025_01GestureDetector类及其用法简介

 1 package com.cskaoyan.mobilemanager;
 2 
 3  
 4 import android.app.Activity;
 5 import android.os.Bundle;
 6 import android.view.GestureDetector;
 7 import android.view.MotionEvent;
 8 import android.view.View;
 9 import android.view.GestureDetector.SimpleOnGestureListener;
10 
11 public abstract class SetupBaseActivity extends Activity {
12     private GestureDetector gestureDetector;
13 
14     @Override
15     protected void onCreate(Bundle savedInstanceState) {
16         // TODO Auto-generated method stub
17         super.onCreate(savedInstanceState);
18         gestureDetector = new GestureDetector(this, new MyGestureDetectorLinstener());
19 
20     }
21     
22     class MyGestureDetectorLinstener extends SimpleOnGestureListener{
23         @Override
24         public boolean onFling(
25                 MotionEvent e1,  //开始滑动的那个点 
26                 MotionEvent e2,  //滑动停止的那个点
27                 float velocityX, //x方向上滑动的速度
28                 float velocityY) //y方向上滑动的速度
29                 {
30                 // TODO Auto-generated method stub
31                 float startx =e1.getX();
32                 float starty =e1.getY();
33                 float endx   =e2.getX();
34                 float endy   =e2.getY();
35             
36                 if (endx -startx >150 ) {
37                     //滑动到上一页
38                     previous();
39                     System.out
40                     .println("Setup1Activity.MyGestureDetectorLinstener.onFling() show previous" );
41                 }
42                 else if (startx-endx>150) {
43                     System.out
44                     .println("Setup1Activity.MyGestureDetectorLinstener.onFling() show next" );
45                    //滑动到下一页
46                     next();
47                 }
48                 return super.onFling(e1, e2, velocityX, velocityY);
49                }
50         
51         
52     }
53     
54     @Override
55     public boolean onTouchEvent(MotionEvent event) {
56         // TODO Auto-generated method stub
57         
58         gestureDetector.onTouchEvent(event);
59         return super.onTouchEvent(event);
60     }
61     
62     public abstract void next();
63     public abstract void previous();
64   }