Android实现页面翻转和自动翻转功能

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 tools:context=".slide.Main2Activity">
 <LinearLayout
  android:layout_width="match_parent"
  android:layout_height="wrap_content">
  <Button
   android:layout_width="0dp"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:onClick="start"
   android:text="开始自动翻页" />
  <Button
   android:layout_width="0dp"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:onClick="stop"
   android:text="停止自动翻页" />
 </LinearLayout>
 <ViewFlipper
  android:id="@+id/activity_main2_vf"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:flipInterval="1500"></ViewFlipper> //flipInterval 实现自动翻转时添加，值为每页翻转的时间
</LinearLayout>

package com.example.mygesture.slide;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.ViewFlipper;
import com.example.mygesture.R;
public class Main2Activity extends AppCompatActivity implements GestureDetector.OnGestureListener { //实现手势检测器接口
 GestureDetector gestureDetector; //定义手势检测器
 ViewFlipper viewFlipper;  
// Animation[] animations=new Animation[4]; //注释的部分为添加动画效果
 int distance=50;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main2);
  init();
 }
 private void init() {
  gestureDetector = new GestureDetector(this, this);//实例化GestureDetector
  viewFlipper=findViewById(R.id.activity_main2_vf);
  viewFlipper.addView(addImageView(R.drawable.q1));//添加图片
  viewFlipper.addView(addImageView(R.drawable.q2));
  viewFlipper.addView(addImageView(R.drawable.q3));
  viewFlipper.addView(addImageView(R.drawable.q4));
//  animations[0]=AnimationUtils.loadAnimation(this,R.anim.left_in);
//  animations[1]=AnimationUtils.loadAnimation(this,R.anim.left_out);
//  animations[2]=AnimationUtils.loadAnimation(this,R.anim.right_in);
//  animations[3]=AnimationUtils.loadAnimation(this,R.anim.right_out);
 }
 private View addImageView(int resId) {
  ImageView imageView=new ImageView(this);
  imageView.setImageResource(resId);
  imageView.setScaleType(ImageView.ScaleType.CENTER);
  return imageView;
 }
 @Override
 public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
  viewFlipper.stopFlipping();  //当滑动时停止自动翻转
  if (e1.getX()-e2.getX()>distance){  //当从右向左滑动时
//   viewFlipper.setInAnimation(animations[0]); 
//   viewFlipper.setOutAnimation(animations[1]);
   viewFlipper.showPrevious();  //返回上一张视图
   return true;
  }if (e2.getX()-e1.getX()>distance){  //当从左向右滑动时
//   viewFlipper.setInAnimation(animations[2]);
//   viewFlipper.setOutAnimation(animations[3]);
   viewFlipper.showNext();  //切换下一张视图
   return true;
  }
  return false;
 }
 @Override
 public boolean onTouchEvent(MotionEvent event) {
  return gestureDetector.onTouchEvent(event); //绑定触摸事件
 }
 public void start(View view) {
  viewFlipper.startFlipping();  //开始自动翻转，与flipInterval配套使用，缺一不可 
 }
 public void stop(View view) {
  viewFlipper.stopFlipping();  //停止自动翻转 
 }
 @Override
 public boolean onDown(MotionEvent e) {
  return false;
 }
 @Override
 public void onShowPress(MotionEvent e) {
 }
 @Override
 public boolean onSingleTapUp(MotionEvent e) {
  return false;
 }
 @Override
 public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
  return false;
 }
 @Override
 public void onLongPress(MotionEvent e) {
 }
}