重庆政务服务网_济南做企业网站的公司_爱站数据_网站优化 秦皇岛

API 33
A进程的Activity起点B进程的BActivity

• ProcessA: startActivity
• ProcessA: android.app.ContextImpl#startActivity()
  • ProcessA: mMainThread.getInstrumentation().execStartActivity
• ProcessA: android.app.Instrumentation#execStartActivity()
  • ProcessA: ActivityTaskManager.getService().startActivity
• SystemServer: com.android.server.wm.ActivityTaskManagerService#startActivity
• SystemServer: com.android.server.wm.ActivityTaskManagerService#startActivityAsUser()
  • SystemServer: getActivityStartController().obtainStarter().execute
• SystemServer: ActivityStarter.execute
• SystemServer: com.android.server.wm.ActivityStarter#executeRequest
• SystemServer: com.android.server.wm.ActivityStarter#startActivityUnchecked
• SystemServer: com.android.server.wm.ActivityStarter#startActivityInner
• SystemServer: com.android.server.wm.RootWindowContainer#resumeFocusedTasksTopActivities()
• SystemServer: com.android.server.wm.Task#resumeTopActivityUncheckedLocked()
• SystemServer: com.android.server.wm.Task#resumeTopActivityInnerLocked
• SystemServer: com.android.server.wm.TaskFragment#resumeTopActivity
  • SystemServer: pausing |= startPausing() 开始执行Aactivity的onPause
    • SystemServer: com.android.server.wm.TaskFragment#startPausing()
    • SystemServer: com.android.server.wm.TaskFragment#schedulePauseActivity
    • SystemServer: mAtmService.getLifecycleManager().scheduleTransaction调用到
    • SystemServer: com.android.server.wm.ClientLifecycleManager#scheduleTransaction(ClientTransaction)
    • SystemServer: ClientTransaction.schedule();
    • SystemServer: mClient.scheduleTransaction(this) mClient为IApplicationThread。即A进程的ibinder
    • Process A：ActivityThread.this.scheduleTransaction
    • Process A：ActivityThread的父类 android.app.ClientTransactionHandler#scheduleTransaction
    • Process A：mTransactionExecutor.execute(transaction);最终调用到对应XXXActivityItem的execute方法
    • Process A： android.app.servertransaction.PauseActivityItem#execute
    • Process A：android.app.ActivityThread#handlePauseActivity
    • Process A：android.app.ActivityThread#performPauseActivity()
    • Process A：android.app.ActivityThread#performPauseActivityIfNeeded
    • Process A：mInstrumentation.callActivityOnPause
    • Process A：android.app.Activity#performPause
    • Process A：android.app.Activity.onPause !!!
• SystemServer: mAtmService.startProcessAsync(APP不存在执行创建进程)
• SystemServer: com.android.server.wm.ActivityTaskManagerService#startProcessAsync
• SystemServer: ActivityManagerInternal::startProcess
• SystemServer: AMS.LocalService.startProcess
• SystemServer: com.android.server.am.ActivityManagerService#startProcessLocked
• SystemServer: com.android.server.am.ProcessList#startProcessLocked()
  • SystemServer: Process.ProcessStartResult startResult = startProcess
• SystemServer: com.android.server.am.ProcessList#startProcess
  • SystemServer: startResult = Process.start
• SystemServer: android.os.Process#start
  • SystemServer: ZYGOTE_PROCESS.start
• SystemServer: android.os.ZygoteProcess#start
  • SystemServer: startViaZygote
• SystemServer: android.os.ZygoteProcess#startViaZygote
• SystemServer: android.os.ZygoteProcess#zygoteSendArgsAndGetResult
• SystemServer: android.os.ZygoteProcess#attemptUsapSendArgsAndGetResult
  • SystemServer: usapWriter.flush();//发送消息到zygote进程的socket中
• Zygote: ZygoteInit中一直有个zygoteServer.runSelectLoop在循环等待消息！
• Zygote: com.android.internal.os.ZygoteServer#runSelectLoop
• Zygote: pollReturnValue = Os.poll(pollFDs, pollTimeoutMs);之前一直阻塞，此时有消息了。往下执行
• Zygote: ZygoteConnection connection = peers.get(pollIndex);//pollIndex>0，则代表通过socket接收来自对端的数据，并执行相应操作
• Zygote: final Runnable command = connection.processOneCommand(this);// ！！！进行进程的处理:创建进程
• Zygote: com.android.internal.os.ZygoteConnection#processCommand
  • Zygote: Zygote.forkAndSpecialize
  • Zygote: com.android.internal.os.Zygote#forkAndSpecialize
  • Zygote: nativeForkAndSpecialize//native去fork子进程
  • Zygote: com_android_internal_os_Zygote_nativeForkAndSpecialize > com_android_internal_os_Zygote.cpp
    • Zygote: pid_t pid = ForkCommon(env, false, fds_to_close, fds_to_ignore, true);//真正fork
  • ProcessB: if (pid == 0) handleChildProc
    • ProcessB: com.android.internal.os.ZygoteInit.java #zygoteInit
    • ProcessB: AndroidRuntime.cpp com.android.internal.os.ZygoteInit#nativeZygoteInit
      • ProcessB: gCurRuntime->onZygoteInit();>AndroidRuntime.cpp
      • ProcessB: onZygoteInit>app_main.cpp
      • ProcessB: ProcessState::self openBinder。初始化新进程的binder
    • ProcessB: com.android.internal.os.RuntimeInit#applicationInit
      • ProcessB: 通过findStaticMain返回一个封装了ActivityThread.main方法的runnable
• ProcessB: com.android.internal.os.ZygoteInit#main > caller.run();执行runnable
• ProcessB: 进入到activityThread.main
• ProcessB: thread.attach(false, startSeq);
• ProcessB: mgr.attachApplication(mAppThread, startSeq);//把应用的binder 传给ams
• SystemServer: com.android.server.am.ActivityManagerService#attachApplicationLocked
  • //mProcessesReady这个变量在AMS的 systemReady 中被赋值为true，所以这里的normalMode也为true
    boolean normalMode = mProcessesReady || isAllowedWhileBooting(app.info);
  • SystemServer: thread.bindApplication
    • ProcessB: ActivityThread.bindApplication>sendMsg
    • ProcessB: ActivityThread.handleBindApplication
    • ProcessB: Application app = data.info.makeApplicationInner(data.restrictedBackupMode, null);
    • ProcessB: android.app.LoadedApk#makeApplicationInner()
    • ProcessB: //通过反射创建application,此处第二个参数为null，表示instrumentation为null。
      • ProcessB: android.app.Instrumentation.newApplication()//pathclassloader问题
        • ProcessB: android.app.Application#attach
        • ProcessB: android.content.ContextWrapper.attachBaseContext//app第一个生命周期
        • ProcessB: mLoadedApk = ContextImpl.getImpl(context).mPackageInfo;//设置mLoadApk
      • ProcessB: if (instrumentation != null) {instrumentation.callApplicationOnCreate(app);}
      • ProcessB: // 所以这里不会执行。oncreate方法在ActivityThread里面调用
    • ProcessB: installContentProviders(app, data.providers);//初始化provider
    • ProcessB: mInstrumentation.onCreate(data.instrumentationArgs);//调用onCeate生命周期。//app第二个生命周期
    • ProcessB: //所以provider的oncreate在application的oncreate之前
  • SystemServer: app.makeActive(thread, mProcessStats);//把ProcessB的binder即applicationThread保存下来
  • SystemServer: updateLruProcessLocked(app, false, null);//把ProcessB的ibinder保存到ProcessList中
  • SystemServer: //ams 里有个变量 processList里有个变量变量ArrayList(ams就间接持有了process的binder)
  • SystemServer: //上面说到，这里normalMode为true，去真正启动Activity
  • SystemServer: didSomething = mAtmInternal.attachApplication(app.getWindowProcessController());
    • SystemServer: 调用到com.android.server.wm.ActivityTaskManagerService.LocalService#attachApplication
    • SystemServer: mRootWindowContainer.attachApplication(wpc)
    • SystemServer: mAttachApplicationHelper.process(app);
    • SystemServer: com.android.server.wm.RootWindowContainer#ensureActivitiesVisible()
    • SystemServer: com.android.server.wm.RootWindowContainer#ensureActivitiesVisible()
    • SystemServer: com.android.server.wm.DisplayContent#ensureActivitiesVisible
    • SystemServer: rootTask.ensureActivitiesVisible(starting, configChanges, preserveWindows, notifyClients);
    • SystemServer: com.android.server.wm.Task#ensureActivitiesVisible()
    • SystemServer: task.updateActivityVisibilities(starting, configChanges, preserveWindows, notifyClients);
    • SystemServer: com.android.server.wm.TaskFragment#updateActivityVisibilities
    • SystemServer: mEnsureActivitiesVisibleHelper.process(starting, configChanges, preserveWindows, notifyClients);
    • SystemServer: com.android.server.wm.EnsureActivitiesVisibleHelper#process
    • SystemServer: setActivityVisibilityState(child.asActivityRecord(), starting, resumeTopActivity);
    • SystemServer: makeVisibleAndRestartIfNeeded(mStarting, mConfigChanges, isTop, resumeTopActivity && isTop, r);
    • SystemServer: mTaskFragment.mTaskSupervisor.startSpecificActivity(r, andResume, true /* checkConfig */)//重要函数
    • SystemServer: com.android.server.wm.ActivityTaskSupervisor#startSpecificActivity
    • SystemServer: com.android.server.wm.ActivityTaskSupervisor#realStartActivityLocked
    • SystemServer: clientTransaction.addCallback(LaunchActivityItem.obtain())//这里是LaunchActivityItem！！
    • SystemServer: mService.getLifecycleManager().scheduleTransaction(clientTransaction);
    • SystemServer: transaction.schedule();
    • SystemServer: android.app.servertransaction.ClientTransaction#schedule > mClient.scheduleTransaction(this);
    • ProcessB: android.app.ActivityThread.ApplicationThread#scheduleTransaction
    • ProcessB: ActivityThread.this.scheduleTransaction(transaction);
    • ProcessB: ActivityThread的父类android.app.ClientTransactionHandler执行scheduleTransaction
    • ProcessB: mTransactionExecutor.execute(transaction);
    • ProcessB: android.app.servertransaction.TransactionExecutor#execute
    • ProcessB: executeCallbacks(transaction);
      • ProcessB: final List callbacks = transaction.getCallbacks();
      • ProcessB: final ClientTransactionItem item = callbacks.get(i);
      • ProcessB: item.execute(mTransactionHandler, token, mPendingActions);
      • ProcessB: item为LaunchActivityItem 所以！！执行
      • ProcessB: android.app.servertransaction.LaunchActivityItem#execute
      • ProcessB: client.handleLaunchActivity(r, pendingActions, null /* customIntent */);
      • ProcessB: android.app.ActivityThread#handleLaunchActivity
      • ProcessB: android.app.ActivityThread#performLaunchActivity
      • ProcessB: mInstrumentation.callActivityOnCreate
      • ProcessB: activity.performCreate(icicle, persistentState);
      • ProcessB: android.app.Activity#performCreate()
      • ProcessB: onCreate(icicle);//执行ProcessB Activity的第一个生命周期