ScrollView使用 http://www.cnblogs.com/androidsj/archive/2012/03/04/2379387.html

滚动到顶部判断:
getScrollY() == 0
滚动到底部判断:
View childView = getChildAt(0);
childView.getMeasuredHeight() <= getScrollY() + getHeight();
其中getChildAt表示得到ScrollView的child View
childView.getMeasuredHeight()表示得到子View的高度,
 getScrollY()表示得到y轴的滚动距离，
getHeight()为scrollView的高度
getScrollY()达到最大时加上scrollView的高度就的就等于它内容的高度了.
判断滑动位置的地方，可以有两种方式：
1、实现OnTouchListener来监听是否滑动到最底部
 OnTouchListener onTouchListener=new OnTouchListener(){  
            @Override  
            public boolean onTouch(View v, MotionEvent event) { 
                switch (event.getAction()) {
                    case MotionEvent.ACTION_UP:
                        if (childView  != null && childView .getMeasuredHeight()< = getScrollY() + getHeight()) {
                        } else if (getScrollY() == 0) {
                        }
                    break;
                }
                return false;
            }
 } 
2、重写ScrollView的onScrollChanged的方法，在onScrollChanged函数中判断
public class myScrollView extends ScrollView
{
    public myScrollView(Context context)
    {
        super(context);
    }
    public myScrollView(Context context, AttributeSet attributeSet)
    {
        super(context,attributeSet);
    }
    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt)
    {
        View view = (View)getChildAt(getChildCount()-1);
        int d = view.getBottom();
        d -= (getHeight()+getScrollY());
        if(d==0)
        {
            //you are at the end of the list in scrollview 
            //do what you wanna do here
        }
        else
            super.onScrollChanged(l,t,oldl,oldt);
    }
}