempFile("app_slow", null, tracesDir);

                StringBuilder sb = new StringBuilder();
                Time tobj = new Time();
                tobj.set(System.currentTimeMillis());
                sb.append(tobj.format("%Y-%m-%d %H:%M:%S"));
                sb.append(": ");
                TimeUtils.formatDuration(SystemClock.uptimeMillis()-startTime, sb);
                sb.append(" since ");
                sb.append(msg);
                FileOutputStream fos = new FileOutputStream(tracesFile);
                fos.write(sb.toString().getBytes());
                if (app == null) {
                    fos.write("\n*** No application process!".getBytes());
                }
                fos.close();
                FileUtils.setPermissions(tracesFile.getPath(), 0666, -1, -1); // -rw-rw-rw-
            } catch (IOException e) {
                Slog.w(TAG, "Unable to prepare slow app traces file: " + tracesFile, e);
                return;
            }

            if (app != null && app.getPid() > 0) {
                ArrayList<Integer> firstPids = new ArrayList<Integer>();
                firstPids.add(app.getPid());
                dumpStackTraces(tracesFile.getAbsolutePath(), firstPids, null, null);
            }

            File lastTracesFile = null;
            File curTracesFile = null;
            for (int i=9; i>=0; i--) {
                String name = String.format(Locale.US, "slow%02d.txt", i);
                curTracesFile = new File(tracesDir, name);
                if (curTracesFile.exists()) {
                    if (lastTracesFile != null) {
                        curTracesFile.renameTo(lastTracesFile);
                    } else {
                        curTracesFile.delete();
                    }
                }
                lastTracesFile = curTracesFile;
            }
            tracesFile.renameTo(curTracesFile);
        } finally {
            StrictMode.setThreadPolicy(oldPolicy);
        }
    }

    final class H extends Handler {
        static final int REPORT_TIME_TRACKER_MSG = 1;

        public H(Looper looper) {
            super(looper, null, true);
        }

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case REPORT_TIME_TRACKER_MSG: {
                    AppTimeTracker tracker = (AppTimeTracker) msg.obj;
                    tracker.deliverResult(mContext);
                } break;
            }
        }
    }

    final class UiHandler extends Handler {
        static final int DISMISS_DIALOG_UI_MSG = 1;

        public UiHandler() {
            super(com.android.server.UiThread.get().getLooper(), null, true);
        }

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case DISMISS_DIALOG_UI_MSG: {
                    final Dialog d = (Dialog) msg.obj;
                    d.dismiss();
                    break;
                }
            }
        }
    }

    final class LocalService extends ActivityTaskManagerInternal {
        @Override
        public SleepToken acquireSleepToken(String tag, int displayId) {
            Preconditions.checkNotNull(tag);
            return ActivityTaskManagerService.this.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) {
                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 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 =
                        mWindowManager.getPendingAppTransition() != TRANSIT_NONE;
                if (!wasTransitionSet) {
                    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) {
                    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) {
                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 void registerScreenObserver(ScreenObserver observer) {
            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) {
            ActivityTaskManagerService.this.enforceCallerIsRecentsOrHasPermission(permission, func);
        }

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

        @Override
        public void setAllowAppSwitches(@NonNull String type, int uid, int userId) {
            if (!mAmInternal.isUserRunning(userId, ActivityManager.FLAG_OR_STOPPED)) {
                return;
            }
            synchronized (mGlobalLock) {
                ArrayMap<String, Integer> types = mAllowAppSwitchUids.get(userId);
                if (types == null) {
                    if (uid < 0) {
                        return;
                    }
                    types = new ArrayMap<>();
                    mAllowAppSwitchUids.put(userId, types);
                }
                if (uid < 0) {
                    types.remove(type);
                } else {
                    types.put(type, uid);
                }
            }
        }

        @Override
        public void onUserStopped(int userId) {
            synchronized (mGlobalLock) {
                getRecentTasks().unloadUserDataFromMemoryLocked(userId);
                mAllowAppSwitchUids.remove(userId);
            }
        }

        @Override
        public boolean isGetTasksAllowed(String caller, int callingPid, int callingUid) {
            synchronized (mGlobalLock) {
                return ActivityTaskManagerService.this.isGetTasksAllowed(
                        caller, callingPid, callingUid);
            }
        }

        @Override
        public void onProcessAdded(WindowProcessController proc) {
            synchronized (mGlobalLock) {
                mProcessNames.put(proc.mName, proc.mUid, proc);
            }
        }

        @Override
        public void onProcessRemoved(String name, int uid) {
            synchronized (mGlobalLock) {
                mProcessNames.remove(name, uid);
            }
        }

        @Override
        public void onCleanUpApplicationRecord(WindowProcessController proc) {
            synchronized (mGlobalLock) {
                if (proc == mHomeProcess) {
                    mHomeProcess = null;
                }
                if (proc == mPreviousProcess) {
                    mPreviousProcess = null;
                }
            }
        }

        @Override
        public int getTopProcessState() {
            synchronized (mGlobalLock) {
                return mTopProcessState;
            }
        }

        @Override
        public boolean isSleeping() {
            synchronized (mGlobalLock) {
                return isSleepingLocked();
            }
        }

        @Override
        public boolean isShuttingDown() {
            synchronized (mGlobalLock) {
                return mShuttingDown;
            }
        }

        @Override
        public boolean shuttingDown(boolean booted, int timeout) {
            synchronized (mGlobalLock) {
                mShuttingDown = true;
                mStackSupervisor.prepareForShutdownLocked();
                updateEventDispatchingLocked(booted);
                return mStackSupervisor.shutdownLocked(timeout);
            }
        }

        @Override
        public void enableScreenAfterBoot(boolean booted) {
            synchronized (mGlobalLock) {
                EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_ENABLE_SCREEN,
                        SystemClock.uptimeMillis());
                mWindowManager.enableScreenAfterBoot();
                updateEventDispatchingLocked(booted);
            }
        }

        @Override
        public boolean showStrictModeViolationDialog() {
            synchronized (mGlobalLock) {
                return mShowDialogs && !mSleeping && !mShuttingDown;
            }
        }

        @Override
        public void showSystemReadyErrorDialogsIfNeeded() {
            synchronized (mGlobalLock) {
                try {
                    if (AppGlobals.getPackageManager().hasSystemUidErrors()) {
                        Slog.e(TAG, "UIDs on the system are inconsistent, you need to wipe your"
                                + " data partition or your device will be unstable.");
                        mUiHandler.post(() -> {
                            if (mShowDialogs) {
                                AlertDialog d = new BaseErrorDialog(mUiContext);
                                d.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ERROR);
                                d.setCancelable(false);
                                d.setTitle(mUiContext.getText(R.string.android_system_label));
                                d.setMessage(mUiContext.getText(R.string.system_error_wipe_data));
                                d.setButton(DialogInterface.BUTTON_POSITIVE,
                                        mUiContext.getText(R.string.ok),
                                        mUiHandler.obtainMessage(DISMISS_DIALOG_UI_MSG, d));
                                d.show();
                            }
                        });
                    }
                } catch (RemoteException e) {
                }

                if (!Build.isBuildConsistent()) {
                    Slog.e(TAG, "Build fingerprint is not consistent, warning user");
                    mUiHandler.post(() -> {
                        if (mShowDialogs) {
                            AlertDialog d = new BaseErrorDialog(mUiContext);
                            d.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ERROR);
                            d.setCancelable(false);
                            d.setTitle(mUiContext.getText(R.string.android_system_label));
                            d.setMessage(mUiContext.getText(R.string.system_error_manufacturer));
                            d.setButton(DialogInterface.BUTTON_POSITIVE,
                                    mUiContext.getText(R.string.ok),
                                    mUiHandler.obtainMessage(DISMISS_DIALOG_UI_MSG, d));
                            d.show();
                        }
                    });
                }
            }
        }
    }
}