android 手势识别

 首先，在Android系统中，每一次手势交互都会依照以下顺序执行。

 1. 触发onTouch事件。

 2. 调用mGestureDetector.onTouchEvent(event)方法，传递event对象

代码如下：

package com.drision.ontouchlistenerdemo;

import android.content.Context;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.widget.Toast;

public class MyGestureLintener extends SimpleOnGestureListener
{
private Context context;

public MyGestureLintener(Context context) {
super();
this.context = context;
}

// 单击，触摸屏按下时立刻触发
/*@Override
public boolean onDown(MotionEvent e) {
// TODO Auto-generated method stub
Toast.makeText(context, "Down " + e.getAction(), Toast.LENGTH_SHORT)
.show();
return true;
}*/
// 双击，手指在触摸屏上迅速点击第二下时触发
@Override
public boolean onDoubleTap(MotionEvent e)
{
Toast.makeText(context, "onDoubleTap "+e.getAction(), Toast.LENGTH_SHORT)
.show();
return super.onDoubleTap(e);
}

// 双击的按下跟抬起各触发一次
@Override
public boolean onDoubleTapEvent(MotionEvent e)
{
Toast.makeText(context, "onDoubleTapEvent "+e.getAction(), Toast.LENGTH_SHORT)
.show();
return super.onDoubleTapEvent(e);
}

// 滑动，触摸屏按下后快速移动并抬起，会先触发滚动手势，跟着触发一个滑动手势
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY)
{
Toast.makeText(context, "onFling "+e2.getAction(), Toast.LENGTH_SHORT)
.show();
return super.onFling(e1, e2, velocityX, velocityY);
}

// 长按，触摸屏按下后既不抬起也不移动，过一段时间后触发
@Override
public void onLongPress(MotionEvent e)
{
Toast.makeText(context, "LONG " + e.getAction(), Toast.LENGTH_SHORT)
.show();
}

// 滚动，触摸屏按下后移动
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY)
{
Toast.makeText(context, "onScroll " + e2.getAction(),
Toast.LENGTH_SHORT).show();
return true;
}

// 短按，触摸屏按下后片刻后抬起，会触发这个手势，如果迅速抬起则不会
@Override
public void onShowPress(MotionEvent e)
{
Toast.makeText(context, "Show " + e.getAction(), Toast.LENGTH_SHORT)
.show();
}
}
// 单击确认，即很快的按下并抬起，但并不连续点击第二下
/*
* @Override public boolean onSingleTapConfirmed(MotionEvent e) { // TODO
* Auto-generated method stub Toast.makeText(context, "onSingleTapConfirmed " +
* e.getAction(), Toast.LENGTH_SHORT) .show(); return true; }
*/
// 抬起，手指离开触摸屏时触发(长按、滚动、滑动时，不会触发这个手势)
/*
* @Override public boolean onSingleTapUp(MotionEvent e) { // TODO
* Auto-generated method stub Toast.makeText(context, "onSingleTapUp " +
* e.getAction(), Toast.LENGTH_SHORT) .show(); return true; }
*/

package com.drision.ontouchlistenerdemo;

import android.os.Bundle;
import android.app.Activity;
import android.view.GestureDetector;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.TextView;

public class MainActivity extends Activity implements OnTouchListener{
private GestureDetector mGestureDetector;//手势对象
private MyGestureLintener myGestureLintener;//手势监听的接口对象

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView tv=(TextView) findViewById(R.id.tv);

myGestureLintener = new MyGestureLintener(this);
//手势对象的构造方法
mGestureDetector = new GestureDetector(this,
myGestureLintener);
tv.setOnTouchListener(this);
tv.setLongClickable(true);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

@Override
public boolean onTouch(View v, MotionEvent event)
{
return mGestureDetector.onTouchEvent(event);
}
}