Encapsulated android listens for finger swiping left and right on the screen for event class sharing

Left and right sliding is the most commonly used smart phone action, in this simple package 1, after the direct use of it.

It simply takes a few lines, but the following class is encapsulated.

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);// Here, xml is 1 A blank layout
 
 // Need to listen for left-right sliding events view
 RelativeLayout view = (RelativeLayout) this.findViewById(R.id.layout);
 
 //setLongClickable Is a must 
 view.setLongClickable(true);
 view.setOnTouchListener(new MyGestureListener(this));
 }
 
 /**
 *  inheritance GestureListener , the rewrite left and right methods 
 */
 private class MyGestureListener extends GestureListener {
 public MyGestureListener(Context context) {
  super(context);
 }

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

 @Override
 public boolean right() {
  Log.e("test", " Slide to the right ");
  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;

/**
 *  Implementation listens for left and right sliding events, which one view Be direct when needed setOnTouchListener It's ready to go 
 * @author LinZhiquan
 *
 */
public class GestureListener extends SimpleOnGestureListener implements OnTouchListener {
 /**  The shortest distance to slide left or right  */
 private int distance = 100;
 /**  Maximum speed of left and right sliding  */
 private int velocity = 200;
 
 private GestureDetector gestureDetector;
 
 public GestureListener(Context context) {
 super();
 gestureDetector = new GestureDetector(context, this);
 }

 /**
 *  Methods that are called when you slide to the left should be overridden by subclasses 
 * @return
 */
 public boolean left() {
 return false;
 }
 
 /**
 *  Methods that are called when you slide to the right should be overridden by subclasses 
 * @return
 */
 public boolean right() {
 return false;
 }
 
 @Override
 public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
  float velocityY) {
 // TODO Auto-generated method stub
 // e1 : the first 1 a ACTION_DOWN MotionEvent
 // e2 : the last 1 a ACTION_MOVE MotionEvent
 // velocityX : X The speed of movement on the axis (pixels) / A second) 
 // velocityY : Y The speed of movement on the axis (pixels) / A second) 

 //  The left slide 
 if (e1.getX() - e2.getX() > distance
  && Math.abs(velocityX) > velocity) {
  left();
 }
 //  Slide to the right 
 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;
 }
}