有人说scrollView。Post没用。

如果你不想用scrollView。postDelayed，另一种选择是使用侦听器。下面是我在另一个用例中所做的:

ViewTreeObserver.OnPreDrawListener viewVisibilityChanged = new ViewTreeObserver.OnPreDrawListener() {
    @Override
    public boolean onPreDraw() {
        if (my_view.getVisibility() == View.VISIBLE) {
            scroll_view.smoothScrollTo(0, scroll_view.getHeight());
        }
        return true;
    }
};

你可以这样把它添加到视图中:

my_view.getViewTreeObserver().addOnPreDrawListener(viewVisibilityChanged);

这招立竿见影。没有延迟。

// wait for the scroll view to be laid out
scrollView.post(new Runnable() {
  public void run() {
    // then wait for the child of the scroll view (normally a LinearLayout) to be laid out
    scrollView.getChildAt(0).post(new Runnable() {
      public void run() {
        // finally scroll without animation
        scrollView.scrollTo(0, scrollView.getBottom());
      }
    }
  }
}

当视图尚未加载时，您不能滚动。你可以“稍后”用上面的post或sleep call来做这件事，但这不是很优雅。

最好计划滚动并在下一个onLayout()中执行。示例代码如下:

https://stackoverflow.com/a/10209457/1310343

这并不是问题的确切答案，但我需要在EditText获得焦点后立即向下滚动。然而，公认的答案将使ET也失去焦点(我假设ScrollView)。

我的解决方案如下:

emailEt.setOnFocusChangeListener(new View.OnFocusChangeListener() {
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if(hasFocus){
            Toast.makeText(getActivity(), "got the focus", Toast.LENGTH_LONG).show();
            scrollView.postDelayed(new Runnable() {
                @Override
                public void run() {
                    scrollView.fullScroll(ScrollView.FOCUS_DOWN);
                }
            }, 200);
        }else {
            Toast.makeText(getActivity(), "lost the focus", Toast.LENGTH_LONG).show();
        }
    }
});

我增加工作完美。

    private void sendScroll(){
        final Handler handler = new Handler();
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {Thread.sleep(100);} catch (InterruptedException e) {}
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        scrollView.fullScroll(View.FOCUS_DOWN);
                    }
                });
            }
        }).start();
    }

Note

这个答案是一个非常老版本的android的变通方案。今天postDelayed已经没有这个bug了，你应该使用它。

最适合我的是

scroll_view.post(new Runnable() {
     @Override
     public void run() {
         // This method works but animates the scrolling 
         // which looks weird on first load
         // scroll_view.fullScroll(View.FOCUS_DOWN);

         // This method works even better because there are no animations.
         scroll_view.scrollTo(0, scroll_view.getBottom());
     }
});