判断ListView滑动到顶部或底部

public boolean isBottom(final ListView listView) {
        boolean result=false;
        if (listView.getLastVisiblePosition() == (listView.getCount() - 1)) {
            final View bottomChildView = listView.getChildAt(listView.getLastVisiblePosition() - listView.getFirstVisiblePosition());
            result= (listView.getHeight()>=bottomChildView.getBottom());
        };
        return  result;
    }

public boolean isTop(final ListView listView) {
        boolean result=false;
        if(listView.getFirstVisiblePosition()==0){
            final View topChildView = listView.getChildAt(0);
            result=topChildView.getTop()==0;
        }
        return result ;
   }