android framework misc

Intent发送与接收

系统（framework）发送Intent，可以发送Intent的API如下：
sendBroadcast
sendOrderedBroadcast
sendBroadcastAsUser

apk注册Intent接收，在系统（framework）发送Intent时将收到filtered Intent，并处理：
private BroadcastReceiver mReceiver = new BroadcastReceiver(){
public void onReceive(final Context context, Intent intent) {