SimpleOnGestureListener//简单手势监听

SimpleOnGestureListener//简单手势监听

方法:

(1) public boolean  onFling   (MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)

Notified of a fling event when it occurs with the initial on down MotionEvent and the matching up MotionEvent. The calculated velocity is supplied along the x and y axis in pixels per second.

//通知一个抛(扔,掷)事件,当它随着一个最初的向下的运动事件和匹配的运动事件发生时。计算的速率是通过x,y轴上每秒的像素值确定的。

Parameters//参数

e1:The first down motion event that started the fling.//开始这个"抛"的第一次向下的运动事件.

e2:The move motion event that triggered the current onFling.//引起当前的"抛"的运动事件。

velocityX:The velocity of this fling measured in pixels per second along the x axis.//以沿着x轴某秒多少像素数测量的"抛"的速率.

velocityY:The velocity of this fling measured in pixels per second along the y axis.// 以沿着y轴某秒多少像素数测量的"抛"的速率.

Returns

• true if the event is consumed, else false//如果事件被消耗,返回true,否则返回false.
• 
  

例子:

(1)写一个类继承SimpleOngestureListener

import android.view.MotionEvent;
import android.view.GestureDetector.SimpleOnGestureListener;


public class DefaultListener extends SimpleOnGestureListener {
	/**
	 * 两次轻敲时调用
	 */
	@Override
	public boolean onDoubleTap(MotionEvent e) {
		// TODO Auto-generated method stub


		int action = e.getAction();
		System.out.println("两次轻敲，onDoubleTap," + action);
		return super.onDoubleTap(e);
	}


	@Override
	// 按下时调用
	public boolean onDown(MotionEvent e) {
		// TODO Auto-generated method stub
		System.out.println("按下,onDown==" + e.getAction());// onDown=0
		return super.onDown(e);
	}


	// 滑动一段距离，up时触发
	@Override
	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
			float velocityY) {
		// TODO Auto-generated method stub
		System.out.println("抛," + "e1===" + e1.getAction() + ",e2==="
				+ e2.getAction());// 0
		System.out.println("velocityX===" + velocityX + ",velocityY==="
				+ velocityY);// 1
		return super.onFling(e1, e2, velocityX, velocityY);
	}


	@Override
	public boolean onDoubleTapEvent(MotionEvent e) {
		// TODO Auto-generated method stub
		System.out.println("两次轻敲事件,onDoubleTapEven==" + e.getAction());
		return super.onDoubleTapEvent(e);
	}


	// 长按后触发(Touch down之后一定时间（500ms）)
	@Override
	public void onLongPress(MotionEvent e) {
		// TODO Auto-generated method stub
		System.out.println("长按,onLongPress==" + e.getAction());
		super.onLongPress(e);
	}


	@Override
	public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
			float distanceY) {
		// TODO Auto-generated method stub
		System.out.println("滑动时调用," + "e1===" + e1.getAction() + ",e2==="
				+ e2.getAction());
		return super.onScroll(e1, e2, distanceX, distanceY);
	}


	@Override
	public void onShowPress(MotionEvent e) {
		// TODO Auto-generated method stub
		System.out.println("短按,onShowPress==" + e.getAction());
		super.onShowPress(e);
	}


	@Override
	// 按下时调用
	public boolean onSingleTapConfirmed(MotionEvent e) {
		// TODO Auto-generated method stub
		System.out.println("onSingleTapConfirmed,单击确认==" + e.getAction());// 0
		return super.onSingleTapConfirmed(e);
	}


	@Override
	// 按下时调用
	public boolean onSingleTapUp(MotionEvent e) {
		// TODO Auto-generated method stub
		System.out.println("onSingleTapUp==" + e.getAction());// 1
		return super.onSingleTapUp(e);
	}


}

(2)在一个Activity里面重写onTouchEvent(),并且将上面的那个类的对象作为参数传递给GestureDetector。如下所示:

import android.os.Bundle;
import android.app.Activity;
import android.view.GestureDetector;
import android.view.MotionEvent;

public class MainActivity extends Activity {

	private GestureDetector gestureDetector;
	private DefaultListener defaultListener;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		defaultListener = new DefaultListener();
		gestureDetector = new GestureDetector(getApplicationContext(),
				defaultListener);
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {

		return gestureDetector.onTouchEvent(event);
	}

}