自定義ScrollView

public class MyScrollView extends ScrollView {  

    private GestureDetector mGestureDetector;  

    public MyScrollView(Context context, AttributeSet attrs) {  
        super(context, attrs);  
        mGestureDetector = new GestureDetector(context, new YScrollDetector());  
    }  

    @Override
 
  
    public boolean onInterceptTouchEvent(MotionEvent ev) {  
        return super.onInterceptTouchEvent(ev)  
                && mGestureDetector.onTouchEvent(ev);  
    }  

    class YScrollDetector extends SimpleOnGestureListener {  

        @Override  
        public boolean onScroll
 
(MotionEvent e1, MotionEvent e2,  
                float distanceX, float distanceY) {  
            /** 
             * 如果我們滾動更接近水平方向,返回false,讓子檢視來處理它 
             */  
            return (Math.abs(distanceY) > Math.abs(distanceX));  
        }  
    }  
}  

針對不顯示的問題,要呼叫scrollview的一個方法

scrollview.smoothScrollTo
 
(0, 20);