Activity梳理

Activity.startActivity(intent)

Instrumentation.execStartActivity(this, IApplicationThread, IApplicationToken, this, intent, requestCode, options)

ActivityManagerNative.getDefault().startActivity

ActivityManagerService.startActivity

ActivityManagerService.startActivityLocked (创建新的ActivityRecord)

ActivityManagerService.startActivityUncheckedLocked

mActivityStackSupervisor.startActivityLocked

activityStack.startActivityLocked

mActivityStackSupervisor.resumeTopActivitiesLocked

activityStack.resumeTopActivityLocked

activityStack.resumeTopActivityInnerLocked

(首先调用原始Activity的startPausingLocked，即Activity.onStop)

(如果目标Activity已经存在了， next. app. thread. scheduleResumeActivity）

mActivityStackSupervisor.startSpecificActivityLocked

1.如果进程已经启动

mActivityStackSupervisor.realStartActivityLocked

ProcessRecord.thread.scheduleLaunchActivity

2.如果进程没有启动

ActivityManagerService.startProcessLocked

Process.start("android.app.ActivityThread", ...)

ActivityThread.main

new ActivityThread().attach(false)

ActivityManagerService.getDefault().attachApplication(IApplicationThread)

ActivityManagerService.getDefault().attachApplicationLocked

IApplicationThread.bindApplication

mH.sendMessage(H.BIND_APPLICATION, AppBindData)

ActivityThread.handleBindApplication(AppBindData)

ContextImpl appContext = ContextImpl.createAppContext

1. LoadedApk: data.info = getPackageInfoNoCheck(data.appInfo, data.compatInfo);

2. ContextImpl appContext = ContextImpl.createAppContext

3. new Instrumentation().init(instrContext, appContext, ...)

4. Application app = data.info.makeApplication

5. installContentProviders(app, providers);

6. mInstrumentation.callApplicationOnCreate(app);

mActivityStackSupervisor.attachApplicationLocked

mActivityStackSupervisor.realStartActivityLocked

app.thread.scheduleLaunchActivity

mH.sendMessage(H.LAUCH_ACTIVITY, new ActivityClientRecord)

-> ActivityThread.handleLaunchActivity

        ActivityThread.performLaunchActivity

        1.Activity activity = mInstrumentation.newActivity(cl, component, intent)

        2.activity.attach(appContext, this, mInstrumentation, token, application, ...)

        3.mInstrumentation.callActivityOnCreate(activity)

-> ActivityThread.handleResumeActivity

        ActivityThread.performLaunchActivity

               1.ActivityRecordClient.activity.performResume

        Looper.myQueue().addIdleHandler(new Idler());

               1.ActivityManagerNative.getDefault().activityIdle(a.IApplicationToken)

               2.mActivityStackSupervisor.activityIdleInternalLocked

                   最后主要的是mActivityStackSupervisor中维护了一个mStoppingActivities队

                   列，在Activity被pause的时候会添加到里面,

               3.stack.stopActivityLocked(r)

               4.r.app.thread.scheduleStopActivity

以上已经完全分析了Activity的onPause、handleBindApplicationon、Create、onResume、onStop

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Activity.finish

ActivityManagerNative.getDefault().finishActivity()

ActivityManagerService.finishActivity()

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