android 判断左右滑动，上下滑动的GestureDetector简单手势检测

直接加入监听GestureDetector放在需要判断滑动手势的地方：

 1 import android.app.Activity;
 2 import android.os.Bundle;
 3 import android.util.Log;
 4 import android.view.GestureDetector;
 5 import android.view.GestureDetector.OnGestureListener;
 6 import android.view.MotionEvent;
 7
 8 public class MainActivity extends Activity {
 9     protected static final float FLIP_DISTANCE = 50;
10     GestureDetector mDetector;
11
12     @Override
13     protected void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15         setContentView(R.layout.activity_main);
16
17         mDetector = new GestureDetector(this, new OnGestureListener() {
18
19             @Override
20             public boolean onSingleTapUp(MotionEvent e) {
21                 // TODO Auto-generated method stub
22                 return false;
23             }
24
25             @Override
26             public void onShowPress(MotionEvent e) {
27                 // TODO Auto-generated method stub
28
29             }
30
31             @Override
32             public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
33                 // TODO Auto-generated method stub
34                 return false;
35             }
36
37             @Override
38             public void onLongPress(MotionEvent e) {
39                 // TODO Auto-generated method stub
40
41             }
42
43             /**
44              *
45              * e1 The first down motion event that started the fling. e2 The
46              * move motion event that triggered the current onFling.
47              */
48             @Override
49             public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
50                 if (e1.getX() - e2.getX() > FLIP_DISTANCE) {
51                     Log.i("TAG", "<--- left, left, go go go");
52                     return true;
53                 }
54                 if (e2.getX() - e1.getX() > FLIP_DISTANCE) {
55                     Log.i("TAG", "right, right, go go go --->");  //忽然觉得这个log好智障...
56                     return true;
57                 }
58                 if (e1.getY() - e2.getY() > FLIP_DISTANCE) {
59                     Log.i("TAG", "向上滑...");
60                     return true;
61                 }
62                 if (e2.getY() - e1.getY() > FLIP_DISTANCE) {
63                     Log.i("TAG", "向下滑...");
64                     return true;
65                 }
66
67                 Log.d("TAG", e2.getX() + " " + e2.getY());
68
69                 return false;
70             }
71
72             @Override
73             public boolean onDown(MotionEvent e) {
74                 // TODO Auto-generated method stub
75                 return false;
76             }
77         });
78     }
79
80     @Override
81     public boolean onTouchEvent(MotionEvent event) {
82         return mDetector.onTouchEvent(event);
83     }
84 }