broadcoast发送与接收

AsyncTask.THREAD_POOL_EXECUTOR.execute(new Runnable() {
            @Override
            public void run() {
                Intent intent = new Intent();
                //子线程发出一个带有这个信号的intent
                intent.setAction(Constant.MY_BROADCAST_ACTION);
                intent.putExtra("mydata", "你好");
                sendBroadcast(intent);
            }
        });

ContextWrapper#sendBroadcast()  --> ContextImpl#sendBroadcast()
    然后在ContextImpl的sendBroadcast中调用了ActivityManager.getService().broadcastIntent(...)
    //实际上这个就是AIDL的IActivityManager的一个proxy对象调用的broadcastIntent方法

public final int broadcastIntent(IApplicationThread caller,
            Intent intent, String resolvedType, IIntentReceiver resultTo,
            int resultCode, String resultData, Bundle resultExtras,
            String[] requiredPermissions, int appOp, Bundle bOptions,
            boolean serialized, boolean sticky, int userId) {
        synchronized(this) {
            intent = verifyBroadcastLocked(intent);
            final long origId = Binder.clearCallingIdentity();
            //....
            // 1.
            int res = broadcastIntentLocked(callerApp, callerApp != null ? callerApp.info.packageName : null, intent, resolvedType, resultTo, resultCode, resultData, resultExtras,requiredPermissions, appOp, bOptions, serialized, sticky,callingPid, callingUid, userId);
            Binder.restoreCallingIdentity(origId);
            return res;
        }
    }