Launcher对RecentView展示TaskView详细分析-android framework车载车机手机系统开发

原创 2023-08-11 16:12:59 1.5k 阅读 AI写同款

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千里马学框架

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Android12 车载开发TaskView实现分屏这里只给出TaskView的代码，相关联的源码，请看源码,如果想要使用TaskView需要自己去编译frameWork的源码，打包一个aar，或者jar出来使用，否则无法直接使用。1.如果分屏的应用如启动两个应用按照权重占比，互相不叠加在一起，点触摸击事件都可响应，例如左边启动QQ了，右边启动的是微信，二者窗口都可操作。TaskView是谷歌整合安卓多任务多窗口下交互重新重构的独立出来的module，本身继承自ServiceView，TaskView的相关概念性的东西参考。//创建的taskview。阅读详情

AI摘要

该文详细阐述了Android系统中TaskView的创建过程，涉及到ViewPool的使用以减少频繁创建，以及如何通过RecentsView.getTaskViewFromPool方法从缓存中获取。调用链始于RecentsModel.getTasks，经过RecentTasksList和RecentsView，直到最终的TaskLoadResult.loadTasksInBackground。此外，还讨论了如何通过sysui和ActivityTaskManager获取RecentTaskInfo，以及TaskThumbnailView设置缩略图的过程。

TaskView创建的堆栈调用：

b站免费视频教程讲解：
https://www.bilibili.com/video/BV1wj411o7A9/
在这里插入图片描述
TaskView的创建调用栈：

实际上这里创建的调用栈是，但是这里明显使用的ViewPool这种方式，主要是为了减少频繁创建的，所以就干脆缓存到ViewPool中，需要用时候再拿出来

什么时候到ViewPool中获取呢？具体获取调用链如下：

07-29 17:50:08.170  1065  1065 I lsm444  : java.lang.Exception
07-29 17:50:08.170  1065  1065 I lsm444  : 	at com.android.quickstep.views.RecentsView.getTaskViewFromPool(RecentsView.java:2085)
07-29 17:50:08.170  1065  1065 I lsm444  : 	at com.android.quickstep.views.RecentsView.applyLoadPlan(RecentsView.java:1443)
07-29 17:50:08.170  1065  1065 I lsm444  : 	at com.android.quickstep.views.RecentsView$$ExternalSyntheticLambda19.accept(Unknown Source:4)
07-29 17:50:08.170  1065  1065 I lsm444  : 	at com.android.quickstep.RecentTasksList.lambda$getTasks$3$com-android-quickstep-RecentTasksList(RecentTasksList.java:132)
07-29 17:50:08.170  1065  1065 I lsm444  : 	at com.android.quickstep.RecentTasksList$$ExternalSyntheticLambda4.run(Unknown Source:6)
07-29 17:50:08.170  1065  1065 I lsm444  : 	at android.os.Handler.handleCallback(Handler.java:942)
07-29 17:50:08.170  1065  1065 I lsm444  : 	at android.os.Handler.dispatchMessage(Handler.java:99)
07-29 17:50:08.170  1065  1065 I lsm444  : 	at android.os.Looper.loopOnce(Looper.java:201)
07-29 17:50:08.170  1065  1065 I lsm444  : 	at android.os.Looper.loop(Looper.java:288)
07-29 17:50:08.170  1065  1065 I lsm444  : 	at android.app.ActivityThread.main(ActivityThread.java:7898)
07-29 17:50:08.170  1065  1065 I lsm444  : 	at java.lang.reflect.Method.invoke(Native Method)
07-29 17:50:08.170  1065  1065 I lsm444  : 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
07-29 17:50:08.170  1065  1065 I lsm444  : 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

上面可以看出主要是通过RecentsView.applyLoadPlan方法，这个其实是从getTasks这个方法里面进行调用的

    public synchronized int getTasks(boolean loadKeysOnly,
            Consumer<ArrayList<GroupTask>> callback) {
      //省略
        UI_HELPER_EXECUTOR.execute(() -> {
            if (!mResultsBg.isValidForRequest(requestLoadId, loadKeysOnly)) {
                mResultsBg = loadTasksInBackground(Integer.MAX_VALUE, requestLoadId, loadKeysOnly);
            }
            TaskLoadResult loadResult = mResultsBg;
            mMainThreadExecutor.execute(() -> {

                if (callback != null) {
                    ArrayList<GroupTask> result = copyOf(mResultsUi);
                    callback.accept(result);//这里进行的调用applyLoadPlan
                }
            });
        });

        return requestLoadId;
    }

那么又是哪里调用到的getTasks这个方法呢？
getTask的调用链如下：


07-29 17:50:08.161  1065  1065 I lsm444  : getTasks 
07-29 17:50:08.161  1065  1065 I lsm444  : java.lang.Exception
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.quickstep.RecentTasksList.getTasks(RecentTasksList.java:119)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.quickstep.RecentsModel.getTasks(RecentsModel.java:102)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.quickstep.views.RecentsView.reloadIfNeeded(RecentsView.java:2103)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.quickstep.views.RecentsView.updateTaskStackListenerState(RecentsView.java:1634)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.quickstep.views.RecentsView.setOverviewStateEnabled(RecentsView.java:1178)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.quickstep.views.LauncherRecentsView.setOverviewStateEnabled(LauncherRecentsView.java:133)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.quickstep.views.LauncherRecentsView.onStateTransitionStart(LauncherRecentsView.java:100)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.quickstep.views.LauncherRecentsView.onStateTransitionStart(LauncherRecentsView.java:49)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.launcher3.statemanager.StateManager.onStateTransitionStart(StateManager.java:353)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.launcher3.statemanager.StateManager.-$$Nest$monStateTransitionStart(Unknown Source:0)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.launcher3.statemanager.StateManager$1.onAnimationStart(StateManager.java:338)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at android.animation.Animator$AnimatorListener.onAnimationStart(Animator.java:584)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at android.animation.AnimatorSet.start(AnimatorSet.java:737)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at android.animation.AnimatorSet.start(AnimatorSet.java:684)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.launcher3.statemanager.StateManager$StartAnimRunnable.run(StateManager.java:503)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at android.os.Handler.handleCallback(Handler.java:942)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at android.os.Handler.dispatchMessage(Handler.java:99)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at android.os.Looper.loopOnce(Looper.java:201)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at android.os.Looper.loop(Looper.java:288)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at android.app.ActivityThread.main(ActivityThread.java:7898)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at java.lang.reflect.Method.invoke(Native Method)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
07-29 17:50:08.161  1065  1065 I lsm444  : 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

TaskInfo相关的数据加载：

  /**
     * Loads and creates a list of all the recent tasks.
     */
    @VisibleForTesting
    TaskLoadResult loadTasksInBackground(int numTasks, int requestId, boolean loadKeysOnly) {
        int currentUserId = Process.myUserHandle().getIdentifier();
        //调用到sysui端的getRecentTasks
        ArrayList<GroupedRecentTaskInfo> rawTasks =
                mSysUiProxy.getRecentTasks(numTasks, currentUserId);
      //省略

        return allTasks;
    }

这里其实会调用的sysui的getRecentTasks进行查询
这里其实是一个跨进程通信：
frameworks/base/libs/WindowManager/Shell/src/com/android/wm/shell/recents/RecentTasksController.java

 private static class IRecentTasksImpl extends IRecentTasks.Stub {
       //省略
        @Override
        public GroupedRecentTaskInfo[] getRecentTasks(int maxNum, int flags, int userId)
//省略
这里核心又调用到了controller的getRecentTasks
            executeRemoteCallWithTaskPermission(mController, "getRecentTasks",
                    (controller) -> out[0] = controller.getRecentTasks(maxNum, flags, userId)
                            .toArray(new GroupedRecentTaskInfo[0]),
                    true /* blocking */);
            return out[0];
        }
    }

@VisibleForTesting
    ArrayList<GroupedRecentTaskInfo> getRecentTasks(int maxNum, int flags, int userId) {
        // Note: the returned task list is from the most-recent to least-recent order
        //调用到了getRawRecentTasks方法
        final List<ActivityManager.RecentTaskInfo> rawList = getRawRecentTasks(maxNum, flags,
                userId);

        //以下操作主要是为了分屏相关的task可以作为一个整体返回，一般把它们搞成一个gouped，有task1和task2
        
        // Pull out the pairs as we iterate back in the list
        ArrayList<GroupedRecentTaskInfo> recentTasks = new ArrayList<>();
        for (int i = 0; i < rawList.size(); i++) {
            final ActivityManager.RecentTaskInfo taskInfo = rawList.get(i);
            if (!rawMapping.contains(taskInfo.taskId)) {
                // If it's not in the mapping, then it was already paired with another task
                continue;
            }

            final int pairedTaskId = mSplitTasks.get(taskInfo.taskId);
            if (pairedTaskId != INVALID_TASK_ID && rawMapping.contains(pairedTaskId)) {
                final ActivityManager.RecentTaskInfo pairedTaskInfo = rawMapping.get(pairedTaskId);
                rawMapping.remove(pairedTaskId);
                recentTasks.add(new GroupedRecentTaskInfo(taskInfo, pairedTaskInfo,
                        mTaskSplitBoundsMap.get(pairedTaskId)));
            } else {
                recentTasks.add(new GroupedRecentTaskInfo(taskInfo));
            }
        }
        return recentTasks;
    }
    
   @VisibleForTesting
    List<ActivityManager.RecentTaskInfo> getRawRecentTasks(int maxNum, int flags, int userId) {
    //本质就是调用到了atms的getRecentTasks方法
        return ActivityTaskManager.getInstance().getRecentTasks(maxNum, flags, userId);
    }

上面获取RecentTask的信息就已经完成，总结一下：
1、桌面调用到sysui获取Task信息，因为sysui中其实有分屏相关的TecentTask信息
2、sysui也是调用到atms进行RecentTask的信息获取

缩略图设置解析：

07-30 00:56:38.758  1059  1059 I lsm444  : setThumbnail task = [id=16 windowingMode=0 user=0 lastActiveTime=18031] null thumbnailData = com.android.systemui.shared.recents.model.ThumbnailData@57b6fdb
07-30 00:56:38.758  1059  1059 I lsm444  : java.lang.Exception
07-30 00:56:38.758  1059  1059 I lsm444  : 	at com.android.quickstep.views.TaskThumbnailView.setThumbnail(TaskThumbnailView.java:150)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at com.android.quickstep.views.TaskThumbnailView.setThumbnail(TaskThumbnailView.java:162)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at com.android.quickstep.views.TaskView.lambda$onTaskListVisibilityChanged$5$com-android-quickstep-views-TaskView(TaskView.java:819)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at com.android.quickstep.views.TaskView$$ExternalSyntheticLambda3.accept(Unknown Source:4)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at com.android.quickstep.TaskThumbnailCache.lambda$updateThumbnailInBackground$1(TaskThumbnailCache.java:147)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at com.android.quickstep.TaskThumbnailCache$$ExternalSyntheticLambda0.accept(Unknown Source:6)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at com.android.quickstep.TaskThumbnailCache$1.handleResult(TaskThumbnailCache.java:173)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at com.android.quickstep.TaskThumbnailCache$1.handleResult(TaskThumbnailCache.java:163)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at com.android.quickstep.util.CancellableTask.lambda$run$0$com-android-quickstep-util-CancellableTask(CancellableTask.java:43)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at com.android.quickstep.util.CancellableTask$$ExternalSyntheticLambda0.run(Unknown Source:4)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at android.os.Handler.handleCallback(Handler.java:942)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at android.os.Handler.dispatchMessage(Handler.java:99)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at android.os.Looper.loopOnce(Looper.java:201)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at android.os.Looper.loop(Looper.java:288)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at android.app.ActivityThread.main(ActivityThread.java:7898)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at java.lang.reflect.Method.invoke(Native Method)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
07-30 00:56:38.758  1059  1059 I lsm444  : 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

设置相关的缩略图由以下代码触发：

  public void onTaskListVisibilityChanged(boolean visible, @TaskDataChanges int changes) {
     
        if (visible) {
            // These calls are no-ops if the data is already loaded, try and load the high
            // resolution thumbnail if the state permits
            RecentsModel model = RecentsModel.INSTANCE.get(getContext());
            TaskThumbnailCache thumbnailCache = model.getThumbnailCache();
            TaskIconCache iconCache = model.getIconCache();

            if (needsUpdate(changes, FLAG_UPDATE_THUMBNAIL)) {
            //这里进行相关加载缩略图加载
                mThumbnailLoadRequest = thumbnailCache.updateThumbnailInBackground(
                        mTask, thumbnail -> {
                        //加载完成后进行回调
                            mSnapshotView.setThumbnail(mTask, thumbnail);
                        });
            }
           //省略
    }

接下来看updateThumbnailInBackground方法：

    public CancellableTask updateThumbnailInBackground(
            Task task, Consumer<ThumbnailData> callback) {
        Preconditions.assertUIThread();
//省略
        return updateThumbnailInBackground(task.key, !mHighResLoadingState.isEnabled(), t -> {
        //加在完成后的回调有
            task.thumbnail = t;
            callback.accept(t);
        });
    }

再来看看updateThumbnailInBackground方法实现：


    private CancellableTask updateThumbnailInBackground(TaskKey key, boolean lowResolution,
            Consumer<ThumbnailData> callback) {
        Preconditions.assertUIThread();

        ThumbnailData cachedThumbnail = mCache.getAndInvalidateIfModified(key);
        if (cachedThumbnail != null &&  cachedThumbnail.thumbnail != null
                && (!cachedThumbnail.reducedResolution || lowResolution)) {
            // Already cached, lets use that thumbnail
            callback.accept(cachedThumbnail);
            return null;
        }

        CancellableTask<ThumbnailData> request = new CancellableTask<ThumbnailData>() {
            @Override
            public ThumbnailData getResultOnBg() {
            //最终其实是通过传递taskId到ams中获取对应的缩略图
                return ActivityManagerWrapper.getInstance().getTaskThumbnail(
                        key.id, lowResolution);
            }

            @Override
            public void handleResult(ThumbnailData result) {
                mCache.put(key, result);
                callback.accept(result);
            }
        };
        mBgExecutor.execute(request);
        return request;
    }