如何在onCreate时拿到UI的大小

我们可以在初始化view之后，使用

view.post(new Runnable(){

public void run(){

view.getHeight();

view.getwidth();

}

});

就可以拿到宽和高了。

那么为什么这种方法可以拿到呢?我们来看一下源码

public boolean post(Runnable action) {
    final AttachInfo attachInfo = mAttachInfo;
    if (attachInfo != null) {
        return attachInfo.mHandler.post(action);
    }

    // Postpone the runnable until we know on which thread it needs to run.
    // Assume that the runnable will be successfully placed after attach.
    getRunQueue().post(action);
    return true;
}

可以看到,系统帮助我们调用了handler.post方法,将其放置到消息队列中.