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

/*
 * Copyright (C) 2006 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.app.ActivityManager.StackId.DOCKED_STACK_ID;
import static android.app.ActivityManager.StackId.FREEFORM_WORKSPACE_STACK_ID;
import static android.app.ActivityManager.StackId.FULLSCREEN_WORKSPACE_STACK_ID;
import static android.app.ActivityManager.StackId.HOME_STACK_ID;
import static android.app.ActivityManager.StackId.INVALID_STACK_ID;
import static android.app.ActivityManager.StackId.PINNED_STACK_ID;
import static android.content.Intent.FLAG_ACTIVITY_NEW_DOCUMENT;
import static android.content.Intent.FLAG_ACTIVITY_RETAIN_IN_RECENTS;
import static android.content.pm.ActivityInfo.FLAG_RESIZEABLE;
import static android.content.pm.ActivityInfo.LOCK_TASK_LAUNCH_MODE_ALWAYS;
import static android.content.pm.ActivityInfo.LOCK_TASK_LAUNCH_MODE_DEFAULT;
import static android.content.pm.ActivityInfo.LOCK_TASK_LAUNCH_MODE_IF_WHITELISTED;
import static android.content.pm.ActivityInfo.LOCK_TASK_LAUNCH_MODE_NEVER;
import static android.content.pm.ApplicationInfo.PRIVATE_FLAG_PRIVILEGED;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_ADD_REMOVE;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_LOCKTASK;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_RECENTS;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_TASKS;
import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_ADD_REMOVE;
import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_LOCKTASK;
import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_RECENTS;
import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_TASKS;
import static com.android.server.am.ActivityManagerDebugConfig.TAG_AM;
import static com.android.server.am.ActivityManagerDebugConfig.TAG_WITH_CLASS_NAME;
import static com.android.server.am.ActivityManagerService.LOCK_SCREEN_SHOWN;
import static com.android.server.am.ActivityRecord.APPLICATION_ACTIVITY_TYPE;
import static com.android.server.am.ActivityRecord.HOME_ACTIVITY_TYPE;
import static com.android.server.am.ActivityRecord.RECENTS_ACTIVITY_TYPE;

import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityManager.StackId;
import android.app.ActivityManager.TaskDescription;
import android.app.ActivityManager.TaskThumbnail;
import android.app.ActivityManager.TaskThumbnailInfo;
import android.app.ActivityOptions;
import android.app.AppGlobals;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.ApplicationInfo;
import android.content.pm.IPackageManager;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.Point;
import android.graphics.Rect;
import android.os.Debug;
import android.os.ParcelFileDescriptor;
import android.os.RemoteException;
import android.os.UserHandle;
import android.service.voice.IVoiceInteractionSession;
import android.util.DisplayMetrics;
import android.util.Slog;

import com.android.internal.app.IVoiceInteractor;
import com.android.internal.util.XmlUtils;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlSerializer;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Objects;

final class TaskRecord {
    private static final String TAG = TAG_WITH_CLASS_NAME ? "TaskRecord" : TAG_AM;
    private static final String TAG_ADD_REMOVE = TAG + POSTFIX_ADD_REMOVE;
    private static final String TAG_RECENTS = TAG + POSTFIX_RECENTS;
    private static final String TAG_LOCKTASK = TAG + POSTFIX_LOCKTASK;
    private static final String TAG_TASKS = TAG + POSTFIX_TASKS;

    static final String ATTR_TASKID = "task_id";
    private static final String TAG_INTENT = "intent";
    private static final String TAG_AFFINITYINTENT = "affinity_intent";
    static final String ATTR_REALACTIVITY = "real_activity";
    static final String ATTR_REALACTIVITY_SUSPENDED = "real_activity_suspended";
    private static final String ATTR_ORIGACTIVITY = "orig_activity";
    private static final String TAG_ACTIVITY = "activity";
    private static final String ATTR_AFFINITY = "affinity";
    private static final String ATTR_ROOT_AFFINITY = "root_affinity";
    private static final String ATTR_ROOTHASRESET = "root_has_reset";
    private static final String ATTR_AUTOREMOVERECENTS = "auto_remove_recents";
    private static final String ATTR_ASKEDCOMPATMODE = "asked_compat_mode";
    private static final String ATTR_USERID = "user_id";
    private static final String ATTR_EFFECTIVE_UID = "effective_uid";
    private static final String ATTR_TASKTYPE = "task_type";
    private static final String ATTR_FIRSTACTIVETIME = "first_active_time";
    private static final String ATTR_LASTACTIVETIME = "last_active_time";
    private static final String ATTR_LASTDESCRIPTION = "last_description";
    private static final String ATTR_LASTTIMEMOVED = "last_time_moved";
    private static final String ATTR_NEVERRELINQUISH = "never_relinquish_identity";
    static final String ATTR_TASK_AFFILIATION = "task_affiliation";
    private static final String ATTR_PREV_AFFILIATION = "prev_affiliation";
    private static final String ATTR_NEXT_AFFILIATION = "next_affiliation";
    private static final String ATTR_TASK_AFFILIATION_COLOR = "task_affiliation_color";
    private static final String ATTR_CALLING_UID = "calling_uid";
    private static final String ATTR_CALLING_PACKAGE = "calling_package";
    private static final String ATTR_RESIZEABLE = "resizeable";
    private static final String ATTR_PRIVILEGED = "privileged";
    private static final String ATTR_NON_FULLSCREEN_BOUNDS = "non_fullscreen_bounds";

    private static final String TASK_THUMBNAIL_SUFFIX = "_task_thumbnail";

    static final boolean IGNORE_RETURN_TO_RECENTS = true;

    static final int INVALID_TASK_ID = -1;

    final int taskId;       // Unique identifier for this task.
    String affinity;        // The affinity name for this task, or null; may change identity.
    String rootAffinity;    // Initial base affinity, or null; does not change from initial root.
    final IVoiceInteractionSession voiceSession;    // Voice interaction session driving task
    final IVoiceInteractor voiceInteractor;         // Associated interactor to provide to app
    Intent intent;          // The original intent that started the task.
    Intent affinityIntent;  // Intent of affinity-moved activity that started this task.
    int effectiveUid;       // The current effective uid of the identity of this task.
    ComponentName origActivity; // The non-alias activity component of the intent.
    ComponentName realActivity; // The actual activity component that started the task.
    boolean realActivitySuspended; // True if the actual activity component that started the
                                   // task is suspended.
    long firstActiveTime;   // First time this task was active.
    long lastActiveTime;    // Last time this task was active, including sleep.
    boolean inRecents;      // Actually in the recents list?
    boolean isAvailable;    // Is the activity available to be launched?
    boolean rootWasReset;   // True if the intent at the root of the task had
                            // the FLAG_ACTIVITY_RESET_TASK_IF_NEEDED flag.
    boolean autoRemoveRecents;  // If true, we should automatically remove the task from
                                // recents when activity finishes
    boolean askedCompatMode;// Have asked the user about compat mode for this task.
    boolean hasBeenVisible; // Set if any activities in the task have been visible to the user.

    String stringName;      // caching of toString() result.
    int userId;             // user for which this task was created

    int numFullscreen;      // Number of fullscreen activities.

    boolean mResizeable;    // Activities in the task resizeable. Based on the resizable setting of
                            // the root activity.
    int mLockTaskMode;      // Which tasklock mode to launch this task in. One of
                            // ActivityManager.LOCK_TASK_LAUNCH_MODE_*
    private boolean mPrivileged;    // The root activity application of this task holds
                                    // privileged permissions.

    /** Can't be put in lockTask mode. */
    final static int LOCK_TASK_AUTH_DONT_LOCK = 0;
    /** Can enter app pinning with user approval. Can never start over existing lockTask task. */
    final static int LOCK_TASK_AUTH_PINNABLE = 1;
    /** Starts in LOCK_TASK_MODE_LOCKED automatically. Can start over existing lockTask task. */
    final static int LOCK_TASK_AUTH_LAUNCHABLE = 2;
    /** Can enter lockTask without user approval. Can start over existing lockTask task. */
    final static int LOCK_TASK_AUTH_WHITELISTED = 3;
    /** Priv-app that starts in LOCK_TASK_MODE_LOCKED automatically. Can start over existing
     * lockTask task. */
    final static int LOCK_TASK_AUTH_LAUNCHABLE_PRIV = 4;
    int mLockTaskAuth = LOCK_TASK_AUTH_PINNABLE;

    int mLockTaskUid = -1;  // The uid of the application that called startLockTask().

    // This represents the last resolved activity values for this task
    // NOTE: This value needs to be persisted with each task
    TaskDescription lastTaskDescription = new TaskDescription();

    /** List of all activities in the task arranged in history order */
    final ArrayList<ActivityRecord> mActivities;

    /** Current stack */
    ActivityStack stack;

    /** Takes on same set of values as ActivityRecord.mActivityType */
    int taskType;

    /** Takes on same value as first root activity */
    boolean isPersistable = false;
    int maxRecents;

    /** Only used for persistable tasks, otherwise 0. The last time this task was moved. Used for
     * determining the order when restoring. Sign indicates whether last task movement was to front
     * (positive) or back (negative). Absolute value indicates time. */
    long mLastTimeMoved = System.currentTimeMillis();

    /** Indication of what to run next when task exits. Use ActivityRecord types.
     * ActivityRecord.APPLICATION_ACTIVITY_TYPE indicates to resume the task below this one in the
     * task stack. */
    private int mTaskToReturnTo = APPLICATION_ACTIVITY_TYPE;

    /** If original intent did not allow relinquishing task identity, save that information */
    boolean mNeverRelinquishIdentity = true;

    // Used in the unique case where we are clearing the task in order to reuse it. In that case we
    // do not want to delete the stack when the task goes empty.
    private boolean mReuseTask = false;

    private Bitmap mLastThumbnail; // Last thumbnail captured for this item.
    private final File mLastThumbnailFile; // File containing last thumbnail.
    private final String mFilename;
    private TaskThumbnailInfo mLastThumbnailInfo;
    CharSequence lastDescription; // Last description captured for this item.

    int mAffiliatedTaskId; // taskId of parent affiliation or self if no parent.
    int mAffiliatedTaskColor; // color of the parent task affiliation.
    TaskRecord mPrevAffiliate; // previous task in affiliated chain.
    int mPrevAffiliateTaskId = INVALID_TASK_ID; // previous id for persistence.
    TaskRecord mNextAffiliate; // next task in affiliated chain.
    int mNextAffiliateTaskId = INVALID_TASK_ID; // next id for persistence.

    // For relaunching the task from recents as though it was launched by the original launcher.
    int mCallingUid;
    String mCallingPackage;

    final ActivityManagerService mService;

    // Whether or not this task covers the entire screen; by default tasks are fullscreen.
    boolean mFullscreen = true;

    // Bounds of the Task. null for fullscreen tasks.
    Rect mBounds = null;
    // Last non-fullscreen bounds the task was launched in or resized to.
    // The information is persisted and used to determine the appropriate stack to launch the
    // task into on restore.
    Rect mLastNonFullscreenBounds = null;
    // Minimal size for width/height of this task when it's resizeable. -1 means it should use the
    // default minimal size.
    final int mMinimalSize;

    // Ranking (from top) of this task among all visible tasks. (-1 means it's not visible)
    // This number will be assigned when we evaluate OOM scores for all visible tasks.
    int mLayerRank = -1;

    Configuration mOverrideConfig = Configuration.EMPTY;

    TaskRecord(ActivityManagerService service, int _taskId, ActivityInfo info, Intent _intent,
            IVoiceInteractionSession _voiceSession, IVoiceInteractor _voiceInteractor) {
        mService = service;
        mFilename = String.valueOf(_taskId) + TASK_THUMBNAIL_SUFFIX +
                TaskPersister.IMAGE_EXTENSION;
        userId = UserHandle.getUserId(info.applicationInfo.uid);
        mLastThumbnailFile = new File(TaskPersister.getUserImagesDir(userId), mFilename);
        mLastThumbnailInfo = new TaskThumbnailInfo();
        taskId = _taskId;
        mAffiliatedTaskId = _taskId;
        voiceSession = _voiceSession;
        voiceInteractor = _voiceInteractor;
        isAvailable = true;
        mActivities = new ArrayList<>();
        mCallingUid = info.applicationInfo.uid;
        mCallingPackage = info.packageName;
        setIntent(_intent, info);
        mMinimalSize = info != null && info.layout != null ? info.layout.minimalSize : -1;
    }

    TaskRecord(ActivityManagerService service, int _taskId, ActivityInfo info, Intent _intent,
            TaskDescription _taskDescription, TaskThumbnailInfo thumbnailInfo) {
        mService = service;
        mFilename = String.valueOf(_taskId) + TASK_THUMBNAIL_SUFFIX +
                TaskPersister.IMAGE_EXTENSION;
        userId = UserHandle.getUserId(info.applicationInfo.uid);
        mLastThumbnailFile = new File(TaskPersister.getUserImagesDir(userId), mFilename);
        mLastThumbnailInfo = thumbnailInfo;
        taskId = _taskId;
        mAffiliatedTaskId = _taskId;
        voiceSession = null;
        voiceInteractor = null;
        isAvailable = true;
        mActivities = new ArrayList<>();
        mCallingUid = info.applicationInfo.uid;
        mCallingPackage = info.packageName;
        setIntent(_intent, info);

        taskType = ActivityRecord.APPLICATION_ACTIVITY_TYPE;
        isPersistable = true;
        // Clamp to [1, max].
        maxRecents = Math.min(Math.max(info.maxRecents, 1),
                ActivityManager.getMaxAppRecentsLimitStatic());

        taskType = APPLICATION_ACTIVITY_TYPE;
        mTaskToReturnTo = HOME_ACTIVITY_TYPE;
        lastTaskDescription = _taskDescription;
        mMinimalSize = info != null && info.layout != null ? info.layout.minimalSize : -1;
    }

    private TaskRecord(ActivityManagerService service, int _taskId, Intent _intent,
            Intent _affinityIntent, String _affinity, String _rootAffinity,
            ComponentName _realActivity, ComponentName _origActivity, boolean _rootWasReset,
            boolean _autoRemoveRecents, boolean _askedCompatMode, int _taskType, int _userId,
            int _effectiveUid, String _lastDescription, ArrayList<ActivityRecord> activities,
            long _firstActiveTime, long _lastActiveTime, long lastTimeMoved,
            boolean neverRelinquishIdentity, TaskDescription _lastTaskDescription,
            TaskThumbnailInfo lastThumbnailInfo, int taskAffiliation, int prevTaskId,
            int nextTaskId, int taskAffiliationColor, int callingUid, String callingPackage,
            boolean resizeable, boolean privileged, boolean realActivitySuspended) {
        mService = service;
        mFilename = String.valueOf(_taskId) + TASK_THUMBNAIL_SUFFIX +
                TaskPersister.IMAGE_EXTENSION;
        mLastThumbnailFile = new File(TaskPersister.getUserImagesDir(_userId), mFilename);
        mLastThumbnailInfo = lastThumbnailInfo;
        taskId = _taskId;
        intent = _intent;
        affinityIntent = _affinityIntent;
        affinity = _affinity;
        rootAffinity = _rootAffinity;
        voiceSession = null;
        voiceInteractor = null;
        realActivity = _realActivity;
        realActivitySuspended = realActivitySuspended;
        origActivity = _origActivity;
        rootWasReset = _rootWasReset;
        isAvailable = true;
        autoRemoveRecents = _autoRemoveRecents;
        askedCompatMode = _askedCompatMode;
        taskType = _taskType;
        mTaskToReturnTo = HOME_ACTIVITY_TYPE;
        userId = _userId;
        effectiveUid = _effectiveUid;
        firstActiveTime = _firstActiveTime;
        lastActiveTime = _lastActiveTime;
        lastDescription = _lastDescription;
        mActivities = activities;
        mLastTimeMoved = lastTimeMoved;
        mNeverRelinquishIdentity = neverRelinquishIdentity;
        lastTaskDescription = _lastTaskDescription;
        mAffiliatedTaskId = taskAffiliation;
        mAffiliatedTaskColor = taskAffiliationColor;
        mPrevAffiliateTaskId = prevTaskId;
        mNextAffiliateTaskId = nextTaskId;
        mCallingUid = callingUid;
        mCallingPackage = callingPackage;
        mResizeable = resizeable || mService.mForceResizableActivities;
        mPrivileged = privileged;
        ActivityInfo info = (mActivities.size() > 0) ? mActivities.get(0).info : null;
        mMinimalSize = info != null && info.layout != null ? info.layout.minimalSize : -1;
    }

    void touchActiveTime() {
        lastActiveTime = System.currentTimeMillis();
        if (firstActiveTime == 0) {
            firstActiveTime = lastActiveTime;
        }
    }

    long getInactiveDuration() {
        return System.currentTimeMillis() - lastActiveTime;
    }

    /** Sets the original intent, and the calling uid and package. */
    void setIntent(ActivityRecord r) {
        mCallingUid = r.launchedFromUid;
        mCallingPackage = r.launchedFromPackage;
        setIntent(r.intent, r.info);
    }

    /** Sets the original intent, _without_ updating the calling uid or package. */
    private void setIntent(Intent _intent, ActivityInfo info) {
        if (intent == null) {
            mNeverRelinquishIdentity =
                    (info.flags & ActivityInfo.FLAG_RELINQUISH_TASK_IDENTITY) == 0;
        } else if (mNeverRelinquishIdentity) {
            return;
        }

        affinity = info.taskAffinity;
        if (intent == null) {
            // If this task already has an intent associated with it, don't set the root
            // affinity -- we don't want it changing after initially set, but the initially
            // set value may be null.
            rootAffinity = affinity;
        }
        effectiveUid = info.applicationInfo.uid;
        stringName = null;

        if (info.targetActivity == null) {
            if (_intent != null) {
                // If this Intent has a selector, we want to clear it for the
                // recent task since it is not relevant if the user later wants
                // to re-launch the app.
                if (_intent.getSelector() != null || _intent.getSourceBounds() != null) {
                    _intent = new Intent(_intent);
                    _intent.setSelector(null);
                    _intent.setSourceBounds(null);
                }
            }
            if (DEBUG_TASKS) Slog.v(TAG_TASKS, "Setting Intent of " + this + " to " + _intent);
            intent = _intent;
            realActivity = _intent != null ? _intent.getComponent() : null;
            origActivity = null;
        } else {
            ComponentName targetComponent = new ComponentName(
                    info.packageName, info.targetActivity);
            if (_intent != null) {
                Intent targetIntent = new Intent(_intent);
                targetIntent.setComponent(targetComponent);
                targetIntent.setSelector(null);
                targetIntent.setSourceBounds(null);
                if (DEBUG_TASKS) Slog.v(TAG_TASKS,
                        "Setting Intent of " + this + " to target " + targetIntent);
                intent = targetIntent;
                realActivity = targetComponent;
                origActivity = _intent.getComponent();
            } else {
                intent = null;
                realActivity = targetComponent;
                origActivity = new ComponentName(info.packageName, info.name);
            }
        }

        final int intentFlags = intent == null ? 0 : intent.getFlags();
        if ((intentFlags & Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED) != 0) {
            // Once we are set to an Intent with this flag, we count this
            // task as having a true root activity.
            rootWasReset = true;
        }

        userId = UserHandle.getUserId(info.applicationInfo.uid);
        if ((info.flags & ActivityInfo.FLAG_AUTO_REMOVE_FROM_RECENTS) != 0) {
            // If the activity itself has requested auto-remove, then just always do it.
            autoRemoveRecents = true;
        } else if ((intentFlags & (FLAG_ACTIVITY_NEW_DOCUMENT | FLAG_ACTIVITY_RETAIN_IN_RECENTS))
                == FLAG_ACTIVITY_NEW_DOCUMENT) {
            // If the caller has not asked for the document to be retained, then we may
            // want to turn on auto-remove, depending on whether the target has set its
            // own document launch mode.
            if (info.documentLaunchMode != ActivityInfo.DOCUMENT_LAUNCH_NONE) {
                autoRemoveRecents = false;
            } else {
                autoRemoveRecents = true;
            }
        } else {
            autoRemoveRecents = false;
        }
        mResizeable = (info.flags & FLAG_RESIZEABLE) != 0 || mService.mForceResizableActivities;
        mLockTaskMode = info.lockTaskLaunchMode;
        mPrivileged = (info.applicationInfo.privateFlags & PRIVATE_FLAG_PRIVILEGED) != 0;
        setLockTaskAuth();
    }

    void setTaskToReturnTo(int taskToReturnTo) {
        mTaskToReturnTo = (IGNORE_RETURN_TO_RECENTS && taskToReturnTo == RECENTS_ACTIVITY_TYPE)
            ? HOME_ACTIVITY_TYPE : taskToReturnTo;
    }

    int getTaskToReturnTo() {
        return mTaskToReturnTo;
    }

    void setPrevAffiliate(TaskRecord prevAffiliate) {
        mPrevAffiliate = prevAffiliate;
        mPrevAffiliateTaskId = prevAffiliate == null ? INVALID_TASK_ID : prevAffiliate.taskId;
    }

    void setNextAffiliate(TaskRecord nextAffiliate) {
        mNextAffiliate = nextAffiliate;
        mNextAffiliateTaskId = nextAffiliate == null ? INVALID_TASK_ID : nextAffiliate.taskId;
    }

    // Close up recents linked list.
    void closeRecentsChain() {
        if (mPrevAffiliate != null) {
            mPrevAffiliate.setNextAffiliate(mNextAffiliate);
        }
        if (mNextAffiliate != null) {
            mNextAffiliate.setPrevAffiliate(mPrevAffiliate);
        }
        setPrevAffiliate(null);
        setNextAffiliate(null);
    }

    void removedFromRecents() {
        disposeThumbnail();
        closeRecentsChain();
        if (inRecents) {
            inRecents = false;
            mService.notifyTaskPersisterLocked(this, false);
        }
    }

    void setTaskToAffiliateWith(TaskRecord taskToAffiliateWith) {
        closeRecentsChain();
        mAffiliatedTaskId = taskToAffiliateWith.mAffiliatedTaskId;
        mAffiliatedTaskColor = taskToAffiliateWith.mAffiliatedTaskColor;
        // Find the end
        while (taskToAffiliateWith.mNextAffiliate != null) {
            final TaskRecord nextRecents = taskToAffiliateWith.mNextAffiliate;
            if (nextRecents.mAffiliatedTaskId != mAffiliatedTaskId) {
                Slog.e(TAG, "setTaskToAffiliateWith: nextRecents=" + nextRecents + " affilTaskId="
                        + nextRecents.mAffiliatedTaskId + " should be " + mAffiliatedTaskId);
                if (nextRecents.mPrevAffiliate == taskToAffiliateWith) {
                    nextRecents.setPrevAffiliate(null);
                }
                taskToAffiliateWith.setNextAffiliate(null);
                break;
            }
            taskToAffiliateWith = nextRecents;
        }
        taskToAffiliateWith.setNextAffiliate(this);
        setPrevAffiliate(taskToAffiliateWith);
        setNextAffiliate(null);
    }

    /**
     * Sets the last thumbnail with the current task bounds and the system orientation.
     * @return whether the thumbnail was set
     */
    boolean setLastThumbnailLocked(Bitmap thumbnail) {
        final Configuration serviceConfig = mService.mConfiguration;
        int taskWidth = 0;
        int taskHeight = 0;
        if (mBounds != null) {
            // Non-fullscreen tasks
            taskWidth = mBounds.width();
            taskHeight = mBounds.height();
        } else if (stack != null) {
            // Fullscreen tasks
            final Point displaySize = new Point();
            stack.getDisplaySize(displaySize);
            taskWidth = displaySize.x;
            taskHeight = displaySize.y;
        } else {
            Slog.e(TAG, "setLastThumbnailLocked() called on Task without stack");
        }
        return setLastThumbnailLocked(thumbnail, taskWidth, taskHeight, serviceConfig.orientation);
    }

    /**
     * Sets the last thumbnail with the current task bounds.
     * @return whether the thumbnail was set
     */
    private boolean setLastThumbnailLocked(Bitmap thumbnail, int taskWidth, int taskHeight,
            int screenOrientation) {
        if (mLastThumbnail != thumbnail) {
            mLastThumbnail = thumbnail;
            mLastThumbnailInfo.taskWidth = taskWidth;
            mLastThumbnailInfo.taskHeight = taskHeight;
            mLastThumbnailInfo.screenOrientation = screenOrientation;
            if (thumbnail == null) {
                if (mLastThumbnailFile != null) {
                    mLastThumbnailFile.delete();
                }
            } else {
                mService.mRecentTasks.saveImage(thumbnail, mLastThumbnailFile.getAbsolutePath());
            }
            return true;
        }
        return false;
    }

    void getLastThumbnail(TaskThumbnail thumbs) {
        thumbs.mainThumbnail = mLastThumbnail;
        thumbs.thumbnailInfo = mLastThumbnailInfo;
        thumbs.thumbnailFileDescriptor = null;
        if (mLastThumbnail == null) {
            thumbs.mainThumbnail = mService.mRecentTasks.getImageFromWriteQueue(
                    mLastThumbnailFile.getAbsolutePath());
        }
        // Only load the thumbnail file if we don't have a thumbnail
        if (thumbs.mainThumbnail == null && mLastThumbnailFile.exists()) {
            try {
                thumbs.thumbnailFileDescriptor = ParcelFileDescriptor.open(mLastThumbnailFile,
                        ParcelFileDescriptor.MODE_READ_ONLY);
            } catch (IOException e) {
            }
        }
    }

    /**
     * Removes in-memory thumbnail data when the max number of in-memory task thumbnails is reached.
     */
    void freeLastThumbnail() {
        mLastThumbnail = null;
    }

    /**
     * Removes all associated thumbnail data when a task is removed or pruned from recents.
     */
    void disposeThumbnail() {
        mLastThumbnailInfo.reset();
        mLastThumbnail = null;
        lastDescription = null;
    }

    /** Returns the intent for the root activity for this task */
    Intent getBaseIntent() {
        return intent != null ? intent : affinityIntent;
    }

    /** Returns the first non-finishing activity from the root. */
    ActivityRecord getRootActivity() {
        for (int i = 0; i < mActivities.size(); i++) {
            final ActivityRecord r = mActivities.get(i);
            if (r.finishing) {
                continue;
            }
            return r;
        }
        return null;
    }

    ActivityRecord getTopActivity() {
        for (int i = mActivities.size() - 1; i >= 0; --i) {
            final ActivityRecord r = mActivities.get(i);
            if (r.finishing) {
                continue;
            }
            return r;
        }
        return null;
    }

    ActivityRecord topRunningActivityLocked() {
        if (stack != null) {
            for (int activityNdx = mActivities.size() - 1; activityNdx >= 0; --activityNdx) {
                ActivityRecord r = mActivities.get(activityNdx);
                if (!r.finishing && stack.okToShowLocked(r)) {
                    return r;
                }
            }
        }
        return null;
    }

    void setFrontOfTask() {
        setFrontOfTask(null);
    }

    /** Call after activity movement or finish to make sure that frontOfTask is set correctly */
    void setFrontOfTask(ActivityRecord newTop) {
        // If a top candidate is suggested by the caller, go ahead and use it and mark all others
        // as not front. This is needed in situations where the current front activity in the
        // task isn't finished yet and we want to set the front to the activity moved to the front
        // of the task.
        boolean foundFront = newTop != null ? true : false;

        final int numActivities = mActivities.size();
        for (int activityNdx = 0; activityNdx < numActivities; ++activityNdx) {
            final ActivityRecord r = mActivities.get(activityNdx);
            if (foundFront || r.finishing) {
                r.frontOfTask = false;
            } else {
                r.frontOfTask = true;
                // Set frontOfTask false for every following activity.
                foundFront = true;
            }
        }
        if (!foundFront && numActivities > 0) {
            // All activities of this task are finishing. As we ought to have a frontOfTask
            // activity, make the bottom activity front.
            mActivities.get(0).frontOfTask = true;
        }
        if (newTop != null) {
            newTop.frontOfTask = true;
        }
    }

    /**
     * Reorder the history stack so that the passed activity is brought to the front.
     */
    final void moveActivityToFrontLocked(ActivityRecord newTop) {
        if (DEBUG_ADD_REMOVE) Slog.i(TAG_ADD_REMOVE,
                "Removing and adding activity " + newTop
                + " to stack at top callers=" + Debug.getCallers(4));

        mActivities.remove(newTop);
        mActivities.add(newTop);
        updateEffectiveIntent();

        setFrontOfTask(newTop);
    }

    void addActivityAtBottom(ActivityRecord r) {
        addActivityAtIndex(0, r);
    }

    void addActivityToTop(ActivityRecord r) {
        addActivityAtIndex(mActivities.size(), r);
    }

    void addActivityAtIndex(int index, ActivityRecord r) {
        // Remove r first, and if it wasn't already in the list and it's fullscreen, count it.
        if (!mActivities.remove(r) && r.fullscreen) {
            // Was not previously in list.
            numFullscreen++;
        }
        // Only set this based on the first activity
        if (mActivities.isEmpty()) {
            taskType = r.mActivityType;
            if (taskType == HOME_ACTIVITY_TYPE && mService.mForceResizableActivities) {
                mResizeable = r.isResizeable();
            }
            isPersistable = r.isPersistable();
            mCallingUid = r.launchedFromUid;
            mCallingPackage = r.launchedFromPackage;
            // Clamp to [1, max].
            maxRecents = Math.min(Math.max(r.info.maxRecents, 1),
                    ActivityManager.getMaxAppRecentsLimitStatic());
        } else {
            // Otherwise make all added activities match this one.
            r.mActivityType = taskType;
        }
        mActivities.add(index, r);
        updateEffectiveIntent();
        if (r.isPersistable()) {
            mService.notifyTaskPersisterLocked(this, false);
        }
    }

    /** @return true if this was the last activity in the task */
    boolean removeActivity(ActivityRecord r) {
        if (mActivities.remove(r) && r.fullscreen) {
            // Was previously in list.
            numFullscreen--;
        }
        if (r.isPersistable()) {
            mService.notifyTaskPersisterLocked(this, false);
        }
        if (mActivities.isEmpty()) {
            return !mReuseTask;
        }
        updateEffectiveIntent();
        return false;
    }

    boolean autoRemoveFromRecents() {
        // We will automatically remove the task either if it has explicitly asked for
        // this, or it is empty and has never contained an activity that got shown to
        // the user.
        return autoRemoveRecents || (mActivities.isEmpty() && !hasBeenVisible);
    }

    /**
     * Completely remove all activities associated with an existing
     * task starting at a specified index.
     */
    final void performClearTaskAtIndexLocked(int activityNdx) {
        int numActivities = mActivities.size();
        for ( ; activityNdx < numActivities; ++activityNdx) {
            final ActivityRecord r = mActivities.get(activityNdx);
            if (r.finishing) {
                continue;
            }
            if (stack == null) {
                // Task was restored from persistent storage.
                r.takeFromHistory();
                mActivities.remove(activityNdx);
                --activityNdx;
                --numActivities;
            } else if (stack.finishActivityLocked(
                    r, Activity.RESULT_CANCELED, null, "clear-task-index", false)) {
                --activityNdx;
                --numActivities;
            }
        }
    }

    /**
     * Completely remove all activities associated with an existing task.
     */
    final void performClearTaskLocked() {
        mReuseTask = true;
        performClearTaskAtIndexLocked(0);
        mReuseTask = false;
    }

    ActivityRecord performClearTaskForReuseLocked(ActivityRecord newR, int launchFlags) {
        mReuseTask = true;
        final ActivityRecord result = performClearTaskLocked(newR, launchFlags);
        mReuseTask = false;
        return result;
    }

    /**
     * Perform clear operation as requested by
     * {@link Intent#FLAG_ACTIVITY_CLEAR_TOP}: search from the top of the
     * stack to the given task, then look for
     * an instance of that activity in the stack and, if found, finish all
     * activities on top of it and return the instance.
     *
     * @param newR Description of the new activity being started.
     * @return Returns the old activity that should be continued to be used,
     * or null if none was found.
     */
    final ActivityRecord performClearTaskLocked(ActivityRecord newR, int launchFlags) {
        int numActivities = mActivities.size();
        for (int activityNdx = numActivities - 1; activityNdx >= 0; --activityNdx) {
            ActivityRecord r = mActivities.get(activityNdx);
            if (r.finishing) {
                continue;
            }
            if (r.realActivity.equals(newR.realActivity)) {
                // Here it is!  Now finish everything in front...
                final ActivityRecord ret = r;

                for (++activityNdx; activityNdx < numActivities; ++activityNdx) {
                    r = mActivities.get(activityNdx);
                    if (r.finishing) {
                        continue;
                    }
                    ActivityOptions opts = r.takeOptionsLocked();
                    if (opts != null) {
                        ret.updateOptionsLocked(opts);
                    }
                    if (stack != null && stack.finishActivityLocked(
                            r, Activity.RESULT_CANCELED, null, "clear-task-stack", false)) {
                        --activityNdx;
                        --numActivities;
                    }
                }

                // Finally, if this is a normal launch mode (that is, not
                // expecting onNewIntent()), then we will finish the current
                // instance of the activity so a new fresh one can be started.
                if (ret.launchMode == ActivityInfo.LAUNCH_MULTIPLE
                        && (launchFlags & Intent.FLAG_ACTIVITY_SINGLE_TOP) == 0) {
                    if (!ret.finishing) {
                        if (stack != null) {
                            stack.finishActivityLocked(
                                    ret, Activity.RESULT_CANCELED, null, "clear-task-top", false);
                        }
                        return null;
                    }
                }

                return ret;
            }
        }

        return null;
    }

    public TaskThumbnail getTaskThumbnailLocked() {
        if (stack != null) {
            final ActivityRecord resumedActivity = stack.mResumedActivity;
            if (resumedActivity != null && resumedActivity.task == this) {
                final Bitmap thumbnail = stack.screenshotActivitiesLocked(resumedActivity);
                setLastThumbnailLocked(thumbnail);
            }
        }
        final TaskThumbnail taskThumbnail = new TaskThumbnail();
        getLastThumbnail(taskThumbnail);
        return taskThumbnail;
    }

    public void removeTaskActivitiesLocked() {
        // Just remove the entire task.
        performClearTaskAtIndexLocked(0);
    }

    String lockTaskAuthToString() {
        switch (mLockTaskAuth) {
            case LOCK_TASK_AUTH_DONT_LOCK: return "LOCK_TASK_AUTH_DONT_LOCK";
            case LOCK_TASK_AUTH_PINNABLE: return "LOCK_TASK_AUTH_PINNABLE";
            case LOCK_TASK_AUTH_LAUNCHABLE: return "LOCK_TASK_AUTH_LAUNCHABLE";
            case LOCK_TASK_AUTH_WHITELISTED: return "LOCK_TASK_AUTH_WHITELISTED";
            case LOCK_TASK_AUTH_LAUNCHABLE_PRIV: return "LOCK_TASK_AUTH_LAUNCHABLE_PRIV";
            default: return "unknown=" + mLockTaskAuth;
        }
    }

    void setLockTaskAuth() {
        if (!mPrivileged &&
                (mLockTaskMode == LOCK_TASK_LAUNCH_MODE_ALWAYS ||
                        mLockTaskMode == LOCK_TASK_LAUNCH_MODE_NEVER)) {
            // Non-priv apps are not allowed to use always or never, fall back to default
            mLockTaskMode = LOCK_TASK_LAUNCH_MODE_DEFAULT;
        }
        switch (mLockTaskMode) {
            case LOCK_TASK_LAUNCH_MODE_DEFAULT:
                mLockTaskAuth = isLockTaskWhitelistedLocked() ?
                    LOCK_TASK_AUTH_WHITELISTED : LOCK_TASK_AUTH_PINNABLE;
                break;

            case LOCK_TASK_LAUNCH_MODE_NEVER:
                mLockTaskAuth = LOCK_TASK_AUTH_DONT_LOCK;
                break;

            case LOCK_TASK_LAUNCH_MODE_ALWAYS:
                mLockTaskAuth = LOCK_TASK_AUTH_LAUNCHABLE_PRIV;
                break;

            case LOCK_TASK_LAUNCH_MODE_IF_WHITELISTED:
                mLockTaskAuth = isLockTaskWhitelistedLocked() ?
                        LOCK_TASK_AUTH_LAUNCHABLE : LOCK_TASK_AUTH_PINNABLE;
                break;
        }
        if (DEBUG_LOCKTASK) Slog.d(TAG_LOCKTASK, "setLockTaskAuth: task=" + this +
                " mLockTaskAuth=" + lockTaskAuthToString());
    }

    boolean isLockTaskWhitelistedLocked() {
        String pkg = (realActivity != null) ? realActivity.getPackageName() : null;
        if (pkg == null) {
            return false;
        }
        String[] packages = mService.mLockTaskPackages.get(userId);
        if (packages == null) {
            return false;
        }
        for (int i = packages.length - 1; i >= 0; --i) {
            if (pkg.equals(packages[i])) {
                return true;
            }
        }
        return false;
    }
    boolean isHomeTask() {
        return taskType == HOME_ACTIVITY_TYPE;
    }

    boolean isApplicationTask() {
        return taskType == APPLICATION_ACTIVITY_TYPE;
    }

    boolean isOverHomeStack() {
        return mTaskToReturnTo == HOME_ACTIVITY_TYPE || mTaskToReturnTo == RECENTS_ACTIVITY_TYPE;
    }

    /**
     * Find the activity in the history stack within the given task.  Returns
     * the index within the history at which it's found, or < 0 if not found.
     */
    final ActivityRecord findActivityInHistoryLocked(ActivityRecord r) {
        final ComponentName realActivity = r.realActivity;
        for (int activityNdx = mActivities.size() - 1; activityNdx >= 0; --activityNdx) {
            ActivityRecord candidate = mActivities.get(activityNdx);
            if (candidate.finishing) {
                continue;
            }
            if (candidate.realActivity.equals(realActivity)) {
                return candidate;
            }
        }
        return null;
    }

    /** Updates the last task description values. */
    void updateTaskDescription() {
        // Traverse upwards looking for any break between main task activities and
        // utility activities.
        int activityNdx;
        final int numActivities = mActivities.size();
        final boolean relinquish = numActivities == 0 ? false :
                (mActivities.get(0).info.flags & ActivityInfo.FLAG_RELINQUISH_TASK_IDENTITY) != 0;
        for (activityNdx = Math.min(numActivities, 1); activityNdx < numActivities;
                ++activityNdx) {
            final ActivityRecord r = mActivities.get(activityNdx);
            if (relinquish && (r.info.flags & ActivityInfo.FLAG_RELINQUISH_TASK_IDENTITY) == 0) {
                // This will be the top activity for determining taskDescription. Pre-inc to
                // overcome initial decrement below.
                ++activityNdx;
                break;
            }
            if (r.intent != null &&
                    (r.intent.getFlags() & Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET) != 0) {
                break;
            }
        }
        if (activityNdx > 0) {
            // Traverse downwards starting below break looking for set label, icon.
            // Note that if there are activities in the task but none of them set the
            // recent activity values, then we do not fall back to the last set
            // values in the TaskRecord.
            String label = null;
            String iconFilename = null;
            int colorPrimary = 0;
            for (--activityNdx; activityNdx >= 0; --activityNdx) {
                final ActivityRecord r = mActivities.get(activityNdx);
                if (r.taskDescription != null) {
                    if (label == null) {
                        label = r.taskDescription.getLabel();
                    }
                    if (iconFilename == null) {
                        iconFilename = r.taskDescription.getIconFilename();
                    }
                    if (colorPrimary == 0) {
                        colorPrimary = r.taskDescription.getPrimaryColor();
                    }
                }
            }
            lastTaskDescription = new TaskDescription(label, colorPrimary, iconFilename);
            // Update the task affiliation color if we are the parent of the group
            if (taskId == mAffiliatedTaskId) {
                mAffiliatedTaskColor = lastTaskDescription.getPrimaryColor();
            }
        }
    }

    int findEffectiveRootIndex() {
        int effectiveNdx = 0;
        final int topActivityNdx = mActivities.size() - 1;
        for (int activityNdx = 0; activityNdx <= topActivityNdx; ++activityNdx) {
            final ActivityRecord r = mActivities.get(activityNdx);
            if (r.finishing) {
                continue;
            }
            effectiveNdx = activityNdx;
            if ((r.info.flags & ActivityInfo.FLAG_RELINQUISH_TASK_IDENTITY) == 0) {
                break;
            }
        }
        return effectiveNdx;
    }

    void updateEffectiveIntent() {
        final int effectiveRootIndex = findEffectiveRootIndex();
        final ActivityRecord r = mActivities.get(effectiveRootIndex);
        setIntent(r);
    }

    void saveToXml(XmlSerializer out) throws IOException, XmlPullParserException {
        if (DEBUG_RECENTS) Slog.i(TAG_RECENTS, "Saving task=" + this);

        out.attribute(null, ATTR_TASKID, String.valueOf(taskId));
        if (realActivity != null) {
            out.attribute(null, ATTR_REALACTIVITY, realActivity.flattenToShortString());
        }
        out.attribute(null, ATTR_REALACTIVITY_SUSPENDED, String.valueOf(realActivitySuspended));
        if (origActivity != null) {
            out.attribute(null, ATTR_ORIGACTIVITY, origActivity.flattenToShortString());
        }
        // Write affinity, and root affinity if it is different from affinity.
        // We use the special string "@" for a null root affinity, so we can identify
        // later whether we were given a root affinity or should just make it the
        // same as the affinity.
        if (affinity != null) {
            out.attribute(null, ATTR_AFFINITY, affinity);
            if (!affinity.equals(rootAffinity)) {
                out.attribute(null, ATTR_ROOT_AFFINITY, rootAffinity != null ? rootAffinity : "@");
            }
        } else if (rootAffinity != null) {
            out.attribute(null, ATTR_ROOT_AFFINITY, rootAffinity != null ? rootAffinity : "@");
        }
        out.attribute(null, ATTR_ROOTHASRESET, String.valueOf(rootWasReset));
        out.attribute(null, ATTR_AUTOREMOVERECENTS, String.valueOf(autoRemoveRecents));
        out.attribute(null, ATTR_ASKEDCOMPATMODE, String.valueOf(askedCompatMode));
        out.attribute(null, ATTR_USERID, String.valueOf(userId));
        out.attribute(null, ATTR_EFFECTIVE_UID, String.valueOf(effectiveUid));
        out.attribute(null, ATTR_TASKTYPE, String.valueOf(taskType));
        out.attribute(null, ATTR_FIRSTACTIVETIME, String.valueOf(firstActiveTime));
        out.attribute(null, ATTR_LASTACTIVETIME, String.valueOf(lastActiveTime));
        out.attribute(null, ATTR_LASTTIMEMOVED, String.valueOf(mLastTimeMoved));
        out.attribute(null, ATTR_NEVERRELINQUISH, String.valueOf(mNeverRelinquishIdentity));
        if (lastDescription != null) {
            out.attribute(null, ATTR_LASTDESCRIPTION, lastDescription.toString());
        }
        if (lastTaskDescription != null) {
            lastTaskDescription.saveToXml(out);
        }
        mLastThumbnailInfo.saveToXml(out);
        out.attribute(null, ATTR_TASK_AFFILIATION_COLOR, String.valueOf(mAffiliatedTaskColor));
        out.attribute(null, ATTR_TASK_AFFILIATION, String.valueOf(mAffiliatedTaskId));
        out.attribute(null, ATTR_PREV_AFFILIATION, String.valueOf(mPrevAffiliateTaskId));
        out.attribute(null, ATTR_NEXT_AFFILIATION, String.valueOf(mNextAffiliateTaskId));
        out.attribute(null, ATTR_CALLING_UID, String.valueOf(mCallingUid));
        out.attribute(null, ATTR_CALLING_PACKAGE, mCallingPackage == null ? "" : mCallingPackage);
        out.attribute(null, ATTR_RESIZEABLE, String.valueOf(mResizeable));
        out.attribute(null, ATTR_PRIVILEGED, String.valueOf(mPrivileged));
        if (mLastNonFullscreenBounds != null) {
            out.attribute(
                    null, ATTR_NON_FULLSCREEN_BOUNDS, mLastNonFullscreenBounds.flattenToString());
        }

        if (affinityIntent != null) {
            out.startTag(null, TAG_AFFINITYINTENT);
            affinityIntent.saveToXml(out);
            out.endTag(null, TAG_AFFINITYINTENT);
        }

        out.startTag(null, TAG_INTENT);
        intent.saveToXml(out);
        out.endTag(null, TAG_INTENT);

        final ArrayList<ActivityRecord> activities = mActivities;
        final int numActivities = activities.size();
        for (int activityNdx = 0; activityNdx < numActivities; ++activityNdx) {
            final ActivityRecord r = activities.get(activityNdx);
            if (r.info.persistableMode == ActivityInfo.PERSIST_ROOT_ONLY || !r.isPersistable() ||
                    ((r.intent.getFlags() & FLAG_ACTIVITY_NEW_DOCUMENT
                            | FLAG_ACTIVITY_RETAIN_IN_RECENTS) == FLAG_ACTIVITY_NEW_DOCUMENT) &&
                            activityNdx > 0) {
                // Stop at first non-persistable or first break in task (CLEAR_WHEN_TASK_RESET).
                break;
            }
            out.startTag(null, TAG_ACTIVITY);
            r.saveToXml(out);
            out.endTag(null, TAG_ACTIVITY);
        }
    }

    static TaskRecord restoreFromXml(XmlPullParser in, ActivityStackSupervisor stackSupervisor)
            throws IOException, XmlPullParserException {
        Intent intent = null;
        Intent affinityIntent = null;
        ArrayList<ActivityRecord> activities = new ArrayList<>();
        ComponentName realActivity = null;
        boolean realActivitySuspended = false;
        ComponentName origActivity = null;
        String affinity = null;
        String rootAffinity = null;
        boolean hasRootAffinity = false;
        boolean rootHasReset = false;
        boolean autoRemoveRecents = false;
        boolean askedCompatMode = false;
        int taskType = ActivityRecord.APPLICATION_ACTIVITY_TYPE;
        int userId = 0;
        int effectiveUid = -1;
        String lastDescription = null;
        long firstActiveTime = -1;
        long lastActiveTime = -1;
        long lastTimeOnTop = 0;
        boolean neverRelinquishIdentity = true;
        int taskId = INVALID_TASK_ID;
        final int outerDepth = in.getDepth();
        TaskDescription taskDescription = new TaskDescription();
        TaskThumbnailInfo thumbnailInfo = new TaskThumbnailInfo();
        int taskAffiliation = INVALID_TASK_ID;
        int taskAffiliationColor = 0;
        int prevTaskId = INVALID_TASK_ID;
        int nextTaskId = INVALID_TASK_ID;
        int callingUid = -1;
        String callingPackage = "";
        boolean resizeable = false;
        boolean privileged = false;
        Rect bounds = null;

        for (int attrNdx = in.getAttributeCount() - 1; attrNdx >= 0; --attrNdx) {
            final String attrName = in.getAttributeName(attrNdx);
            final String attrValue = in.getAttributeValue(attrNdx);
            if (TaskPersister.DEBUG) Slog.d(TaskPersister.TAG, "TaskRecord: attribute name=" +
                    attrName + " value=" + attrValue);
            if (ATTR_TASKID.equals(attrName)) {
                if (taskId == INVALID_TASK_ID) taskId = Integer.valueOf(attrValue);
            } else if (ATTR_REALACTIVITY.equals(attrName)) {
                realActivity = ComponentName.unflattenFromString(attrValue);
            } else if (ATTR_REALACTIVITY_SUSPENDED.equals(attrName)) {
                realActivitySuspended = Boolean.valueOf(attrValue);
            } else if (ATTR_ORIGACTIVITY.equals(attrName)) {
                origActivity = ComponentName.unflattenFromString(attrValue);
            } else if (ATTR_AFFINITY.equals(attrName)) {
                affinity = attrValue;
            } else if (ATTR_ROOT_AFFINITY.equals(attrName)) {
                rootAffinity = attrValue;
                hasRootAffinity = true;
            } else if (ATTR_ROOTHASRESET.equals(attrName)) {
                rootHasReset = Boolean.valueOf(attrValue);
            } else if (ATTR_AUTOREMOVERECENTS.equals(attrName)) {
                autoRemoveRecents = Boolean.valueOf(attrValue);
            } else if (ATTR_ASKEDCOMPATMODE.equals(attrName)) {
                askedCompatMode = Boolean.valueOf(attrValue);
            } else if (ATTR_USERID.equals(attrName)) {
                userId = Integer.valueOf(attrValue);
            } else if (ATTR_EFFECTIVE_UID.equals(attrName)) {
                effectiveUid = Integer.valueOf(attrValue);
            } else if (ATTR_TASKTYPE.equals(attrName)) {
                taskType = Integer.valueOf(attrValue);
            } else if (ATTR_FIRSTACTIVETIME.equals(attrName)) {
                firstActiveTime = Long.valueOf(attrValue);
            } else if (ATTR_LASTACTIVETIME.equals(attrName)) {
                lastActiveTime = Long.valueOf(attrValue);
            } else if (ATTR_LASTDESCRIPTION.equals(attrName)) {
                lastDescription = attrValue;
            } else if (ATTR_LASTTIMEMOVED.equals(attrName)) {
                lastTimeOnTop = Long.valueOf(attrValue);
            } else if (ATTR_NEVERRELINQUISH.equals(attrName)) {
                neverRelinquishIdentity = Boolean.valueOf(attrValue);
            } else if (attrName.startsWith(TaskThumbnailInfo.ATTR_TASK_THUMBNAILINFO_PREFIX)) {
                thumbnailInfo.restoreFromXml(attrName, attrValue);
            } else if (attrName.startsWith(TaskDescription.ATTR_TASKDESCRIPTION_PREFIX)) {
                taskDescription.restoreFromXml(attrName, attrValue);
            } else if (ATTR_TASK_AFFILIATION.equals(attrName)) {
                taskAffiliation = Integer.valueOf(attrValue);
            } else if (ATTR_PREV_AFFILIATION.equals(attrName)) {
                prevTaskId = Integer.valueOf(attrValue);
            } else if (ATTR_NEXT_AFFILIATION.equals(attrName)) {
                nextTaskId = Integer.valueOf(attrValue);
            } else if (ATTR_TASK_AFFILIATION_COLOR.equals(attrName)) {
                taskAffiliationColor = Integer.valueOf(attrValue);
            } else if (ATTR_CALLING_UID.equals(attrName)) {
                callingUid = Integer.valueOf(attrValue);
            } else if (ATTR_CALLING_PACKAGE.equals(attrName)) {
                callingPackage = attrValue;
            } else if (ATTR_RESIZEABLE.equals(attrName)) {
                resizeable = Boolean.valueOf(attrValue);
            } else if (ATTR_PRIVILEGED.equals(attrName)) {
                privileged = Boolean.valueOf(attrValue);
            } else if (ATTR_NON_FULLSCREEN_BOUNDS.equals(attrName)) {
                bounds = Rect.unflattenFromString(attrValue);
            } else {
                Slog.w(TAG, "TaskRecord: Unknown attribute=" + attrName);
            }
        }

        int event;
        while (((event = in.next()) != XmlPullParser.END_DOCUMENT) &&
                (event != XmlPullParser.END_TAG || in.getDepth() >= outerDepth)) {
            if (event == XmlPullParser.START_TAG) {
                final String name = in.getName();
                if (TaskPersister.DEBUG) Slog.d(TaskPersister.TAG, "TaskRecord: START_TAG name=" +
                        name);
                if (TAG_AFFINITYINTENT.equals(name)) {
                    affinityIntent = Intent.restoreFromXml(in);
                } else if (TAG_INTENT.equals(name)) {
                    intent = Intent.restoreFromXml(in);
                } else if (TAG_ACTIVITY.equals(name)) {
                    ActivityRecord activity = ActivityRecord.restoreFromXml(in, stackSupervisor);
                    if (TaskPersister.DEBUG) Slog.d(TaskPersister.TAG, "TaskRecord: activity=" +
                            activity);
                    if (activity != null) {
                        activities.add(activity);
                    }
                } else {
                    Slog.e(TAG, "restoreTask: Unexpected name=" + name);
                    XmlUtils.skipCurrentTag(in);
                }
            }
        }
        if (!hasRootAffinity) {
            rootAffinity = affinity;
        } else if ("@".equals(rootAffinity)) {
            rootAffinity = null;
        }
        if (effectiveUid <= 0) {
            Intent checkIntent = intent != null ? intent : affinityIntent;
            effectiveUid = 0;
            if (checkIntent != null) {
                IPackageManager pm = AppGlobals.getPackageManager();
                try {
                    ApplicationInfo ai = pm.getApplicationInfo(
                            checkIntent.getComponent().getPackageName(),
                            PackageManager.GET_UNINSTALLED_PACKAGES
                                    | PackageManager.GET_DISABLED_COMPONENTS, userId);
                    if (ai != null) {
                        effectiveUid = ai.uid;
                    }
                } catch (RemoteException e) {
                }
            }
            Slog.w(TAG, "Updating task #" + taskId + " for " + checkIntent
                    + ": effectiveUid=" + effectiveUid);
        }

        final TaskRecord task = new TaskRecord(stackSupervisor.mService, taskId, intent,
                affinityIntent, affinity, rootAffinity, realActivity, origActivity, rootHasReset,
                autoRemoveRecents, askedCompatMode, taskType, userId, effectiveUid, lastDescription,
                activities, firstActiveTime, lastActiveTime, lastTimeOnTop, neverRelinquishIdentity,
                taskDescription, thumbnailInfo, taskAffiliation, prevTaskId, nextTaskId,
                taskAffiliationColor, callingUid, callingPackage, resizeable, privileged,
                realActivitySuspended);
        task.updateOverrideConfiguration(bounds);

        for (int activityNdx = activities.size() - 1; activityNdx >=0; --activityNdx) {
            activities.get(activityNdx).task = task;
        }

        if (DEBUG_RECENTS) Slog.d(TAG_RECENTS, "Restored task=" + task);
        return task;
    }

    /**
     * Update task's override configuration based on the bounds.
     * @return Update configuration or null if there is no change.
     */
    Configuration updateOverrideConfiguration(Rect bounds) {
        if (Objects.equals(mBounds, bounds)) {
            return null;
        }
        final Configuration oldConfig = mOverrideConfig;
        final boolean oldFullscreen = mFullscreen;

        mFullscreen = bounds == null;
        if (mFullscreen) {
            if (mBounds != null && StackId.persistTaskBounds(stack.mStackId)) {
                mLastNonFullscreenBounds = mBounds;
            }
            mBounds = null;
            mOverrideConfig = Configuration.EMPTY;
        } else {
            if (mBounds == null) {
                mBounds = new Rect(bounds);
            } else {
                mBounds.set(bounds);
            }
            if (stack == null || StackId.persistTaskBounds(stack.mStackId)) {
                mLastNonFullscreenBounds = mBounds;
            }
            mOverrideConfig = calculateOverrideConfig(mBounds);
        }

        if (mFullscreen != oldFullscreen) {
            reportMultiWindowModeChange();
        }

        return !mOverrideConfig.equals(oldConfig) ? mOverrideConfig : null;
    }

    Configuration calculateOverrideConfig(Rect bounds) {
        final Configuration serviceConfig = mService.mConfiguration;
        final Configuration config = new Configuration(Configuration.EMPTY);
        // TODO(multidisplay): Update Dp to that of display stack is on.
        final float density = serviceConfig.densityDpi * DisplayMetrics.DENSITY_DEFAULT_SCALE;
        config.screenWidthDp =
                Math.min((int)(bounds.width() / density), serviceConfig.screenWidthDp);
        config.screenHeightDp =
                Math.min((int)(bounds.height() / density), serviceConfig.screenHeightDp);
        config.smallestScreenWidthDp =
                Math.min(config.screenWidthDp, config.screenHeightDp);
        config.orientation = (config.screenWidthDp <= config.screenHeightDp)
                ? Configuration.ORIENTATION_PORTRAIT
                : Configuration.ORIENTATION_LANDSCAPE;
        final int sl = Configuration.resetScreenLayout(serviceConfig.screenLayout);
        config.screenLayout = Configuration.reduceScreenLayout(
                sl, config.screenWidthDp, config.screenHeightDp);
        return config;
    }

    /**
     * Using the existing configuration {@param config}, creates a new task override config such
     * that all the fields that are usually set in an override config are set to the ones in
     * {@param config}.
     */
    Configuration extractOverrideConfig(Configuration config) {
        final Configuration extracted = new Configuration(Configuration.EMPTY);
        extracted.screenWidthDp = config.screenWidthDp;
        extracted.screenHeightDp = config.screenHeightDp;
        extracted.smallestScreenWidthDp = config.smallestScreenWidthDp;
        extracted.orientation = config.orientation;
        extracted.screenLayout = config.screenLayout;
        return extracted;
    }

    Rect updateOverrideConfigurationFromLaunchBounds() {
        final Rect bounds = validateBounds(getLaunchBounds());
        updateOverrideConfiguration(bounds);
        return bounds;
    }

    static Rect validateBounds(Rect bounds) {
        if (bounds != null && bounds.isEmpty()) {
            Slog.wtf(TAG, "Received strange task bounds: " + bounds, new Throwable());
            return null;
        }
        return bounds;
    }

    private void reportMultiWindowModeChange() {
        for (int i = mActivities.size() - 1; i >= 0; i--) {
            final ActivityRecord r = mActivities.get(i);
            if (r.app != null && r.app.thread != null) {
                try {
                    // An activity is consider to be in multi-window mode if its task isn't
                    // fullscreen.
                    r.app.thread.scheduleMultiWindowModeChanged(r.appToken, !mFullscreen);
                } catch (Exception e) {
                    Slog.e(TAG, "TaskRecord.reportMultiWindowModeChange: ", e);
                }
            }
        }
    }

    void reportPictureInPictureModeChangeIfNeeded(ActivityStack prevStack) {
        if (prevStack == null || prevStack == stack
                || (prevStack.mStackId != PINNED_STACK_ID && stack.mStackId != PINNED_STACK_ID)) {
            return;
        }

        for (int i = mActivities.size() - 1; i >= 0; i--) {
            final ActivityRecord r = mActivities.get(i);
            if (r.app != null && r.app.thread != null) {
                try {
                    r.app.thread.schedulePictureInPictureModeChanged(
                            r.appToken, stack.mStackId == PINNED_STACK_ID);
                } catch (Exception e) {
                    Slog.e(TAG, "TaskRecord.reportMultiWindowModeChange: ", e);
                }
            }
        }
    }

    /** Updates the task's bounds and override configuration to match what is expected for the
     * input stack. */
    void updateOverrideConfigurationForStack(ActivityStack inStack) {
        if (stack != null && stack == inStack) {
            return;
        }

        if (inStack.mStackId == FREEFORM_WORKSPACE_STACK_ID) {
            if (!mResizeable) {
                throw new IllegalArgumentException("Can not position non-resizeable task="
                        + this + " in stack=" + inStack);
            }
            if (mBounds != null) {
                return;
            }
            if (mLastNonFullscreenBounds != null) {
                updateOverrideConfiguration(mLastNonFullscreenBounds);
            } else {
                inStack.layoutTaskInStack(this, null);
            }
        } else {
            updateOverrideConfiguration(inStack.mBounds);
        }
    }

    /**
     * Returns the correct stack to use based on task type and currently set bounds,
     * regardless of the focused stack and current stack association of the task.
     * The task will be moved (and stack focus changed) later if necessary.
     */
    int getLaunchStackId() {
        if (!isApplicationTask()) {
            return HOME_STACK_ID;
        }
        if (mBounds != null) {
            return FREEFORM_WORKSPACE_STACK_ID;
        }
        return FULLSCREEN_WORKSPACE_STACK_ID;
    }

    /** Returns the bounds that should be used to launch this task. */
    Rect getLaunchBounds() {
        // If we're over lockscreen, forget about stack bounds and use fullscreen.
        if (mService.mLockScreenShown == LOCK_SCREEN_SHOWN) {
            return null;
        }

        if (stack == null) {
            return null;
        }

        final int stackId = stack.mStackId;
        if (stackId == HOME_STACK_ID
                || stackId == FULLSCREEN_WORKSPACE_STACK_ID
                || (stackId == DOCKED_STACK_ID && !mResizeable)) {
            return mResizeable ? stack.mBounds : null;
        } else if (!StackId.persistTaskBounds(stackId)) {
            return stack.mBounds;
        }
        return mLastNonFullscreenBounds;
    }

    boolean canMatchRootAffinity() {
        // We don't allow root affinity matching on the pinned stack as no other task should
        // be launching in it based on affinity.
        return rootAffinity != null && (stack == null || stack.mStackId != PINNED_STACK_ID);
    }

    void dump(PrintWriter pw, String prefix) {
        pw.print(prefix); pw.print("userId="); pw.print(userId);
                pw.print(" effectiveUid="); UserHandle.formatUid(pw, effectiveUid);
                pw.print(" mCallingUid="); UserHandle.formatUid(pw, mCallingUid);
                pw.print(" mCallingPackage="); pw.println(mCallingPackage);
        if (affinity != null || rootAffinity != null) {
            pw.print(prefix); pw.print("affinity="); pw.print(affinity);
            if (affinity == null || !affinity.equals(rootAffinity)) {
                pw.print(" root="); pw.println(rootAffinity);
            } else {
                pw.println();
            }
        }
        if (voiceSession != null || voiceInteractor != null) {
            pw.print(prefix); pw.print("VOICE: session=0x");
            pw.print(Integer.toHexString(System.identityHashCode(voiceSession)));
            pw.print(" interactor=0x");
            pw.println(Integer.toHexString(System.identityHashCode(voiceInteractor)));
        }
        if (intent != null) {
            StringBuilder sb = new StringBuilder(128);
            sb.append(prefix); sb.append("intent={");
            intent.toShortString(sb, false, true, false, true);
            sb.append('}');
            pw.println(sb.toString());
        }
        if (affinityIntent != null) {
            StringBuilder sb = new StringBuilder(128);
            sb.append(prefix); sb.append("affinityIntent={");
            affinityIntent.toShortString(sb, false, true, false, true);
            sb.append('}');
            pw.println(sb.toString());
        }
        if (origActivity != null) {
            pw.print(prefix); pw.print("origActivity=");
            pw.println(origActivity.flattenToShortString());
        }
        if (realActivity != null) {
            pw.print(prefix); pw.print("realActivity=");
            pw.println(realActivity.flattenToShortString());
        }
        if (autoRemoveRecents || isPersistable || taskType != 0 || mTaskToReturnTo != 0
                || numFullscreen != 0) {
            pw.print(prefix); pw.print("autoRemoveRecents="); pw.print(autoRemoveRecents);
                    pw.print(" isPersistable="); pw.print(isPersistable);
                    pw.print(" numFullscreen="); pw.print(numFullscreen);
                    pw.print(" taskType="); pw.print(taskType);
                    pw.print(" mTaskToReturnTo="); pw.println(mTaskToReturnTo);
        }
        if (rootWasReset || mNeverRelinquishIdentity || mReuseTask
                || mLockTaskAuth != LOCK_TASK_AUTH_PINNABLE) {
            pw.print(prefix); pw.print("rootWasReset="); pw.print(rootWasReset);
                    pw.print(" mNeverRelinquishIdentity="); pw.print(mNeverRelinquishIdentity);
                    pw.print(" mReuseTask="); pw.print(mReuseTask);
                    pw.print(" mLockTaskAuth="); pw.println(lockTaskAuthToString());
        }
        if (mAffiliatedTaskId != taskId || mPrevAffiliateTaskId != INVALID_TASK_ID
                || mPrevAffiliate != null || mNextAffiliateTaskId != INVALID_TASK_ID
                || mNextAffiliate != null) {
            pw.print(prefix); pw.print("affiliation="); pw.print(mAffiliatedTaskId);
                    pw.print(" prevAffiliation="); pw.print(mPrevAffiliateTaskId);
                    pw.print(" (");
                    if (mPrevAffiliate == null) {
                        pw.print("null");
                    } else {
                        pw.print(Integer.toHexString(System.identityHashCode(mPrevAffiliate)));
                    }
                    pw.print(") nextAffiliation="); pw.print(mNextAffiliateTaskId);
                    pw.print(" (");
                    if (mNextAffiliate == null) {
                        pw.print("null");
                    } else {
                        pw.print(Integer.toHexString(System.identityHashCode(mNextAffiliate)));
                    }
                    pw.println(")");
        }
        pw.print(prefix); pw.print("Activities="); pw.println(mActivities);
        if (!askedCompatMode || !inRecents || !isAvailable) {
            pw.print(prefix); pw.print("askedCompatMode="); pw.print(askedCompatMode);
                    pw.print(" inRecents="); pw.print(inRecents);
                    pw.print(" isAvailable="); pw.println(isAvailable);
        }
        pw.print(prefix); pw.print("lastThumbnail="); pw.print(mLastThumbnail);
                pw.print(" lastThumbnailFile="); pw.println(mLastThumbnailFile);
        if (lastDescription != null) {
            pw.print(prefix); pw.print("lastDescription="); pw.println(lastDescription);
        }
        if (stack != null) {
            pw.print(prefix); pw.print("stackId="); pw.println(stack.mStackId);
        }
        pw.print(prefix); pw.print("hasBeenVisible="); pw.print(hasBeenVisible);
                pw.print(" mResizeable="); pw.print(mResizeable);
                pw.print(" firstActiveTime="); pw.print(lastActiveTime);
                pw.print(" lastActiveTime="); pw.print(lastActiveTime);
                pw.print(" (inactive for ");
                pw.print((getInactiveDuration()/1000)); pw.println("s)");
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder(128);
        if (stringName != null) {
            sb.append(stringName);
            sb.append(" U=");
            sb.append(userId);
            sb.append(" StackId=");
            sb.append(stack != null ? stack.mStackId : INVALID_STACK_ID);
            sb.append(" sz=");
            sb.append(mActivities.size());
            sb.append('}');
            return sb.toString();
        }
        sb.append("TaskRecord{");
        sb.append(Integer.toHexString(System.identityHashCode(this)));
        sb.append(" #");
        sb.append(taskId);
        if (affinity != null) {
            sb.append(" A=");
            sb.append(affinity);
        } else if (intent != null) {
            sb.append(" I=");
            sb.append(intent.getComponent().flattenToShortString());
        } else if (affinityIntent != null) {
            sb.append(" aI=");
            sb.append(affinityIntent.getComponent().flattenToShortString());
        } else {
            sb.append(" ??");
        }
        stringName = sb.toString();
        return toString();
    }
}