1 package com.example.huanshop.widget;
 2 
 3 import android.content.Context;
 4 import android.util.AttributeSet;
 5 import android.view.MotionEvent;
 6 import android.widget.ScrollView;
 7 
 8 public class MyScrollView extends ScrollView {
 9 
10     private float xDistance;
11     private float yDistance;
12     private float xLast;
13     private float yLast;
14 
15     public MyScrollView(Context context) {
16         super(context);
17         // TODO Auto-generated constructor stub
18     }
19 
20     public MyScrollView(Context context, AttributeSet attrs, int defStyle) {
21         super(context, attrs, defStyle);
22         // TODO Auto-generated constructor stub
23     }
24 
25     public MyScrollView(Context context, AttributeSet attrs) {
26         super(context, attrs);
27         // TODO Auto-generated constructor stub
28     }
29 
30     @Override
31     public boolean onInterceptTouchEvent(MotionEvent ev) {
32         switch (ev.getAction()) {
33         case MotionEvent.ACTION_DOWN:
34             xDistance = yDistance = 0.0f;
35             xLast = ev.getX();
36             yLast = ev.getY();
37             break;
38         case MotionEvent.ACTION_MOVE:
39             final float curX = ev.getX();
40             final float curY = ev.getY();
41             xDistance += Math.abs(curX - xLast);
42             yDistance += Math.abs(curY - yLast);
43             if (xDistance > yDistance)
44                 return false;
45             break;
46         default:
47             break;
48         }
49         return super.onInterceptTouchEvent(ev);
50     }
51 
52 }