靜態註冊的廣播是有PMS完成註冊的，不在AMS系列中討論，只看動態註冊。
一、註冊廣播代碼流程
ContextWrapper.java
registerReceiver()；Activity.java調用的是爺爺類ContextWrapper.java的registerReceiver()
ContextImpl.java
registerReceiver() → registerReceiverInternal(ActivityManager.getService().registerReceiver())
ActivityManagerService.java
registerReceiver()
備註：
1、ContextImpl.registerReceiverInternal()中用mPackageInfo.getReceiverDispatcher獲取了IIntentReceiver，IIntentReceiver是Binder接口，是LoadedApk.ReceiverDispatcher.InnerReceiver，看着和Service的有點像，原理是類似的。這玩樣兒用於進程間通訊的，所以不用BroadcastReceiver而使用IIntentReceiver。
2、ActivityManagerService.registerReceiver()主要工作：
2.1、存儲遠程的IIntentReceiver對象：mRegisteredReceivers.put(receiver.asBinder(), rl)；
2.2、存儲IntentFilter對象：BroadcastFilter bf = new BroadcastFilter(filter, rl, callerPackage, permission, callingUid, userId, instantApp, visibleToInstantApps);mReceiverResolver.addFilter(bf);
3、每一個應用都持有一個LoadedApk實例，LoadedApk實例中包含多個Context實例，每個Context實例可能創建了多個BroadcastReceiver實例，每個BroadcastReceiver實例在動態註冊的時候都會生成一個對應的ReceiverDispatcher實例，每個ReceiverDispatcher實例內部又會由InnerReceiver類生成一個IIntentReceiver實例。這個IIntentReceiver實例在動態註冊BroadcastReceiver的時候會被傳遞給AMS，AMS會爲每個IIntentReceiver實例創建一個ReceiverList實例，每個ReceiverList實例中保存了多個BroadcastFilter實例，而這個BroadcastFilter實例裏面包含了具體的IntentFilter和ReceiverList等相關信息。
二、廣播的收發代碼流程
ContextWrapper.java
sendBroadcast()；Activity.java調用的是爺爺類ContextWrapper.java的sendBroadcast()
ContextImpl.java
sendBroadcast(ActivityManager.getService().broadcastIntent())
ActivityManagerService.java
broadcastIntent() → broadcastIntentLocked(queue.scheduleBroadcastsLocked())
BroadcastQueue.java
scheduleBroadcastsLocked(mHandler.sendMessage(mHandler.obtainMessage(BROADCAST_INTENT_MSG, this))) → BroadcastHandler.handleMessage(case BROADCAST_INTENT_MSG) → processNextBroadcast() → processNextBroadcastLocked() → deliverToRegisteredReceiverLocked() → performReceiveLocked(app.thread.scheduleRegisteredReceiver())
ActivityThread.java
ApplicationThread.scheduleRegisteredReceiver(receiver.performReceive())
LoadedApk.java
ReceiverDispatcher.performReceive(mActivityThread.post(args.getRunnable())) → Args.getRunnable()
BroadcastReceiver.java
onReceive()
備註：
1、ActivityManagerService.broadcastIntentLocked()剛開始地方有：intent.addFlags(Intent.FLAG_EXCLUDE_STOPPED_PACKAGES);代碼也有註釋，默認情況下廣播不會發送給已經停止的應用，如果想發給已經停止的應用，可以加上Intent.FLAG_INCLUDE_STOPPED_PACKAGES的flag。
2、ActivityManagerService.broadcastIntentLocked()賊長，主要是根據Filter查找滿足條件的接受者並添加到BroadcastQueue中。
2.1、receivers = collectReceiverComponents(intent, resolvedType, callingUid, users);靜態註冊廣播接收者
2.2、registeredReceivers = mReceiverResolver.queryIntent(intent, resolvedType, false, userId);動態註冊的廣播接收者
2.3、receivers.add(registeredReceivers.get(ir));動態註冊的registeredReceivers，全部合併到receivers賦值給BroadcastRecord，再統一按串行方式處理：queue.enqueueOrderedBroadcastLocked(r);queue.scheduleBroadcastsLocked();
3、BroadcastQueue.processNextBroadcastLocked()賊長，這裏只主要看下//First, deliver any non-serialized broadcasts right away.無需廣播處理，走了一波deliverToRegisteredReceiverLocked()。
4、Args.getRunnable()主要代碼有：final BroadcastReceiver receiver = mReceiver;receiver.setPendingResult(this);receiver.onReceive(mContext, intent);這裏onReceive已經被執行了，因爲是mActivityThread.post執行的，所以是在主線程執行的。
三、關係圖
備註：
1、動態註冊過程可理解爲建立LoadedApk、Context、BroadcastReceiver和ReceiverDispatcher的映射關係；建立ReceiverList和BroadcastFilter的映射關係。兩個映射關係共同持有同一個IIntentReceiver。
2、廣播的收發AMS根據Context廣播的Intent信息對照映射關係表從BroadcastFilter開始，反向一層一層找到與之對應的BroadcastReceiver，最終完成BroadcastReceiver.OnReceive的調用，把Intent傳遞給對應的BroadcastReceiver。