android AsyncChannel机制 --- 同步消息分析

3 同步消息分析

发送同步消息以及处理消息结果如下,

Message replyMsg = mClientAsyncChannel.sendMessageSynchronously(MSG_SYNC_REQ);
String msg = (String) replyMsg.obj;

发送同步消息的流程图如下,

AsyncChannel的sendMessageSynchronously方法如下,

public Message sendMessageSynchronously(int what) {
        Message msg = Message.obtain();
        msg.what = what;
        Message resultMsg = sendMessageSynchronously(msg);
        return resultMsg;
    }

封装为Message对象然后调用sendMessageSynchronously方法,如下,

public Message sendMessageSynchronously(Message msg) {
     Message resultMsg = SyncMessenger.sendMessageSynchronously(mDstMess