1、mIntentSenderRecords
是一个PendingIntentRecord哈希表。一个PendingIntentRecord对象对应的是应用层的一个PendingIntent对象(延迟性的intent)，其中包含send系列方法，主要用于触发PendingIntent的Intent行为。上层应用每获取一个PendingIntent对象时在AMS这边便会生成对应的PendingIntentRecord对象，并保存在mIntentSenderRecords哈希列表中，当上层应用调用PendingIntent.send()时，最终会调用到PendingIntentRecord.sendInner()函数，这个函数会将之前上层应用传下来的Intent进行触发（起Activity、发广播、起service）。PendingIntent对象是可以传递给其他应用的，这个应该才是设计初衷？
2、mRegisteredReceivers
是一个ReceiverList哈希表。ReceiverList对应一个广播接收器，mRegisteredReceivers保存着系统中的所有广播接收器。ReceiverList继承于ArrayList<BroadcastFilter>，实质上就是一个BroadcastFilter列表，源码是这样解释ReceiverList的：
/** * A receiver object that has registered for one or more broadcasts. * The ArrayList holds BroadcastFilter objects. */
熟悉广播接收器的都知道，一个广播接收器可以有多个IntentFilter过滤器，每个过滤器可以通过addAction添加多个action。
public Intent registerReceiver(IApplicationThread caller, String callerPackage,
IIntentReceiver receiver, IntentFilter filter, String permission, int userId) {
...........
ReceiverList rl = (ReceiverList)mRegisteredReceivers.get(receiver.asBinder());
if (rl == null) {
rl = new ReceiverList(this, callerApp, callingPid, callingUid,
userId, receiver);
if (rl.app != null) {
rl.app.receivers.add(rl);
} else {
try {
receiver.asBinder().linkToDeath(rl, 0);
} catch (RemoteException e) {
return sticky;
}
rl.linkedToDeath = true;
}
mRegisteredReceivers.put(receiver.asBinder(), rl);
}
.............
BroadcastFilter bf = new BroadcastFilter(filter, rl, callerPackage,
permission, callingUid, userId);
rl.add(bf);
mReceiverResolver.addFilter(bf);
if (allSticky != null) {
ArrayList receivers = new ArrayList();
receivers.add(bf);
int N = allSticky.size();
for (int i=0; i<N; i++) {
Intent intent = (Intent)allSticky.get(i);
BroadcastQueue queue = broadcastQueueForIntent(intent);
BroadcastRecord r = new BroadcastRecord(queue, intent, null,
null, -1, -1, null, null, AppOpsManager.OP_NONE, receivers, null, 0,
null, null, false, true, true, -1);
queue.enqueueParallelBroadcastLocked(r);
queue.scheduleBroadcastsLocked();
}
}
return sticky;
}
}
上面的代码可以看出一个广播接收器在AMS这边对应有一个ReceiverList，其实是一个BroadcastFilter列表，属于这个广播接受器的IntentFilter对应的BroadcastFilter对象保存在ReceiverList列表中。IntentFilter中的每个action，都会生成一个Intent，每个Intent又会对应new一个BroadcastRecord，然后根据这个Intent是否设置Intent.FLAG_RECEIVER_FOREGROUND来选择一个BroadcastQueue队列来将这个BroadcastRecord加入到队列中。有两个BroadcastQueue队列，分别是mFgBroadcastQueue和mBgBroadcastQueue。