BroadcastReceiver工作过程

动态注册过程：

ContextWrapper.registerReceiver-->

ContextImpl.registerReceiver-->

ContextImpl.registerReceiverInternal-->

ActivityManagerNative.getDefault().registerReceiver-->

ActivityManagerService.registerReceiver-->

接着会把远程的InnerReceiver和IntentFilter对象存储起来

发送和接收过程：

ContextWrapper.sendBroadcast-->

ContextImpl.sendBroadcast-->

ActivityManagerNative.getDefault().boradcastIntent-->

ActivityManagerService.broadcastIntent-->

ActivityManagerService.broadcastIntentLocked-->

BroadcastQueue.scheduleBroadcastsLocked-->

BroadcastQueue.processNextBroadcast-->

BroadcastQueue.deliverToRegisteredReceiverLocked-->

BroadcastQueue.performReceiveLocked-->

ApplicationThread.scheduleRegisteredReceiver-->

InnerReceiver.performReceive-->

LoadedApk.ReceiverDispatcher.performReceive-->

ActivityThread.H.post(args)-->

args.run-->

BroadcastReceiver.onReceive

No1：

四大组件都是在应用安装时由PMS（PackageManagerService）解析并注册的。

No2:

从Android3.1开始，处于停止状态的应用同样无法接收到开机广播FLAG_INCLUDE_STOPPED_PACKAGES

而在Android3.1之前，处于停止状态的应用是可以收到开机广播的