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Android GestureDetector手势识别种

分类: IT文章 • 2022-05-12 14:35:44
Android GestureDetector手势识别类

为了加强鼠标响应事件，Android提供了GestureDetector手势识别类。通过GestureDetector.OnGestureListener 来获取当前被触发的操作手势（Single Tap Up、Show Press、Long Press、Scroll、Down、Fling），具体包括以下几种：

boolean  onDoubleTap(MotionEvent e)
解释：双击的第二下Touch down时触发
boolean  onDoubleTapEvent(MotionEvent e)
解释：双击的第二下Touch down和up都会触发，可用e.getAction()区分。
boolean  onDown(MotionEvent e)
解释：Touch down时触发
boolean  onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
解释：Touch了滑动一点距离后，up时触发。
void  onLongPress(MotionEvent e)
解释：Touch了不移动一直Touch down时触发
boolean  onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
解释：Touch了滑动时触发。
void  onShowPress(MotionEvent e)
解释：Touch了还没有滑动时触发
（与onDown，onLongPress比较
onDown只要Touch down一定立刻触发。
而Touchdown后过一会没有滑动先触发onShowPress再是onLongPress。
所以Touchdown后一直不滑动，onDown->onShowPress->onLongPress这个顺序触发。


boolean  onSingleTapConfirmed(MotionEvent e)
boolean  onSingleTapUp(MotionEvent e)
解释：上面这两个函数都是在touch down后又没有滑动（onScroll），又没有长按（onLongPress），然后Touchup时触发。

点击一下非常快的（不滑动）Touchup：
onDown->onSingleTapUp->onSingleTapConfirmed
点击一下稍微慢点的（不滑动）Touchup：
onDown->onShowPress->onSingleTapUp->onSingleTapConfirmed

使用GestureDetector需要在View中重写onTouchEvent事件，例如：

GestureDetector mGesture = null;
@Override
	public boolean onTouch(View v, MotionEvent event)
	{
		// TODO Auto-generated method stub
		return mGesture.onTouchEvent(event);
	}

  详细的测试例子一：

package com.jiubang.android.gesturetest;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.View.OnTouchListener;
import android.widget.Button;

public class GestureActivity extends Activity
			implements OnTouchListener
{
	private Button mButton = null;
	GestureDetector mGesture = null;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        Log.i("TEST", "onCreate");
        mButton = (Button)findViewById(R.id.button1);
        mButton.setOnTouchListener(this);
        mGesture = new GestureDetector(this, new GestureListener());
    }

	@Override
	public boolean onTouch(View v, MotionEvent event)
	{
		// TODO Auto-generated method stub
		return mGesture.onTouchEvent(event);
	}
	
	class GestureListener extends SimpleOnGestureListener
	{

		@Override
		public boolean onDoubleTap(MotionEvent e)
		{
			// TODO Auto-generated method stub
			Log.i("TEST", "onDoubleTap");
			return super.onDoubleTap(e);
		}

		@Override
		public boolean onDown(MotionEvent e)
		{
			// TODO Auto-generated method stub
			Log.i("TEST", "onDown");
			return super.onDown(e);
		}

		@Override
		public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
				float velocityY)
		{
			// TODO Auto-generated method stub
			Log.i("TEST", "onFling:velocityX = " + velocityX + " velocityY" + velocityY);
			return super.onFling(e1, e2, velocityX, velocityY);
		}

		@Override
		public void onLongPress(MotionEvent e)
		{
			// TODO Auto-generated method stub
			Log.i("TEST", "onLongPress");
			super.onLongPress(e);
		}

		@Override
		public boolean onScroll(MotionEvent e1, MotionEvent e2,
				float distanceX, float distanceY)
		{
			// TODO Auto-generated method stub
			Log.i("TEST", "onScroll:distanceX = " + distanceX + " distanceY = " + distanceY);
			return super.onScroll(e1, e2, distanceX, distanceY);
		}

		@Override
		public boolean onSingleTapUp(MotionEvent e)
		{
			// TODO Auto-generated method stub
			Log.i("TEST", "onSingleTapUp");
			return super.onSingleTapUp(e);
		}
		
	}
}

测试例子二：

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.TextView;
import android.widget.Toast;

public class GestureActivity extends Activity implements OnTouchListener,
        OnGestureListener {

    GestureDetector detector;

    public GestureActivity() {
        detector = new GestureDetector(this);
    }
    
    public void onCreate(Bundle savedInstanceState) {  
            super.onCreate(savedInstanceState);  
            setContentView(R.layout.main);  
            TextView tv = (TextView) findViewById(R.id.TextView001);
            //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();  
    }  
    

}
 

 摘自：http://blog.csdn.net/aben_2005/article/details/6417423

        http://www.cnblogs.com/xiaobuild/archive/2011/09/02/2163866.html

GestureDetector API :http:www.cnblogs.com/over140/archive/2011/01/17/1937044.html


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