Android ScrollView监听值判断在底部还是顶部

if (mScroll.getScrollY()<=0)
{
Log.i(TAG, "滑动到顶部");
}
//dibuzhuangtai
if (mScroll.getChildAt(0).getMeasuredHeight()<=mScroll.getHeight()+mScroll.getScrollY())
{
Log.i(TAG, "滑动到底部: ");
Log.i(TAG, "onTouch: ");
//////.getScrollY()滚动条滚动的     距离

mText.append(getResources().getString(R.string.content));
}

switch (view.getId())
{
case R.id.up:
//scrollTo和scrollBy的区别
//scrollTo参考系最开始的位置
//scrollBy参考系

mScroll.scrollBy(0,-30);
break;
case  R.id.down:
mScroll.scrollBy(0,30);
break;
}