Android Framework源码解析篇~_android framework 源码开发手册

2501_90228903

于 2025-01-16 09:22:26 发布

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文章标签： android

本文链接：https://blog.youkuaiyun.com/2501_90228903/article/details/145173425

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ActivityTaskSupervisor：
ActivityTaskSupervisor.activityIdleInternal>processStoppingAndFinishingActivities>
ActivityRecord.stopPossible{
mAtmService.getLifecycleManager().scheduleTransaction(app.getThread(), appToken,
        StopActivityItem.obtain(configChangeFlags));
}

重点关注ActivityThread.handleXXX方法：

handleReLaunchActivity>

performDestroyActivity>
r.activity.retainNonConfigurationInstances();//保存 viewmodel等信息传递到新Activity

handleLaunchActivity>

unscheduleGcIdler();//取消在后台接受GC的消息
WindowManagerGlobal.initialize();//WMS 初始化
performLaunchActivity>
newActivity//反射创建 activity
makeApplicationif: (mApplication != null)    return mApplication;
activity.attach>
  attachBaseContext
  new PhoneWindow()
  if (theme != 0) {
    activity.  setTheme(theme)  ;
}
  if (r.isPersistable()) {//  区分持久化，调用onCreat  
    mInstrumentation.callActivityOnCreate(activity, r.state, r.persistentState);
} else {
    mInstrumentation.callActivityOnCreate(activity, r.state);
}

handleResumeActivity>

unscheduleGcIdler();
performResumeActivity>
activity.performResume>
  dispatchActivityPreResumed//全局callback 回调
  performStart/performRestart
  mInstrumentation.callActivity  OnResume  (this);
  mFragments.dispatchResume();
  dispatchActivityPostResumed();全局callback 回调
if (r.window == null && !a.mFinished && willBeVisible) >//不考虑 onCreate中setContrentView触发了Window绑定
r.window = r.activity.getWindow();//PhoneWindow
View decor = r.window.getDecorView();
ViewManager wm = a.getWindowManager();//WindowManagerGlobal
wm.addView(decor, l)>//完成 viewRootImpl 与DecorView关联
  Root = new ViewRootImpl()
  root.setView(view:DecorView)>
    requestLayout();//触发第一个粗略布局
Looper.myQueue().addIdleHandler(new Idler())>;//插入一条Idler消息
ac.activityIdle(a.token, a.createdConfig, stopProfiling)>//给所有没有
  ActivityClientController.activityIdle>//ActivityClientController是一个 IBinder
    activityIdleInternal>
      mHandler.removeMessages(      IDLE_TIMEOUT_MSG      , r);
      mHandler.removeMessages(      LAUNCH_TIMEOUT_MSG      );
      processStoppingAndFinishingActivities>
        if (r.isInHistory()) {
    if (        r.finishing        ) {
        // TODO(b/137329632): Wait for idle of the right activity, not just any.
        r.destroyIfPossible(reason);
    } else {
        r.stopIfPossible();>
    }
}