if (Looper.myLooper() != Looper.getMainLooper()) {
// If we finish marking off of the main thread, we need to
// actually do it on the main thread to ensure correct ordering.
Handler mainThread = new Handler(Looper.getMainLooper());
mainThread.post(new Runnable() {
@Override
public void run() {
mEventLog.add(tag, threadId);
mEventLog.finish(this.toString());
}
});
return;
}
handler里面持有一个Looper,Looper里面持有一个消息队列MessageQueue
handler首先会把消息Post到它所持有的Looper的消息队列之中，
Looper循环者从消息队列中拿到消息后进行处理
安卓Handler和Looper的假想
原文：http://blog.csdn.net/rnzuozuo/article/details/45920329
