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标题: Android U 多任务启动分屏——团体流程先容 [打印本页]

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作者: 钜形不锈钢水箱    时间: 2025-1-5 05:17
标题: Android U 多任务启动分屏——团体流程先容
序

原生的分屏功能是在多任务中，点击应用图标选择分屏，在选择多任务中的其他应用进行分屏

代码分析思路

进入上分屏代码分析

我们有两种分析方法，一种是通过Split screen文字查找对应的onClick事件跟踪代码流程

另一种是通过，点击进入到上分屏之后，Toast弹出的文字Tap another app to use split screen来分析

推荐使用第二种方式，如果使用第一种从点击事件开始跟踪比较复杂且轻易出错，但是第二种是在操纵竣事的地方才会有这个打印，我们只需找到打印这个Toast的地方加堆栈即可。
这里我们以这里点击进入到分屏后，Toast弹出的文字Tap another app to use split screen来分析，在多任务中点击Split screen的流程。
字符串一样平常都在XML文件中，我们在代码中找下

我们找到toast_split_select_app，看看其有没有在java文件中调用

发现java文件中没有这个string，推测是在XML文件中套娃了

我们找到了split_instructions_view.xml

方法其是在SplitInstructionsView.java中getSplitInstructionsView方法里面添加的，我们在这里添加堆栈打印，就能得到进入上分屏的流程。

1. Launcher:         at com.android.quickstep.views.SplitInstructionsView.getSplitInstructionsView(SplitInstructionsView.java:79)
2. Launcher:         at com.android.quickstep.views.RecentsView.createInitialSplitSelectAnimation(RecentsView.java:3196)
3. Launcher:         at com.android.quickstep.views.RecentsView.createTaskDismissAnimation(RecentsView.java:3493)
4. Launcher:         at com.android.quickstep.views.RecentsView.createSplitSelectInitAnimation(RecentsView.java:4636)
5. Launcher:         at com.android.launcher3.uioverrides.RecentsViewStateController.handleSplitSelectionState(RecentsViewStateController.java:139)
6. Launcher:         at com.android.launcher3.uioverrides.RecentsViewStateController.setStateWithAnimationInternal(RecentsViewStateController.java:109)
7. Launcher:         at com.android.launcher3.uioverrides.BaseRecentsViewStateController.setStateWithAnimation(BaseRecentsViewStateController.java:91)
8. Launcher:         at com.android.launcher3.uioverrides.BaseRecentsViewStateController.setStateWithAnimation(BaseRecentsViewStateController.java:61)
9. Launcher:         at com.android.launcher3.statemanager.StateManager.createAnimationToNewWorkspaceInternal(StateManager.java:350)
10. Launcher:         at com.android.launcher3.statemanager.StateManager.goToStateAnimated(StateManager.java:285)
11. Launcher:         at com.android.launcher3.statemanager.StateManager.goToState(StateManager.java:273)
12. Launcher:         at com.android.launcher3.statemanager.StateManager.goToState(StateManager.java:152)
13. Launcher:         at com.android.launcher3.statemanager.StateManager.goToState(StateManager.java:145)
14. Launcher:         at com.android.quickstep.views.LauncherRecentsView.initiateSplitSelect(LauncherRecentsView.java:210)
15. Launcher:         at com.android.quickstep.views.TaskView.initiateSplitSelect(TaskView.java:1767)
16. Launcher:         at com.android.quickstep.TaskShortcutFactory$SplitSelectSystemShortcut.onClick(TaskShortcutFactory.java:124)
17. Launcher:         at com.android.quickstep.views.TaskMenuView$$ExternalSyntheticLambda3.onClick(Unknown Source:2)
18. Launcher:         at android.view.View.performClick(View.java:7659)
19. Launcher:         at android.view.View.performClickInternal(View.java:7636)
20. Launcher:         at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0)
21. Launcher:         at android.view.View$PerformClick.run(View.java:30156)
22. Launcher:         at android.os.Handler.handleCallback(Handler.java:958)
23. Launcher:         at android.os.Handler.dispatchMessage(Handler.java:99)
24. Launcher:         at android.os.Looper.loopOnce(Looper.java:205)
25. Launcher:         at android.os.Looper.loop(Looper.java:294)
26. Launcher:         at android.app.ActivityThread.main(ActivityThread.java:8177)
27. Launcher:         at java.lang.reflect.Method.invoke(Native Method)
28. Launcher:         at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:552)
29. Launcher:         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:971)

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进入下分屏代码分析

进入下分屏的代码怎样查找呢？
方法一（正向查找）

从现象上看，进入上分屏后，在多任务界面点击任意的Task，然后进入到分屏。因此可以尝试从下面两点进行分析：
1.最近任务界面有对Task的onClick事件进行监听
2.进入分屏时，涉及窗口相关变化，因此桌面进程一定会进行跨进程通信
关于第二点先进行清除，由于当前无法知道，桌面是怎样跨进程通信到体系侧
因此我们需要从第一点进行排查，从第一点中，我们可以得到如下关键词
关键词：桌面进程、Task、onClick、分屏（split screen）
构造一下上述关键词就是，在桌面里面有对Task进行onClick操纵之后会触发分屏（split screen）相关的方法。
在源码根目录下我们可以进入到桌面相关的目录cd packages/apps/Launcher3

运行下令find . -iname "*task*" | xargs grep -irnozP " onClick.*[\s\S]*?split" > codeFind.txt查找相关代码，简朴解释下这个语句：

• find . -iname "*task*"
  暗昧查询Task相关文件
  
• xargs grep -irnozP " onClick.*[\s\S]*?split"
  拼接，使用正则表达式查询包含onClick到split的句子
  grep参数说明： -P: 启用Perl正则表达式模式；-z: 会把整个文本当成一个字符串，允许多行匹配，即使匹配跨越了换行符的行；-o: 只输出匹配的部门；-n:显示行数；-r: 递归查询； -i: 忽略巨细写。
  正则表达式说明： onClick.*[\s\S]*?split， onClick.*：包含以【空格】onClick开头的单词；[\s\S]*?：多行匹配，\s匹配任何空缺字符，包罗空格、制表符、换页符等等，\S匹配任何非空缺字符；split：以split结尾的单词。
  

终极我们输出一个名为codeFind.txt的文件，我们之后需要在这个文件中再次筛选出我们要找的代码。
(目前没有发现别的更高效的方法，如果有别的方法可以在评论区留言)
终极我们找到

代码路径：packages/apps/Launcher3/quickstep/src/com/android/quickstep/views/TaskView.java

1.     private void onClick(View view) {
2.         if (getTask() == null) {
3.             return;
4.         }
5.         if (confirmSecondSplitSelectApp()) {
6.             return;
7.         }
8.         launchTasks();
9.         mActivity.getStatsLogManager().logger().withItemInfo(getItemInfo())
10.                 .log(LAUNCHER_TASK_LAUNCH_TAP);
11.     }

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跟踪confirmSecondSplitSelectApp()并走读后续流程。
方法二（逆向查找）【推荐】

确认下分屏后，会进入到分屏的状态，可以通过分屏的分割线查找相关代码
图层分析

adb shell dumpsys SurfaceFlinger，找到HWC layers，对比分屏与非分屏状态的图层

我们发现多了一个StageCoordinatorSplitDivider，实在就是分屏时的分割线

直接搜索StageCoordinatorSplitDivider，发现其结果为空

也就是说StageCoordinatorSplitDivider是拼接而成的字符串，因此分开搜索StageCoordinator和SplitDivider

发现有StageCoordinator，另有SplitScreenController平分屏相关的java文件，先尝试在StageCoordinator中搜索SplitDivider，我们找到

StageCoordinator.onTaskAppeared方法从定名上看似乎是对Task进行监听的方法，这个方法里面有初始化分割线控件的方法，我们在这个SplitLayout中添加堆栈

运行make SystemUI下令编译文件

1. SplitScreen: SplitLayout
2. SplitScreen: java.lang.Exception
3. SplitScreen:         at com.android.wm.shell.common.split.SplitLayout.<init>(go/retraceme a9a41fad2b076569b5dcce5872086854a2b8f379c7dc07dcce654ce543da67bb:137)
4. SplitScreen:         at com.android.wm.shell.splitscreen.StageCoordinator.onTaskAppeared(go/retraceme a9a41fad2b076569b5dcce5872086854a2b8f379c7dc07dcce654ce543da67bb:1762)
5. SplitScreen:         at com.android.wm.shell.ShellTaskOrganizer.onTaskAppeared(go/retraceme a9a41fad2b076569b5dcce5872086854a2b8f379c7dc07dcce654ce543da67bb:490)
6. SplitScreen:         at com.android.wm.shell.ShellTaskOrganizer.onTaskAppeared(go/retraceme a9a41fad2b076569b5dcce5872086854a2b8f379c7dc07dcce654ce543da67bb:477)
7. SplitScreen:         at android.window.TaskOrganizer$1.lambda$onTaskAppeared$4(TaskOrganizer.java:325)
8. SplitScreen:         at android.window.TaskOrganizer$1.$r8$lambda$Z3SZqVKLE-2zO9NE5htsmlBghFs(Unknown Source:0)
9. SplitScreen:         at android.window.TaskOrganizer$1$$ExternalSyntheticLambda5.run(Unknown Source:6)
10. SplitScreen:         at android.os.Handler.handleCallback(Handler.java:958)
11. SplitScreen:         at android.os.Handler.dispatchMessage(Handler.java:99)
12. SplitScreen:         at android.os.Looper.loopOnce(Looper.java:205)
13. SplitScreen:         at android.os.Looper.loop(Looper.java:294)
14. SplitScreen:         at android.os.HandlerThread.run(HandlerThread.java:67)

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可惜这个堆栈并不是我们想要的结果，从这个堆栈上看，没有发现分屏操纵相关的流程，只是对SplitLayout的初始化。
但是我们在前面的分析过程中，发现了在SystemUI进程中分屏的两个关键类StageCoordinator和SplitScreenController
查找跨进程调用的方式

由于该功能涉及桌面和SystemUI的跨进程通信，因此我们需要在这两个类里面寻找有跨进程通信的aidl。
涉及aidl必定有实在现类，以是我们分别在这两类中搜索stub
StageCoordinator.java发现里面只有一些动画相关调用

而在SplitScreenController中我们找到ISplitScreen.Stub

这里我们同时也确认了SystemUI侧的调用位置，都是通过ISplitScreen的调用进行跨进程通信。
通过搜索ISplitScreen找到在桌面进程里面的调用位置

找到代码：packages/apps/Launcher3/quickstep/src/com/android/quickstep/SystemUiProxy.java
另有一种更为简便的方式
ISplitScreen.aidl文件中搜索任意方法，在桌面进程里面的调用位置
比方 里面的registerSplitScreenListener方法为例

我们同样找到SystemUiProxy.java
ISplitScreen.aidl中里面的方法在SystemUiProxy.java中有实现，因此我们需要看看这些实现的方法在哪调用，从而找到关键方法。
这里我们以ISplitScreen.startTasks方法为例，在SystemUiProxy.java中查找startTasks方法

这里可以添加堆栈进行分屏操纵后查看打印，这个方法也确实是多任务启动分屏的核心方法，一次能找到纯属偶然。
以是我们这里假设这个方法不是调用分屏的核心方法，我们继承查找桌面侧该方法的相关调用

找到packages/apps/Launcher3/quickstep/src/com/android/quickstep/util/SplitSelectStateController.java
此中里面有多处调用，终极我们找到了到处

分别在四个方法中添加堆栈，查找其调用流程，添加方法不再赘述，终极我们得到

1. Launcher:         at com.android.quickstep.util.SplitSelectStateController.launchTasksRefactored(SplitSelectStateController.java:412)
2. Launcher:         at com.android.quickstep.util.SplitSelectStateController.launchTasks(SplitSelectStateController.java:329)
3. Launcher:         at com.android.quickstep.util.SplitSelectStateController.launchSplitTasks(SplitSelectStateController.java:258)
4. Launcher:         at com.android.quickstep.views.RecentsView.lambda$confirmSplitSelect$34(RecentsView.java:4718)
5. Launcher:         at com.android.quickstep.views.RecentsView.$r8$lambda$uSHMT-0i9azkpL6YW9McOOFyjVQ(Unknown Source:0)
6. Launcher:         at com.android.quickstep.views.RecentsView$$ExternalSyntheticLambda26.accept(Unknown Source:4)
7. Launcher:         at com.android.launcher3.anim.AnimatorListeners$EndStateCallbackWrapper.onAnimationEnd(AnimatorListeners.java:80)
8. Launcher:         at android.animation.Animator$AnimatorListener.onAnimationEnd(Animator.java:711)
9. Launcher:         at android.animation.Animator$AnimatorCaller$$ExternalSyntheticLambda1.call(Unknown Source:4)
10. Launcher:         at android.animation.Animator.callOnList(Animator.java:669)
11. Launcher:         at android.animation.Animator.notifyListeners(Animator.java:608)
12. Launcher:         at android.animation.Animator.notifyEndListeners(Animator.java:633)
13. Launcher:         at android.animation.ValueAnimator.endAnimation(ValueAnimator.java:1306)
14. Launcher:         at android.animation.ValueAnimator.doAnimationFrame(ValueAnimator.java:1566)
15. Launcher:         at android.animation.ValueAnimator.pulseAnimationFrame(ValueAnimator.java:1582)
16. Launcher:         at android.animation.AnimatorSet.pulseFrame(AnimatorSet.java:1314)
17. Launcher:         at android.animation.AnimatorSet.handleAnimationEvents(AnimatorSet.java:1297)
18. Launcher:         at android.animation.AnimatorSet.doAnimationFrame(AnimatorSet.java:1197)
19. Launcher:         at android.animation.AnimationHandler.doAnimationFrame(AnimationHandler.java:328)
20. Launcher:         at android.animation.AnimationHandler.-$$Nest$mdoAnimationFrame(Unknown Source:0)
21. Launcher:         at android.animation.AnimationHandler$1.doFrame(AnimationHandler.java:86)
22. Launcher:         at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1337)
23. Launcher:         at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1348)
24. Launcher:         at android.view.Choreographer.doCallbacks(Choreographer.java:952)
25. Launcher:         at android.view.Choreographer.doFrame(Choreographer.java:878)
26. Launcher:         at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1322)
27. Launcher:         at android.os.Handler.handleCallback(Handler.java:958)
28. Launcher:         at android.os.Handler.dispatchMessage(Handler.java:99)
29. Launcher:         at android.os.Looper.loopOnce(Looper.java:205)
30. Launcher:         at android.os.Looper.loop(Looper.java:294)
31. Launcher:         at android.app.ActivityThread.main(ActivityThread.java:8177)
32. Launcher:         at java.lang.reflect.Method.invoke(Native Method)
33. Launcher:         at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:552)
34. Launcher:         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:971)

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此中Launcher: at com.android.quickstep.views.RecentsView.lambda$confirmSplitSelect$34(RecentsView.java:4718)开始lambda表达式，我们找到这里RecentsView.confirmSplitSelect方法的第4718行

只需要继承在RecentsView.confirmSplitSelect方法添加堆栈，我们得到

1. Launcher:         at com.android.quickstep.views.RecentsView.confirmSplitSelect(RecentsView.java:4716)
2. Launcher:         at com.android.quickstep.views.TaskView.confirmSecondSplitSelectApp(TaskView.java:762)
3. Launcher:         at com.android.quickstep.views.TaskView.onClick(TaskView.java:746)
4. Launcher:         at com.android.quickstep.views.TaskView.$r8$lambda$2dErZAYzRAWboZR0vn31kIz_HGY(Unknown Source:0)
5. Launcher:         at com.android.quickstep.views.TaskView$$ExternalSyntheticLambda2.onClick(Unknown Source:2)
6. Launcher:         at android.view.View.performClick(View.java:7659)
7. Launcher:         at android.view.View.performClickInternal(View.java:7636)
8. Launcher:         at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0)
9. Launcher:         at android.view.View$PerformClick.run(View.java:30156)
10. Launcher:         at android.os.Handler.handleCallback(Handler.java:958)
11. Launcher:         at android.os.Handler.dispatchMessage(Handler.java:99)
12. Launcher:         at android.os.Looper.loopOnce(Looper.java:205)
13. Launcher:         at android.os.Looper.loop(Looper.java:294)
14. Launcher:         at android.app.ActivityThread.main(ActivityThread.java:8177)
15. Launcher:         at java.lang.reflect.Method.invoke(Native Method)
16. Launcher:         at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:552)
17. Launcher:         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:971)

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关键在这里Launcher: at com.android.quickstep.views.TaskView.onClick(TaskView.java:746)
我们终于找到点击下分屏调用的onClick方法，自此分屏的触发流程竣事。
这个查找过程中我们也确定了桌面与SystemUI的跨进程通信方式，即通过ISplitScreen.aidl，SystemUI侧的流程查找不再赘述。
分割线布局

补充说明一下，另有一种方式可以更进一步的帮助我们相识其分割线布局，需要一个前置条件，即手机使用userdebug版本
在AndroidStudio中，在菜单栏上选择Tools -> Legacy Layout Inspector出现如下界面

我们选择systemui的进程

在这个进程中找到前面dump的这个分割线window，我们可以得到这样的View树

找的id就可以找到对应的布局，以及其调用所在
终极我们找到布局
frameworks/base/libs/WindowManager/Shell/res/layout/split_divider.xml，
以及调用这个布局的java文件
frameworks/base/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitWindowManager.java
frameworks/base/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/DividerView.java
我们同样可以在这个类里面添加堆栈打印，查看其创建方法，这里不再赘述。
团体流程

层级布局

1. #1 DefaultTaskDisplayArea type=undefined mode=fullscreen override-mode=fullscreen requested-bounds=[0,0][0,0] bounds=[0,0][1440,2960]
2. #1 Task=3 type=standard mode=fullscreen override-mode=fullscreen requested-bounds=[0,0][0,0] bounds=[0,0][1440,2960]
3.   #1 Task=4 type=standard mode=multi-window override-mode=multi-window requested-bounds=[0,1498][1440,2960] bounds=[0,1498][1440,2960]
4.    #0 Task=55 type=standard mode=multi-window override-mode=undefined requested-bounds=[0,0][0,0] bounds=[0,1498][1440,2960]
5.     #0 ActivityRecord{c8a85d8 u0 com.android.dialer/.main.impl.MainActivity t55} type=standard mode=multi-window override-mode=undefined requested-bounds=[0,0][0,0] bounds=[0,1498][1440,2960]
6.      #0 17b29c2 com.android.dialer/com.android.dialer.main.impl.MainActivity type=standard mode=multi-window override-mode=undefined requested-bounds=[0,0][0,0] bounds=[0,1498][1440,2960]
7.   #0 Task=5 type=standard mode=multi-window override-mode=multi-window requested-bounds=[0,0][1440,1463] bounds=[0,0][1440,1463]
8.    #0 Task=61 type=standard mode=multi-window override-mode=undefined requested-bounds=[0,0][0,0] bounds=[0,0][1440,1463]
9.     #0 ActivityRecord{a029103 u0 com.android.messaging/.ui.conversationlist.ConversationListActivity t61} type=standard mode=multi-window override-mode=undefined requested-bounds=[0,0][0,0] bounds=[0,0][1440,1463]
10.      #0 d3dd038 com.android.messaging/com.android.messaging.ui.conversationlist.ConversationListActivity type=standard mode=multi-window override-mode=undefined requested-bounds=[0,0][0,0] bounds=[0,0][1440,1463]

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对应如下树状图

各模块责任与堆栈

Launcher

负责上下分屏task的确定
1.确定分屏上部门，做好相关显示动画，等待选择下分屏

1. Launcher:         at com.android.quickstep.views.RecentsView.createInitialSplitSelectAnimation(RecentsView.java:3196)
2. Launcher:         at com.android.quickstep.views.RecentsView.createTaskDismissAnimation(RecentsView.java:3493)
3. Launcher:         at com.android.quickstep.views.RecentsView.createSplitSelectInitAnimation(RecentsView.java:4636)
4. Launcher:         at com.android.launcher3.uioverrides.RecentsViewStateController.handleSplitSelectionState(RecentsViewStateController.java:139)
5. Launcher:         at com.android.launcher3.uioverrides.RecentsViewStateController.setStateWithAnimationInternal(RecentsViewStateController.java:109)
6. Launcher:         at com.android.launcher3.uioverrides.BaseRecentsViewStateController.setStateWithAnimation(BaseRecentsViewStateController.java:91)
7. Launcher:         at com.android.launcher3.uioverrides.BaseRecentsViewStateController.setStateWithAnimation(BaseRecentsViewStateController.java:61)
8. Launcher:         at com.android.launcher3.statemanager.StateManager.createAnimationToNewWorkspaceInternal(StateManager.java:350)
9. Launcher:         at com.android.launcher3.statemanager.StateManager.goToStateAnimated(StateManager.java:285)
10. Launcher:         at com.android.launcher3.statemanager.StateManager.goToState(StateManager.java:273)
11. Launcher:         at com.android.launcher3.statemanager.StateManager.goToState(StateManager.java:152)
12. Launcher:         at com.android.launcher3.statemanager.StateManager.goToState(StateManager.java:145)
13. Launcher:         at com.android.quickstep.views.LauncherRecentsView.initiateSplitSelect(LauncherRecentsView.java:210)
14. Launcher:         at com.android.quickstep.views.TaskView.initiateSplitSelect(TaskView.java:1767)
15. Launcher:         at com.android.quickstep.TaskShortcutFactory$SplitSelectSystemShortcut.onClick(TaskShortcutFactory.java:124)
16. Launcher:         at com.android.quickstep.views.TaskMenuView$$ExternalSyntheticLambda3.onClick(Unknown Source:2)
17. Launcher:         at android.view.View.performClick(View.java:7659)
18. Launcher:         at android.view.View.performClickInternal(View.java:7636)
19. Launcher:         at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0)
20. Launcher:         at android.view.View$PerformClick.run(View.java:30156)
21. Launcher:         at android.os.Handler.handleCallback(Handler.java:958)
22. Launcher:         at android.os.Handler.dispatchMessage(Handler.java:99)
23. Launcher:         at android.os.Looper.loopOnce(Looper.java:205)
24. Launcher:         at android.os.Looper.loop(Looper.java:294)
25. Launcher:         at android.app.ActivityThread.main(ActivityThread.java:8177)
26. Launcher:         at java.lang.reflect.Method.invoke(Native Method)
27. Launcher:         at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:552)
28. Launcher:         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:971)

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2.确定选择下分屏，播放相关动画，调用SystemUI接口进入到真正分屏

1. Launcher:         at com.android.quickstep.views.RecentsView.confirmSplitSelect(RecentsView.java:4716)
2. Launcher:         at com.android.quickstep.views.TaskView.confirmSecondSplitSelectApp(TaskView.java:762)
3. Launcher:         at com.android.quickstep.views.TaskView.onClick(TaskView.java:746)
4. Launcher:         at com.android.quickstep.views.TaskView.$r8$lambda$2dErZAYzRAWboZR0vn31kIz_HGY(Unknown Source:0)
5. Launcher:         at com.android.quickstep.views.TaskView$$ExternalSyntheticLambda2.onClick(Unknown Source:2)
6. Launcher:         at android.view.View.performClick(View.java:7659)
7. Launcher:         at android.view.View.performClickInternal(View.java:7636)
8. Launcher:         at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0)
9. Launcher:         at android.view.View$PerformClick.run(View.java:30156)
10. Launcher:         at android.os.Handler.handleCallback(Handler.java:958)
11. Launcher:         at android.os.Handler.dispatchMessage(Handler.java:99)
12. Launcher:         at android.os.Looper.loopOnce(Looper.java:205)
13. Launcher:         at android.os.Looper.loop(Looper.java:294)
14. Launcher:         at android.app.ActivityThread.main(ActivityThread.java:8177)
15. Launcher:         at java.lang.reflect.Method.invoke(Native Method)
16. Launcher:         at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:552)
17. Launcher:         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:971)

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1. pendingAnimation.addEndListener(aBoolean -> {
2.             mSplitSelectStateController.launchSplitTasks(
3.                     aBoolean1 -> RecentsView.this.resetFromSplitSelectionState());
4.             InteractionJankMonitorWrapper.end(InteractionJankMonitorWrapper.CUJ_SPLIT_SCREEN_ENTER);
5.         });

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1. Launcher:         at com.android.quickstep.util.SplitSelectStateController.launchTasksRefactored(SplitSelectStateController.java:412)
2. Launcher:         at com.android.quickstep.util.SplitSelectStateController.launchTasks(SplitSelectStateController.java:329)
3. Launcher:         at com.android.quickstep.util.SplitSelectStateController.launchSplitTasks(SplitSelectStateController.java:258)
4. Launcher:         at com.android.quickstep.views.RecentsView.lambda$confirmSplitSelect$34(RecentsView.java:4718)
5. Launcher:         at com.android.quickstep.views.RecentsView.$r8$lambda$uSHMT-0i9azkpL6YW9McOOFyjVQ(Unknown Source:0)
6. Launcher:         at com.android.quickstep.views.RecentsView$$ExternalSyntheticLambda26.accept(Unknown Source:4)
7. Launcher:         at com.android.launcher3.anim.AnimatorListeners$EndStateCallbackWrapper.onAnimationEnd(AnimatorListeners.java:80)
8. Launcher:         at android.animation.Animator$AnimatorListener.onAnimationEnd(Animator.java:711)
9. Launcher:         at android.animation.Animator$AnimatorCaller$$ExternalSyntheticLambda1.call(Unknown Source:4)
10. Launcher:         at android.animation.Animator.callOnList(Animator.java:669)
11. Launcher:         at android.animation.Animator.notifyListeners(Animator.java:608)
12. Launcher:         at android.animation.Animator.notifyEndListeners(Animator.java:633)
13. Launcher:         at android.animation.ValueAnimator.endAnimation(ValueAnimator.java:1306)
14. Launcher:         at android.animation.ValueAnimator.doAnimationFrame(ValueAnimator.java:1566)
15. Launcher:         at android.animation.ValueAnimator.pulseAnimationFrame(ValueAnimator.java:1582)
16. Launcher:         at android.animation.AnimatorSet.pulseFrame(AnimatorSet.java:1314)
17. Launcher:         at android.animation.AnimatorSet.handleAnimationEvents(AnimatorSet.java:1297)
18. Launcher:         at android.animation.AnimatorSet.doAnimationFrame(AnimatorSet.java:1197)
19. Launcher:         at android.animation.AnimationHandler.doAnimationFrame(AnimationHandler.java:328)
20. Launcher:         at android.animation.AnimationHandler.-$$Nest$mdoAnimationFrame(Unknown Source:0)
21. Launcher:         at android.animation.AnimationHandler$1.doFrame(AnimationHandler.java:86)
22. Launcher:         at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1337)
23. Launcher:         at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1348)
24. Launcher:         at android.view.Choreographer.doCallbacks(Choreographer.java:952)
25. Launcher:         at android.view.Choreographer.doFrame(Choreographer.java:878)
26. Launcher:         at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1322)
27. Launcher:         at android.os.Handler.handleCallback(Handler.java:958)
28. Launcher:         at android.os.Handler.dispatchMessage(Handler.java:99)
29. Launcher:         at android.os.Looper.loopOnce(Looper.java:205)
30. Launcher:         at android.os.Looper.loop(Looper.java:294)
31. Launcher:         at android.app.ActivityThread.main(ActivityThread.java:8177)
32. Launcher:         at java.lang.reflect.Method.invoke(Native Method)
33. Launcher:         at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:552)
34. Launcher:         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:971)

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SystemUiProxy调用ISplitScreen.aidl进行跨进程通信到SystemUI进程

SystemUI

负责管理分屏task(task相关的操纵会发送给systemui_server侧处理)，以及分屏分割线的绘制控制。
SplitScreenController实现了ISplitScreen.aidl

1. SplitScreen:         at android.window.WindowOrganizer.startNewTransition(WindowOrganizer.java:94)
2. SplitScreen:         at com.android.wm.shell.transition.Transitions.startTransition(go/retraceme d8ee0e3eecdad3cdc77c111ff5591ebe26372c47d62ba59187c5ecf96366b561:1121)
3. SplitScreen:         at com.android.wm.shell.splitscreen.SplitScreenTransitions.startEnterTransition(go/retraceme d8ee0e3eecdad3cdc77c111ff5591ebe26372c47d62ba59187c5ecf96366b561:345)
4. SplitScreen:         at com.android.wm.shell.splitscreen.StageCoordinator.startWithTask(go/retraceme d8ee0e3eecdad3cdc77c111ff5591ebe26372c47d62ba59187c5ecf96366b561:701)
5. SplitScreen:         at com.android.wm.shell.splitscreen.StageCoordinator.startTasks(go/retraceme d8ee0e3eecdad3cdc77c111ff5591ebe26372c47d62ba59187c5ecf96366b561:623)
6. SplitScreen:         at com.android.wm.shell.splitscreen.SplitScreenController$ISplitScreenImpl.lambda$startTasks$11(go/retraceme d8ee0e3eecdad3cdc77c111ff5591ebe26372c47d62ba59187c5ecf96366b561:1157)
7. SplitScreen:         at com.android.wm.shell.splitscreen.SplitScreenController$ISplitScreenImpl.$r8$lambda$UuHBVv3bzz4CDOdyAqlv4kaRHgY(go/retraceme d8ee0e3eecdad3cdc77c111ff5591ebe26372c47d62ba59187c5ecf96366b561:0)
8. SplitScreen:         at com.android.wm.shell.splitscreen.SplitScreenController$ISplitScreenImpl$$ExternalSyntheticLambda14.accept(go/retraceme d8ee0e3eecdad3cdc77c111ff5591ebe26372c47d62ba59187c5ecf96366b561:0)
9. SplitScreen:         at com.android.wm.shell.common.ExecutorUtils.lambda$executeRemoteCallWithTaskPermission$1(go/retraceme d8ee0e3eecdad3cdc77c111ff5591ebe26372c47d62ba59187c5ecf96366b561:60)
10. SplitScreen:         at com.android.wm.shell.common.ExecutorUtils.$r8$lambda$s8eUOdyrqpqzzyFwAMGxO-MaCg4(go/retraceme d8ee0e3eecdad3cdc77c111ff5591ebe26372c47d62ba59187c5ecf96366b561:0)
11. SplitScreen:         at com.android.wm.shell.common.ExecutorUtils$$ExternalSyntheticLambda1.run(go/retraceme d8ee0e3eecdad3cdc77c111ff5591ebe26372c47d62ba59187c5ecf96366b561:0)
12. SplitScreen:         at android.os.Handler.handleCallback(Handler.java:958)
13. SplitScreen:         at android.os.Handler.dispatchMessage(Handler.java:99)
14. SplitScreen:         at android.os.Looper.loopOnce(Looper.java:205)
15. SplitScreen:         at android.os.Looper.loop(Looper.java:294)
16. SplitScreen:         at android.os.HandlerThread.run(HandlerThread.java:67)

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1.对上分屏的Task进行启动
2.设置好对应的bound到configration中
3.对分屏的RootTask进行排位到最顶部
4.对下分屏的Task进行启动
对Task的操纵均会生存到WindowContainerTransaction对象中，最后通过WindowOrganizer调用IWindowOrganizerController.aidl进行跨进程通信到SystemServer进程进程Task操纵

注：SplitLayout初始化分屏的分割线的布局的流程，从代码上看，如果shell动画开关是打开的，那么该流程在1和2之间实行；反之，则会在4之后，即窗口relayout流程中通过shell动画流程调用。
SystemServer

仅负责systemui通报过来的下令来操纵task

1. WindowOrganizerController:         at com.android.server.wm.WindowOrganizerController.applyTransaction(WindowOrganizerController.java:597)
2. WindowOrganizerController:         at com.android.server.wm.WindowOrganizerController.applyTransaction(WindowOrganizerController.java:484)
3. WindowOrganizerController:         at com.android.server.wm.WindowOrganizerController.applyTransaction(WindowOrganizerController.java:502)
4. WindowOrganizerController:         at com.android.server.wm.WindowOrganizerController.lambda$startTransition$3(WindowOrganizerController.java:314)
5. WindowOrganizerController:         at com.android.server.wm.WindowOrganizerController.$r8$lambda$v_6sOG-rerjgO2wQxXrUcgpnWaU(WindowOrganizerController.java:0)
6. WindowOrganizerController:         at com.android.server.wm.WindowOrganizerController$$ExternalSyntheticLambda3.onCollectStarted(R8$$SyntheticClass:0)
7. WindowOrganizerController:         at com.android.server.wm.TransitionController.startCollectOrQueue(TransitionController.java:1306)
8. WindowOrganizerController:         at com.android.server.wm.WindowOrganizerController.startTransition(WindowOrganizerController.java:310)
9. WindowOrganizerController:         at com.android.server.wm.WindowOrganizerController.startNewTransition(WindowOrganizerController.java:271)
10. WindowOrganizerController:         at android.window.IWindowOrganizerController$Stub.onTransact(IWindowOrganizerController.java:245)
11. WindowOrganizerController:         at com.android.server.wm.WindowOrganizerController.onTransact(WindowOrganizerController.java:188)
12. WindowOrganizerController:         at android.os.Binder.execTransactInternal(Binder.java:1344)
13. WindowOrganizerController:         at android.os.Binder.execTransact(Binder.java:1275)

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WindowOrganizerController实现了IWindowOrganizerController.aidl
其接收SystemUI中的下令来对Task进行不同的操纵
applyTransaction中对Task地域巨细bounds变化以及RootTask的reorder和startTask等操纵进行了处理
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