Android 7.1 SystemUI--任务管理--场景一:长按某个缩略图，拖动分屏的流程

TaskView 类的长按事件 onLongClick 方法内发送了 DragStartEvent 事件消息，该 DragStartEvent 事件消息由 RecentsView,TaskStackView和 RecentsViewTouchHandler三个类接受处理.

a. TaskStackView

public final void onBusEvent(DragStartEvent event) {
        // Ensure that the drag task is not animated
        addIgnoreTask(event.task);

if (event.task.isFreeformTask()) {
            // Animate to the front of the stack
            mStackScroller.animateScroll(mLayoutAlgorithm.mInitialScrollP, null);
        }
  
        // Enlarge the dragged view slightly   //X轴方向放大view
        float finalScale = event.taskView.getScaleX() * DRAG_SCALE_FACTOR;
        mLayoutAlgorithm.getStackTransform(event.task, getScroller().getStackScroll(),
                mTmpTransform, null);
        mTmpTransform.scale = finalScale;
        mTmpTransform.translationZ = mLayoutAlgorithm.mMaxTranslationZ + 1;
        mTmpTransform.dimAlpha = 0f;
        updateTaskViewToTransform(event.taskView, mTmpTransform,
                new AnimationProps(DRAG_SCALE_DURATION, Interpolators.FAST_OUT_SLOW_IN));
    }

b. RecentsView

public final void onBusEvent(DragStartEvent event) {

// 显示Dock可见区域
        updateVisibleDockRegions(mTouchHandler.getDockStatesForCurrentOrientation(),
                true /* isDefaultDockState */, TaskStack.DockState.NONE.viewState.dockAreaAlpha,
                TaskStack.DockState.NONE.viewState.hintTextAlpha,
                true /* animateAlpha */, false /* animateBounds */);

// Temporarily hide the stack action button without changing visibility
        if (mStackActionButton != null) {
            mStackActionButton.animate()
                    .alpha(0f)
                    .setDuration(HIDE_STACK_ACTION_BUTTON_DURATION)
                    .setInterpolator(Interpolators.ALPHA_OUT)
                    .start();
        }
    }

c.RecentsViewTouchHandler.java

/**
     * Handles dragging touch events
     */
    private void handleTouchEvent(MotionEvent ev) {

// Dock展示虚拟大区域，准备接纳

EventBus.getDefault().send(new DragDropTargetChangedEvent(mDragTask,
                                    currentDropTarget));

}

EventBus.getDefault().send(new DragEndEvent(mDragTask, mTaskView,
                            !cancelled ? mLastDropTarget : null));  //手指拖动结束事件

1. RecentsView.java

/**
 * This view is the the top level layout that contains TaskStacks (which are laid out according
 * to their SpaceNode bounds.
 */
public class RecentsView extends FrameLayout {

    private RecentsViewTouchHandler mTouchHandler;

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return mTouchHandler.onInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        return mTouchHandler.onTouchEvent(ev);
    }

}

2. RecentsViewTouchHandler.java

/**
 * Handles touch events for a RecentsView.
 */
public class RecentsViewTouchHandler {

    /** Touch preprocessing for handling below */
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        handleTouchEvent(ev);
        return mDragRequested;
    }

    /** Handles touch events once we have intercepted them */
    public boolean onTouchEvent(MotionEvent ev) {
        handleTouchEvent(ev);
        return mDragRequested;
    }

   ......

   /**
     * Handles dragging touch events
     */
    private void handleTouchEvent(MotionEvent ev) {
        int action = ev.getActionMasked();
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                mDownPos.set((int) ev.getX(), (int) ev.getY());
                break;
            case MotionEvent.ACTION_MOVE: {
                float evX = ev.getX();
                float evY = ev.getY();
                float x = evX - mTaskViewOffset.x;
                float y = evY - mTaskViewOffset.y;

                if (mDragRequested) {
                    if (!mIsDragging) {
                        mIsDragging = Math.hypot(evX - mDownPos.x, evY - mDownPos.y) > mDragSlop;
                    }
                    if (mIsDragging) {
                        int width = mRv.getMeasuredWidth();
                        int height = mRv.getMeasuredHeight();

                        DropTarget currentDropTarget = null;

                        // Give priority to the current drop target to retain the touch handling
                        if (mLastDropTarget != null) {
                            if (mLastDropTarget.acceptsDrop((int) evX, (int) evY, width, height,
                                    mRv.mSystemInsets, true /* isCurrentTarget */)) {
                                currentDropTarget = mLastDropTarget;
                            }
                        }

                        // Otherwise, find the next target to handle this event
                        if (currentDropTarget == null) {
                            for (DropTarget target : mDropTargets) {
                                if (target.acceptsDrop((int) evX, (int) evY, width, height,
                                        mRv.mSystemInsets, false /* isCurrentTarget */)) {
                                    currentDropTarget = target;
                                    break;
                                }
                            }
                        }
                        if (mLastDropTarget != currentDropTarget) {
                            mLastDropTarget = currentDropTarget;
                            EventBus.getDefault().send(new DragDropTargetChangedEvent(mDragTask,
                                    currentDropTarget));
                        }

                    }

                    mTaskView.setTranslationX(x);
                    mTaskView.setTranslationY(y);
                }
                break;
            }
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL: {
                if (mDragRequested) {
                    boolean cancelled = action == MotionEvent.ACTION_CANCEL;
                    if (cancelled) {
                        EventBus.getDefault().send(new DragDropTargetChangedEvent(mDragTask, null));
                    }
                    EventBus.getDefault().send(new DragEndEvent(mDragTask, mTaskView,
                            !cancelled ? mLastDropTarget : null));
                    break;
                }
            }
        }
    } 

}

3. RecentsView.java

public final void onBusEvent(final DragEndEvent event) {
        // Handle the case where we drop onto a dock region
        if (event.dropTarget instanceof TaskStack.DockState) {
            final TaskStack.DockState dockState = (TaskStack.DockState) event.dropTarget;

            // Hide the dock region
            updateVisibleDockRegions(null, false /* isDefaultDockState */, -1, -1,
                    false /* animateAlpha */, false /* animateBounds */);

            // We translated the view but we need to animate it back from the current layout-space
            // rect to its final layout-space rect
            Utilities.setViewFrameFromTranslation(event.taskView);

            // Dock the task and launch it
            SystemServicesProxy ssp = Recents.getSystemServices();
  　　　　　　// 触发分屏
            if (ssp.startTaskInDockedMode(event.task.key.id, dockState.createMode)) {
                final OnAnimationStartedListener startedListener =
                        new OnAnimationStartedListener() {
                    @Override
                    public void onAnimationStarted() {
                        EventBus.getDefault().send(new DockedFirstAnimationFrameEvent());
                        // Remove the task and don't bother relaying out, as all the tasks will be
                        // relaid out when the stack changes on the multiwindow change event
                        mTaskStackView.getStack().removeTask(event.task, null,
                                true /* fromDockGesture */);
                    }
                };

                final Rect taskRect = getTaskRect(event.taskView);
                IAppTransitionAnimationSpecsFuture future =
                        mTransitionHelper.getAppTransitionFuture(
                                new AnimationSpecComposer() {
                                    @Override
                                    public List<AppTransitionAnimationSpec> composeSpecs() {
                                        return mTransitionHelper.composeDockAnimationSpec(
                                                event.taskView, taskRect);
                                    }
                                });
                ssp.overridePendingAppTransitionMultiThumbFuture(future,
                        mTransitionHelper.wrapStartedListener(startedListener),
                        true /* scaleUp */);

                MetricsLogger.action(mContext, MetricsEvent.ACTION_WINDOW_DOCK_DRAG_DROP,
                        event.task.getTopComponent().flattenToShortString());
            } else {
                EventBus.getDefault().send(new DragEndCancelledEvent(mStack, event.task,
                        event.taskView));
            }
        } else {
            // Animate the overlay alpha back to 0
            updateVisibleDockRegions(null, true /* isDefaultDockState */, -1, -1,
                    true /* animateAlpha */, false /* animateBounds */);
        }

        // Show the stack action button again without changing visibility
        if (mStackActionButton != null) {
            mStackActionButton.animate()
                    .alpha(1f)
                    .setDuration(SHOW_STACK_ACTION_BUTTON_DURATION)
                    .setInterpolator(Interpolators.ALPHA_IN)
                    .start();
        }
    }

4.SystemServicesProxy.java

触发分屏

    /** Docks a task to the side of the screen and starts it. */
    public boolean startTaskInDockedMode(int taskId, int createMode) {
        if (mIam == null) return false;

        try {
            final ActivityOptions options = ActivityOptions.makeBasic();
            options.setDockCreateMode(createMode);
            options.setLaunchStackId(DOCKED_STACK_ID);
            mIam.startActivityFromRecents(taskId, options.toBundle());
            return true;
        } catch (Exception e) {
            Log.e(TAG, "Failed to dock task: " + taskId + " with createMode: " + createMode, e);
        }
        return false;
    }

5.ActivityManagerService.java

    @Override
    public final int startActivityFromRecents(int taskId, Bundle bOptions) {
        // 权限检查
        if (checkCallingPermission(START_TASKS_FROM_RECENTS) != PackageManager.PERMISSION_GRANTED) {
            String msg = "Permission Denial: startActivityFromRecents called without " +
                    START_TASKS_FROM_RECENTS;
            Slog.w(TAG, msg);
            throw new SecurityException(msg);
        }
        final long origId = Binder.clearCallingIdentity(); // 清除id,更换调用身份，升级权限
        try {
            synchronized (this) {
                return mStackSupervisor.startActivityFromRecentsInner(taskId, bOptions);
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

mStackSupervisor 是 ActivityStackSupervisor对象

6.ActivityStackSupervisor.java

final int startActivityFromRecentsInner(int taskId, Bundle bOptions) {
        final TaskRecord task;
        final int callingUid;
        final String callingPackage;
        final Intent intent;
        final int userId;
        final ActivityOptions activityOptions = (bOptions != null)
                ? new ActivityOptions(bOptions) : null;
        final int launchStackId = (activityOptions != null)
                ? activityOptions.getLaunchStackId() : INVALID_STACK_ID;
        if (launchStackId == HOME_STACK_ID) {
            throw new IllegalArgumentException("startActivityFromRecentsInner: Task "
                    + taskId + " can't be launch in the home stack.");
        }

        if (launchStackId == DOCKED_STACK_ID) {
            mWindowManager.setDockedStackCreateState(
                    activityOptions.getDockCreateMode(), null /* initialBounds */);

            // Defer updating the stack in which recents is until the app transition is done, to
            // not run into issues where we still need to draw the task in recents but the
            // docked stack is already created.
            deferUpdateBounds(HOME_STACK_ID);
            mWindowManager.prepareAppTransition(TRANSIT_DOCK_TASK_FROM_RECENTS, false);
        }

        task = anyTaskForIdLocked(taskId, RESTORE_FROM_RECENTS, launchStackId);
        if (task == null) {
            continueUpdateBounds(HOME_STACK_ID);
            mWindowManager.executeAppTransition();
            throw new IllegalArgumentException(
                    "startActivityFromRecentsInner: Task " + taskId + " not found.");
        }

        // Since we don't have an actual source record here, we assume that the currently focused
        // activity was the source.
        final ActivityStack focusedStack = getFocusedStack();
        final ActivityRecord sourceRecord =
                focusedStack != null ? focusedStack.topActivity() : null;

        if (launchStackId != INVALID_STACK_ID) {
            if (task.stack.mStackId != launchStackId) {
                moveTaskToStackLocked(
                        taskId, launchStackId, ON_TOP, FORCE_FOCUS, "startActivityFromRecents",
                        ANIMATE);
            }
        }

   // If the user must confirm credentials (e.g. when first launching a work app and the
        // Work Challenge is present) let startActivityInPackage handle the intercepting.
        if (!mService.mUserController.shouldConfirmCredentials(task.userId)
                && task.getRootActivity() != null) {
            mService.mActivityStarter.sendPowerHintForLaunchStartIfNeeded(true /* forceSend */);
            mActivityMetricsLogger.notifyActivityLaunching();
            mService.moveTaskToFrontLocked(task.taskId, 0, bOptions);
            mActivityMetricsLogger.notifyActivityLaunched(ActivityManager.START_TASK_TO_FRONT,
                    task.getTopActivity());

            // If we are launching the task in the docked stack, put it into resizing mode so
            // the window renders full-screen with the background filling the void. Also only
            // call this at the end to make sure that tasks exists on the window manager side.
            if (launchStackId == DOCKED_STACK_ID) {
                setResizingDuringAnimation(taskId);
            }

            mService.mActivityStarter.postStartActivityUncheckedProcessing(task.getTopActivity(),
                    ActivityManager.START_TASK_TO_FRONT,
                    sourceRecord != null ? sourceRecord.task.stack.mStackId : INVALID_STACK_ID,
                    sourceRecord, task.stack);
            return ActivityManager.START_TASK_TO_FRONT;
        }
        callingUid = task.mCallingUid;
        callingPackage = task.mCallingPackage;
        intent = task.intent;
        intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY);
        userId = task.userId;
        int result = mService.startActivityInPackage(callingUid, callingPackage, intent, null,
                null, null, 0, 0, bOptions, userId, null, task);
        if (launchStackId == DOCKED_STACK_ID) {
            setResizingDuringAnimation(task.taskId);
        }
        return result;
    }

mService.mUserController.shouldConfirmCredentials(task.userId)

延伸：

1. UserController.java  // 拦截应用启动？

    /**
     * Returns whether the given user requires credential entry at this time. This is used to
     * intercept activity launches for work apps when the Work Challenge is present.
     */
    boolean shouldConfirmCredentials(int userId) {
        synchronized (mService) {
            if (mStartedUsers.get(userId) == null) {
                return false;
            }
        }
        if (!mLockPatternUtils.isSeparateProfileChallengeEnabled(userId)) {
            return false;
        }
        final KeyguardManager km = (KeyguardManager) mService.mContext
                .getSystemService(KEYGUARD_SERVICE);
        return km.isDeviceLocked(userId) && km.isDeviceSecure(userId);
    }

延伸：

2.ActivityStarter.java  //应用锁实现？

private ActivityStartInterceptor mInterceptor;

final int startActivityLocked(IApplicationThread caller, Intent intent, Intent ephemeralIntent,
            String resolvedType, ActivityInfo aInfo, ResolveInfo rInfo,
            IVoiceInteractionSession voiceSession, IVoiceInteractor voiceInteractor,
            IBinder resultTo, String resultWho, int requestCode, int callingPid, int callingUid,
            String callingPackage, int realCallingPid, int realCallingUid, int startFlags,
            ActivityOptions options, boolean ignoreTargetSecurity, boolean componentSpecified,
            ActivityRecord[] outActivity, ActivityStackSupervisor.ActivityContainer container,
            TaskRecord inTask) {
        int err = ActivityManager.START_SUCCESS;

        ......

        mInterceptor.setStates(userId, realCallingPid, realCallingUid, startFlags, callingPackage);
        mInterceptor.intercept(intent, rInfo, aInfo, resolvedType, inTask, callingPid, callingUid,
                options);
        intent = mInterceptor.mIntent;
        rInfo = mInterceptor.mRInfo;
        aInfo = mInterceptor.mAInfo;
        resolvedType = mInterceptor.mResolvedType;
        inTask = mInterceptor.mInTask;
        callingPid = mInterceptor.mCallingPid;
        callingUid = mInterceptor.mCallingUid;
        options = mInterceptor.mActivityOptions;
        if (abort) {
            if (resultRecord != null) {
                resultStack.sendActivityResultLocked(-1, resultRecord, resultWho, requestCode,
                        RESULT_CANCELED, null);
            }
            // We pretend to the caller that it was really started, but
            // they will just get a cancel result.
            ActivityOptions.abort(options);
            return START_SUCCESS;
        }

        ......return err;
    }

延伸：

3.ActivityStartInterceptor.java

/**
 * A class that contains activity intercepting logic for {@link ActivityStarter#startActivityLocked}
 * It's initialized
 */
class ActivityStartInterceptor {

    private final ActivityManagerService mService;
    private UserManager mUserManager;
    private final ActivityStackSupervisor mSupervisor;

    /*
     * Per-intent states loaded from ActivityStarter than shouldn't be changed by any
     * interception routines.
     */
    private int mRealCallingPid;
    private int mRealCallingUid;
    private int mUserId;
    private int mStartFlags;
    private String mCallingPackage;

    /*
     * Per-intent states that were load from ActivityStarter and are subject to modifications
     * by the interception routines. After calling {@link #intercept} the caller should assign
     * these values back to {@link ActivityStarter#startActivityLocked}'s local variables.
     */
    Intent mIntent;
    int mCallingPid;
    int mCallingUid;
    ResolveInfo mRInfo;
    ActivityInfo mAInfo;
    String mResolvedType;
    TaskRecord mInTask;
    ActivityOptions mActivityOptions;

    ActivityStartInterceptor(ActivityManagerService service, ActivityStackSupervisor supervisor) {
        mService = service;
        mSupervisor = supervisor;
    }

    void setStates(int userId, int realCallingPid, int realCallingUid, int startFlags,
            String callingPackage) {
        mRealCallingPid = realCallingPid;
        mRealCallingUid = realCallingUid;
        mUserId = userId;
        mStartFlags = startFlags;
        mCallingPackage = callingPackage;
    }

    void intercept(Intent intent, ResolveInfo rInfo, ActivityInfo aInfo, String resolvedType,
            TaskRecord inTask, int callingPid, int callingUid, ActivityOptions activityOptions) {
        mUserManager = UserManager.get(mService.mContext);
        mIntent = intent;
        mCallingPid = callingPid;
        mCallingUid = callingUid;
        mRInfo = rInfo;
        mAInfo = aInfo;
        mResolvedType = resolvedType;
        mInTask = inTask;
        mActivityOptions = activityOptions;
        if (interceptSuspendPackageIfNeed()) {
            // Skip the rest of interceptions as the package is suspended by device admin so
            // no user action can undo this.
            return;
        }
        if (interceptQuietProfileIfNeeded()) {
            // If work profile is turned off, skip the work challenge since the profile can only
            // be unlocked when profile's user is running.
            return;
        }
        interceptWorkProfileChallengeIfNeeded();
    }

    private boolean interceptQuietProfileIfNeeded() {
        // Do not intercept if the user has not turned off the profile
        if (!mUserManager.isQuietModeEnabled(UserHandle.of(mUserId))) {
            return false;
        }
        IIntentSender target = mService.getIntentSenderLocked(
                INTENT_SENDER_ACTIVITY, mCallingPackage, mCallingUid, mUserId, null, null, 0,
                new Intent[] {mIntent}, new String[] {mResolvedType},
                FLAG_CANCEL_CURRENT | FLAG_ONE_SHOT, null);

        mIntent = UnlaunchableAppActivity.createInQuietModeDialogIntent(mUserId,
                new IntentSender(target));
        mCallingPid = mRealCallingPid;
        mCallingUid = mRealCallingUid;
        mResolvedType = null;

        final UserInfo parent = mUserManager.getProfileParent(mUserId);
        mRInfo = mSupervisor.resolveIntent(mIntent, mResolvedType, parent.id);
        mAInfo = mSupervisor.resolveActivity(mIntent, mRInfo, mStartFlags, null /*profilerInfo*/);
        return true;
    }

    private boolean interceptSuspendPackageIfNeed() {
        // Do not intercept if the admin did not suspend the package
        if (mAInfo == null || mAInfo.applicationInfo == null ||
                (mAInfo.applicationInfo.flags & FLAG_SUSPENDED) == 0) {
            return false;
        }
        DevicePolicyManagerInternal devicePolicyManager = LocalServices.getService(
                DevicePolicyManagerInternal.class);
        if (devicePolicyManager == null) {
            return false;
        }
        mIntent = devicePolicyManager.createPackageSuspendedDialogIntent(
                mAInfo.packageName, mUserId);
        mCallingPid = mRealCallingPid;
        mCallingUid = mRealCallingUid;
        mResolvedType = null;

        final UserInfo parent = mUserManager.getProfileParent(mUserId);
        if (parent != null) {
            mRInfo = mSupervisor.resolveIntent(mIntent, mResolvedType, parent.id);
        } else {
            mRInfo = mSupervisor.resolveIntent(mIntent, mResolvedType, mUserId);
        }
        mAInfo = mSupervisor.resolveActivity(mIntent, mRInfo, mStartFlags, null /*profilerInfo*/);
        return true;
    }

    private boolean interceptWorkProfileChallengeIfNeeded() {
        final Intent interceptingIntent = interceptWithConfirmCredentialsIfNeeded(mIntent,
                mResolvedType, mAInfo, mCallingPackage, mUserId);
        if (interceptingIntent == null) {
            return false;
        }
        mIntent = interceptingIntent;
        mCallingPid = mRealCallingPid;
        mCallingUid = mRealCallingUid;
        mResolvedType = null;
        // If we are intercepting and there was a task, convert it into an extra for the
        // ConfirmCredentials intent and unassign it, as otherwise the task will move to
        // front even if ConfirmCredentials is cancelled.
        if (mInTask != null) {
            mIntent.putExtra(EXTRA_TASK_ID, mInTask.taskId);
            mInTask = null;
        }
        if (mActivityOptions == null) {
            mActivityOptions = ActivityOptions.makeBasic();
        }

        ActivityRecord homeActivityRecord = mSupervisor.getHomeActivity();
        if (homeActivityRecord != null && homeActivityRecord.task != null) {
            // Showing credential confirmation activity in home task to avoid stopping multi-windowed
            // mode after showing the full-screen credential confirmation activity.
            mActivityOptions.setLaunchTaskId(homeActivityRecord.task.taskId);
        }

        final UserInfo parent = mUserManager.getProfileParent(mUserId);
        mRInfo = mSupervisor.resolveIntent(mIntent, mResolvedType, parent.id);
        mAInfo = mSupervisor.resolveActivity(mIntent, mRInfo, mStartFlags, null /*profilerInfo*/);
        return true;
    }

    /**
     * Creates an intent to intercept the current activity start with Confirm Credentials if needed.
     *
     * @return The intercepting intent if needed.
     */
    private Intent interceptWithConfirmCredentialsIfNeeded(Intent intent, String resolvedType,
            ActivityInfo aInfo, String callingPackage, int userId) {
        if (!mService.mUserController.shouldConfirmCredentials(userId)) {
            return null;
        }
        // Allow direct boot aware activity to be displayed before the user is unlocked.
        if (aInfo.directBootAware && mService.mUserController.isUserRunningLocked(userId,
                ActivityManager.FLAG_AND_LOCKED)) {
            return null;
        }
        final IIntentSender target = mService.getIntentSenderLocked(
                INTENT_SENDER_ACTIVITY, callingPackage,
                Binder.getCallingUid(), userId, null, null, 0, new Intent[]{ intent },
                new String[]{ resolvedType },
                FLAG_CANCEL_CURRENT | FLAG_ONE_SHOT | FLAG_IMMUTABLE, null);
        final KeyguardManager km = (KeyguardManager) mService.mContext
                .getSystemService(KEYGUARD_SERVICE);
        final Intent newIntent = km.createConfirmDeviceCredentialIntent(null, null, userId);
        if (newIntent == null) {
            return null;
        }
        newIntent.setFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS |
                FLAG_ACTIVITY_TASK_ON_HOME);
        newIntent.putExtra(EXTRA_PACKAGE_NAME, aInfo.packageName);
        newIntent.putExtra(EXTRA_INTENT, new IntentSender(target));
        return newIntent;
    }

}

7.Divider.java  //分屏模式的中间分割栏

/**
 * Controls the docked stack divider.
 */
public class Divider extends SystemUI {

@Override
    public void start() {
        mWindowManager = new DividerWindowManager(mContext);
        update(mContext.getResources().getConfiguration());
        putComponent(Divider.class, this);
        mDockDividerVisibilityListener = new DockDividerVisibilityListener();
        SystemServicesProxy ssp = Recents.getSystemServices();
        ssp.registerDockedStackListener(mDockDividerVisibilityListener);
        mForcedResizableController = new ForcedResizableInfoActivityController(mContext);
    }

}

8.DockedStackDividerController.java

9.DisplayContent.java

DisplayContent(Display display, WindowManagerService service) {
        mDisplay = display;
        mDisplayId = display.getDisplayId();
        display.getDisplayInfo(mDisplayInfo);
        display.getMetrics(mDisplayMetrics);
        isDefaultDisplay = mDisplayId == Display.DEFAULT_DISPLAY;
        mService = service;
        initializeDisplayBaseInfo();
        mDividerControllerLocked = new DockedStackDividerController(service, this);
        mDimLayerController = new DimLayerController(this);
    }