http://blog.csdn.net/aben_2005/article/details/6417423
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Android Gesture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);
- }
- }
- }
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