android scrollview 自动滚动到顶部或者底部

//设置默认滚动到顶部
 scrollView.post( new Runnable() {

  @Override
  public void run() {
  // TODO Auto-generated method stub
  scrollView.fullScroll(ScrollView.FOCUS_UP);
  }
 });

//设置默认滚动到底部
 scrollView.post( new Runnable() {

  @Override
  public void run() {
  // TODO Auto-generated method stub
  scrollView.fullScroll(ScrollView.FOCUS_DOWN);
  }
 });