封装的android监听手指左右滑动屏幕的事件类分享

左右滑动是智能手机最常用的动作，在此简单的封装了一下，以后直接拿来用就可以了。

简单的只需要几行就可以了，下面那个类是封装好了的。

package com.example.test;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.widget.RelativeLayout;

public class MainActivity extends Activity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);//这里的xml是一个空白的layout
 
 //需要监听左右滑动事件的view
 RelativeLayout view = (RelativeLayout) this.findViewById(R.id.layout);
 
 //setLongClickable是必须的
 view.setLongClickable(true);
 view.setonTouchListener(new MyGestureListener(this));
 }
 
 
 private class MyGestureListener extends GestureListener {
 public MyGestureListener(Context context) {
  super(context);
 }

 @Override
 public boolean left() {
  Log.e("test", "向左滑");
  return super.left();
 }

 @Override
 public boolean right() {
  Log.e("test", "向右滑");
  return super.right();
 }
 }
}

package com.example.test;

import android.content.Context;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.GestureDetector;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.MotionEvent;


public class GestureListener extends SimpleonGestureListener implements onTouchListener {
 
 private int distance = 100;
 
 private int velocity = 200;
 
 private GestureDetector gestureDetector;
 
 public GestureListener(Context context) {
 super();
 gestureDetector = new GestureDetector(context, this);
 }

 
 public boolean left() {
 return false;
 }
 
 
 public boolean right() {
 return false;
 }
 
 @Override
 public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
  float velocityY) {
 // TODO Auto-generated method stub
 // 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）

 // 向左滑
 if (e1.getX() - e2.getX() > distance
  && Math.abs(velocityX) > velocity) {
  left();
 }
 // 向右滑
 if (e2.getX() - e1.getX() > distance
  && Math.abs(velocityX) > velocity) {
  right();
 }
 return false;
 }

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

 public int getDistance() {
 return distance;
 }

 public void setDistance(int distance) {
 this.distance = distance;
 }

 public int getVelocity() {
 return velocity;
 }

 public void setVelocity(int velocity) {
 this.velocity = velocity;
 }

 public GestureDetector getGestureDetector() {
 return gestureDetector;
 }

 public void setGestureDetector(GestureDetector gestureDetector) {
 this.gestureDetector = gestureDetector;
 }
}