手势识别

[功能]
何为手势识别? 比如：你在屏幕上从左至右划出的一个动作 这就是手势 能够识别这个的就是 手势识别

[思路]
1. android 有一个手势识别的类：OnGestureListener
2. 在 GestureDetector() 中使用上面的class 即可 系统就会把手势交由该类来处理

public class SampleGuest implements OnGestureListener {   
        Activity activity;   
           
        public SampleGuest(Activity a){   
            activity = a;   
        }   
       
        // called automatically, any screen action will Triggered it   
        public boolean onTouchEvent(MotionEvent me){   
            return gesture.onTouchEvent(me);   
        }   
  
        @Override  
        public boolean onDown(MotionEvent e) {   
            // TODO Auto-generated method stub   
            Log.d("TAG","[+++++++++++][onDown]");   
            return true;   
        }   
  
        @Override  
        //e1, the begin of ACTION_DOWN MotionEvent   
        //e2, the end of ACTION_DOWN MotionEvent   
        // velocityX, the motion speed in X   
        // velocityY：the motion speed in y   
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,   
                float velocityY) {   
            // TODO Auto-generated method stub   
            if ((e1.getX() - e2.getX() > VALUE_DISTANCE)   
                    && Math.abs(velocityX) > VALUE_SPEED) {   
                Log.d("TAG","[+++++++++++][onFling][Fling left]");   
            } else if ((e2.getX() - e1.getX() > VALUE_DISTANCE)   
                    && Math.abs(velocityX) > VALUE_SPEED) {   
                Log.d("TAG","[+++++++++++][onDown][Fling right]");   
  
            }   
            return true;   
        }   
  
        @Override  
        public void onLongPress(MotionEvent e) {   
            // TODO Auto-generated method stub   
            Log.d("TAG","[+++++++++++][onLongPress]");   
        }   
  
        @Override  
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,   
                float distanceY) {   
            // TODO Auto-generated method stub   
            Log.d("TAG","[+++++++++++][onScroll]");   
            return true;   
        }   
  
        @Override  
        public void onShowPress(MotionEvent e) {   
            // TODO Auto-generated method stub   
            Log.d("TAG","[+++++++++++][onShowPress]");   
        }   
  
        @Override  
        public boolean onSingleTapUp(MotionEvent e) {   
            // TODO Auto-generated method stub   
            Log.d("TAG","[+++++++++++][onSingleTapUp]");   
            return true;   
        }   
           
    }  

 

2. 如何使用

SampleGuest sg = new SampleGuest(this);   
GestureDetector gesture = new GestureDetector(sg);