贴出安卓N版本ARTSPConnection::sendRequest原文：
==> void ARTSPConnection::sendRequest( const char *request, const sp<AMessage> &reply) { //新建消息msg，消息名为kWhatSendRequest，消息的处理者为this，也即ARTSPConnection //将要发送的消息添加到"request"字段 //将应答异步处理消息的引用添加到"reply"字段 sp<AMessage> msg = new AMessage(kWhatSendRequest, this); msg->setString("request", request); msg->setMessage("reply", reply); msg->post(); } ==> void ARTSPConnection::onMessageReceived(const sp<AMessage> &msg) { switch (msg->what()) { case kWhatConnect: onConnect(msg); break; case kWhatDisconnect: onDisconnect(msg); break; case kWhatCompleteConnection: onCompleteConnection(msg); break; case kWhatSendRequest: //对消息名为kWhatSendRequest的处理 //调用onSendRequest(msg)完成处理的细节 //onSendRequest下一文介绍 onSendRequest(msg); break; case kWhatReceiveResponse: onReceiveResponse(); break; case kWhatObserveBinaryData: { CHECK(msg->findMessage("reply", &mObserveBinaryMessage)); break; } default: TRESPASS(); break; } }