AMS:startActivity桌面启动应用

Posted 2021-10-14 xhBruce

startActivity桌面启动应用

android11-release

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Launcher点击应用图标

packages/apps/Launcher3/src/com/android/launcher3/touch/ItemClickHandler.java
packages/apps/Launcher3/src/com/android/launcher3/Launcher.java

onClickAppShortcut -> startAppShortcutOrInfoActivity -> launcher.startActivitySafely -> startActivity()最后调用到Activity.java中

Activity.java

frameworks/base/core/java/android/app/Activity.java
frameworks/base/core/java/android/app/Instrumentation.java

startActivity() -> startActivityForResult -> mInstrumentation.execStartActivity -> ActivityTaskManager.getService().startActivity

• mMainThread.getApplicationThread() 获取ApplicationThread成员变量，是一个Binder对象
• ActivityTaskManager.getService() 获取的是Context.ACTIVITY_TASK_SERVICE 即是 ActivityTaskManagerService
• Instrumentation.java用来监控应用程序和系统的交互

ActivityTaskManagerService

frameworks/base/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
frameworks/base/services/core/java/com/android/server/wm/ActivityStartController.java
frameworks/base/services/core/java/com/android/server/wm/ActivityStarter.java

ActivityTaskManager.getService().startActivity -> startActivityAsUser() -> getActivityStartController()........execute() -> executeRequest(mRequest) -> startActivityUnchecked() -> startActivityInner()

• executeRequest(mRequest)这里输出START u日志，一般定制都会加上pid打印
  
• ActivityRecord r,sourceRecord信息
• startActivityInner()该方法有许多参数处理，如setInitialState\\computeLaunchingTaskFlags\\computeSourceStack\\mIntent.setFlags(mLaunchFlags)\\computeLaunchParams
• startActivityInner() 这里wm_create_task、wm_create_activity
  

ActivityStack.java

frameworks/base/services/core/java/com/android/server/wm/RootWindowContainer.java
frameworks/base/services/core/java/com/android/server/wm/ActivityStack.java
frameworks/base/services/core/java/com/android/server/wm/ActivityStackSupervisor.java
frameworks/base/services/core/java/com/android/server/wm/ActivityRecord.java
frameworks/base/services/core/java/com/android/server/wm/Task.java

• mResumedActivity != null时先startPausingLocked() 执行Pausing过程

• next.setState(RESUMED, "resumeTopActivityInnerLocked");设置ActivityRecord的RESUMED状态，最终通过Task调用到ATMS中setResumedActivityUncheckLocked，并输出wm_set_resumed_activity
  

• resumeTopActivityInnerLocked()这里输出wm_resume_activity
  

• 已经启动，执行realStartActivityLocked()；没有启动执行mService.startProcessAsync()

startProcess

frameworks/base/services/core/java/com/android/server/am/ProcessList.java
frameworks/base/core/java/android/os/Process.java
frameworks/base/core/java/android/app/ActivityThread.java

• Process.start为应用创建进程，最后执行到 ActivityThread.main() 方法

待续~~~ 后面还有很长一段路程

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Log关键字：
ActivityTaskManager: START u|ActivityTaskManager: Displayed
wm_create_activity|wm_set_resumed_activity|wm_resume_activity|wm_on_resume_called|wm_activity_launch_time

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