相关疑难解决方法(0)

与ScrollView相同的问题.scrollTo无法正常工作？在旋转时保存ScrollView位置

我在onCreate中动态添加项目到scrollView.添加完所有项目后,我会尝试以下操作:

    // no effect
    ScrollView mainScroll = (ScrollView) findViewById(R.id.average_scroll_mainScroll);

    // no effect
    ScrollView mainScroll = (ScrollView) findViewById(R.id.average_scroll_mainScroll);
    mainScroll.post(new Runnable() {
        public void run(){
            ScrollView mainScroll = (ScrollView) findViewById(R.id.average_scroll_mainScroll);
            mainScroll.scrollTo(0, 0);
        } 
    });

    // works like a charm
    ScrollView mainScroll = (ScrollView) findViewById(R.id.average_scroll_mainScroll);
    mainScroll.postDelayed(new Runnable() {
        public void run(){
            ScrollView mainScroll = (ScrollView) findViewById(R.id.average_scroll_mainScroll);
            mainScroll.scrollTo(0, 0);
        } 
    }, 30);

我得出结论,有一些事件像'DOM-ready'？有没有回调？