滚动型scrollTo不起作用

问题描述

相同的问题ScrollView .scrollTo不工作？保存在旋转滚动型位置

我动态地的onCreate项目添加到滚动视图。我尝试以下方法添加的所有项目后：

I dynamically add items to scrollView in onCreate. I try the following after all items were added:

    // 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);

我的结论是有一些事件如DOM就绪？是否有任何回调？

I conclude that there is some event like 'DOM-ready'? Are there any callbacks?

推荐答案

您不必延长滚动型和创建自己的每通过的的<一个href="http://stackoverflow.com/questions/9753603/using-smoothscrollby-method-in-android-scrollview-class?rq=1">this问题。

You don't need to extend the ScrollView and create your own as per the answer provided by David Daudelin for the this question.

获得 ViewTreeObserver 的滚动型并添加 OnGlobalLayoutListener 到 ViewTreeObserver 。然后调用从<$ C $的 onGlobalLayout（）方法 ScrollView.scrollTo（X，Y）方法C> OnGlobalLayoutListener 。 code：

Get the ViewTreeObserver of the ScrollView and add an OnGlobalLayoutListener to the ViewTreeObserver. Then call the ScrollView.scrollTo(x,y) method from the onGlobalLayout() method of the OnGlobalLayoutListener. Code:

 ScrollView mainScroll = (ScrollView) findViewById(R.id.average_scroll_mainScroll);

 ViewTreeObserver vto = scrollView.getViewTreeObserver();
 vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
      public void onGlobalLayout() {
           mainScroll.scrollTo(0, 0);
      }
 });

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