Android笔记之监听左右滑动事件

package com.example.movetest;

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

public class MainActivity extends Activity {

private GestureDetector mGestureDetector;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mGestureDetector = new GestureDetector(this, new MyGestureListener());
}

public boolean onTouchEvent(MotionEvent event) {
return mGestureDetector.onTouchEvent(event);
}

class MyGestureListener extends GestureDetector.SimpleOnGestureListener {
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
if (e1.getX() - e2.getX() > 20) {
Log.i("MainActivity", "To Left");
}
if (e2.getX() - e1.getX() > 20) {
Log.i("MainActivity", "To Right");
}
return true;
}
}
}