post方法究竟做了什么？ - What exactly does the post method do?

问题：

I've encountered a very weird feature. 我遇到了一个非常奇怪的功能。

When I'm trying to run an animation on the main thread, it does not start. 当我试图在主线程上运行动画时，它不会启动。 When I run said animation using 当我使用运行所述动画

getView().post(new Runnable() {
            @Override
            public void run() {
                getView().startAnimation(a);
            }
        });

It does start. 它确实开始了。

I've printed the CurrentThread before starting the animation and both print main . 我在开始动画之前打印了CurrentThread并且都打印了main 。

Obviously, I am missing something here, as both should start the animation on the main thread... My guess is that as post adds the task to the queue, it starts at a more "correct time", but I would love to know what happens here at more depth. 显然，我在这里遗漏了一些东西，因为两者都应该在主线程上启动动画......我的猜测是，当post将任务添加到队列中时，它会在更“正确的时间”开始，但我很想知道这里发生的事情更深入。

EDIT: Let me clear things up - my question is, why starting the animation on post causes it to start, when starting the animation on the main thread does not. 编辑：让我清楚一点 - 我的问题是，为什么在帖子上启动动画会导致它启动，当在主线程上启动动画时没有。

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解决方案：

参考： https://stackoom.com/en/question/w4Pv