关于Android中的处理程序的问题

Question

If I've got it right a handler works like a queue. So my simple question is if I first postDelayed and after that do I regular post. Will the second post run after the first delayed post?

handler.postDelayed(someMethod(), 10000);
handler.post(someOtherMethod());

Will the someOtherMethod() run after someMethod()

Answer 1

No it won't. The second one will be performed immediately when all pending handler requests (so on the UI thread) are done. The first will be appended after 10 seconds.

Hint: The handler takes a Runnable , so it looks like that:

handler.post(new Runnable {
    public void run() {
        doSomething();
    }
}

Update based on comment:

The handler invokes the posted runnable on the thread on which new Handler() was called.

Answer 2

否，第二篇文章将尽快（在第一篇之前）运行。

Answer 3

No, handler posts are asynchronous. what handler.post() does it that it adds the runnable to the message queue. handler.postDelayed() adds the runnable to the message queue immediately , but the timer will be set to delayed ms , after which the runnable will be executed.

so all post does is , to add the runnable to the message queue.