当前位置: 代码迷 >> Android >> 转载:Android GestureDetector手势识别种
  详细解决方案

转载:Android GestureDetector手势识别种

热度:25   发布时间:2016-05-01 20:21:51.0
转载:Android GestureDetector手势识别类
原文地址:http://blog.csdn.net/aben_2005/article/details/6417423

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);	}

详细的测试例子如下:
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);		}			}}

  相关解决方案