android手势判断

package com.example.test_shoushi;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.RelativeLayout;
import android.widget.Toast;

public class MainActivity extends Activity implements OnTouchListener,
        OnGestureListener {

    GestureDetector detector;

    public MainActivity() {
        detector = new GestureDetector(this);
    }
   
    public void onCreate(Bundle savedInstanceState) { 
            super.onCreate(savedInstanceState); 
            setContentView(R.layout.activity_main); 
            RelativeLayout tv = (RelativeLayout) findViewById(R.id.aaa);
            //设置tv的监听器 
            tv.setOnTouchListener(this); 
            tv.setFocusable(true);
            //必须，view才能够处理不同于Tap（轻触）的hold
            tv.setClickable(true); 
            tv.setLongClickable(true); 
            detector.setIsLongpressEnabled(true); 
    } 
   
   
    /*
     * 在onTouch()方法中，我们调用GestureDetector的onTouchEvent()方法，将捕捉到的MotionEvent交给GestureDetector
     * 来分析是否有合适的callback函数来处理用户的手势
     */  
    public boolean onTouch(View v, MotionEvent event) { 
        return detector.onTouchEvent(event); 
    } 
 
    // 用户轻触触摸屏，由1个MotionEvent ACTION_DOWN触发 
    public boolean onDown(MotionEvent arg0) { 
        Log.i("MyGesture", "onDown"); 
        Toast.makeText(this, "onDown", Toast.LENGTH_SHORT).show(); 
        return true; 
    } 
     
    /*
     * 用户轻触触摸屏，尚未松开或拖动，由一个1个MotionEvent ACTION_DOWN触发
     * 注意和onDown()的区别，强调的是没有松开或者拖动的状态
     */ 
    public void onShowPress(MotionEvent e) { 
        Log.i("MyGesture", "onShowPress"); 
        Toast.makeText(this, "onShowPress", Toast.LENGTH_SHORT).show(); 
    } 
     
    // 用户（轻触触摸屏后）松开，由一个1个MotionEvent ACTION_UP触发 
    public boolean onSingleTapUp(MotionEvent e) { 
        Log.i("MyGesture", "onSingleTapUp"); 
        Toast.makeText(this, "onSingleTapUp", Toast.LENGTH_SHORT).show(); 
        return true; 
    } 
     
    // 用户按下触摸屏、快速移动后松开，由1个MotionEvent ACTION_DOWN, 多个ACTION_MOVE, 1个ACTION_UP触发 
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { 
        Log.i("MyGesture", "onFling"); 
       
        // 参数解释： 
        // e1：第1个ACTION_DOWN MotionEvent 
        // e2：最后一个ACTION_MOVE MotionEvent 
        // velocityX：X轴上的移动速度，像素/秒 
        // velocityY：Y轴上的移动速度，像素/秒 
     
        // 触发条件 ： 
        // X轴的坐标位移大于FLING_MIN_DISTANCE，且移动速度大于FLING_MIN_VELOCITY个像素/秒 
         
        final int FLING_MIN_DISTANCE = 100, FLING_MIN_VELOCITY = 200; 
        if (e1.getX() - e2.getX() > FLING_MIN_DISTANCE && Math.abs(velocityX) > FLING_MIN_VELOCITY) { 
            // Fling left 
            Log.i("MyGesture", "Fling left"); 
            Toast.makeText(this, "Fling Left", Toast.LENGTH_SHORT).show(); 
        } else if (e2.getX() - e1.getX() > FLING_MIN_DISTANCE && Math.abs(velocityX) > FLING_MIN_VELOCITY) { 
            // Fling right 
            Log.i("MyGesture", "Fling right"); 
            Toast.makeText(this, "Fling Right", Toast.LENGTH_SHORT).show(); 
        } else if(e2.getY()-e1.getY()>FLING_MIN_DISTANCE && Math.abs(velocityY)>FLING_MIN_VELOCITY) {
            // Fling down 
            Log.i("MyGesture", "Fling down"); 
            Toast.makeText(this, "Fling down", Toast.LENGTH_SHORT).show();
        } else if(e1.getY()-e2.getY()>FLING_MIN_DISTANCE && Math.abs(velocityY)>FLING_MIN_VELOCITY) {
            // Fling up 
            Log.i("MyGesture", "Fling up"); 
            Toast.makeText(this, "Fling up", Toast.LENGTH_SHORT).show();
        } 
       
       
        return false;
        
    } 
     
    // 用户按下触摸屏，并拖动，由1个MotionEvent ACTION_DOWN, 多个ACTION_MOVE触发 
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { 
        Log.i("MyGesture", "onScroll"); 
        Toast.makeText(this, "onScroll", Toast.LENGTH_LONG).show(); 
        return true; 
    } 
     
    // 用户长按触摸屏，由多个MotionEvent ACTION_DOWN触发 
    public void onLongPress(MotionEvent e) { 
        Log.i("MyGesture", "onLongPress"); 
        Toast.makeText(this, "onLongPress", Toast.LENGTH_LONG).show(); 
    } 
   

}