Android使用ViewFlipper实现图片切换功能

<?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"
 tools:context="com.example.android21_zhangkai_gesture.MainActivity">

 <ViewFlipper
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:id="@+id/vf_main_image"
  ></ViewFlipper>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
 android:fillAfter="true"
 android:duration="1000"
 >
 <translate
  android:fromXDelta="-100%p"
  android:toXDelta="0"
  ></translate>

 <rotate
  android:fromDegrees="0"
  android:toDegrees="360"
  android:pivotX="50%"
  android:pivotY="50%"
  ></rotate>
</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
 android:fillAfter="true"
 android:duration="1000"
 >
 <translate
  android:fromXDelta="0"
  android:toXDelta="-100%p"
  ></translate>

 <rotate
  android:fromDegrees="0"
  android:toDegrees="-360"
  android:pivotX="50%"
  android:pivotY="50%"
  ></rotate>

</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
 android:fillAfter="true"
 android:duration="1000"
 >
 <translate
  android:fromXDelta="100%p"
  android:toXDelta="0"
  ></translate>

 <rotate
  android:fromDegrees="0"
  android:toDegrees="-360"
  android:pivotX="50%"
  android:pivotY="50%"
  ></rotate>
</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
 android:fillAfter="true"
 android:duration="1000"
 >
 <translate
  android:fromXDelta="0"
  android:toXDelta="100%p"
  ></translate>

 <rotate
  android:fromDegrees="0"
  android:toDegrees="360"
  android:pivotX="50%"
  android:pivotY="50%"
  ></rotate>
</set>

package com.example.android21_zhangkai_gesture;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.ViewFlipper;

public class MainActivity extends AppCompatActivity {

 private ViewFlipper vf_main_image;
 private int images[]={R.mipmap.ic_launcher,R.mipmap.ic_launcher_round};
 private GestureDetector gd;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  vf_main_image = (ViewFlipper) findViewById(R.id.vf_main_image);
  for (int i = 0; i < images.length; i++) {
   ImageView iv=new ImageView(this);
   iv.setImageResource(images[i]);
   vf_main_image.addView(iv);
  }

  //实例化手势检测器类
  gd = new GestureDetector(this, new GestureDetector.OnGestureListener() {
   //按下
   @Override
   public boolean onDown(MotionEvent e) {
    Log.i("test","onDown");
    return false;
   }

   //按下，但是手指还未抬起时调用此方法
   @Override
   public void onShowPress(MotionEvent e) {
    Log.i("test","onShowPress");
   }
   //轻按，按一下，立刻抬起
   @Override
   public boolean onSingleTapUp(MotionEvent e) {
    Log.i("test","onSingleTapUp");
    return false;
   }
   //滚动
   @Override
   public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
    Log.i("test","onScroll");
    return false;
   }
   //长按
   @Override
   public void onLongPress(MotionEvent e) {
    Log.i("test","onLongPress");

   }
   //拖动

   /**
    *
    * @param e1 手指开始滑动时的位置
    * @param e2 手指开始滑动时的位置
    * @param velocityX
    * @param velocityY
    * @return
    */
   @Override
   public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
    Log.i("test","onFling");
    //向右滑，获取手指结束滑动时的X坐标-手指开始滑动时的X坐标，如果大于200，则换图片
    if (e2.getX()-e1.getX()>200){
     Toast.makeText(MainActivity.this, "右滑,上一张", Toast.LENGTH_SHORT).show();
     vf_main_image.showPrevious();//上一张的方法
     //动画为当前图片从右出去，新图从左进来
     vf_main_image.setInAnimation(MainActivity.this,R.anim.left_in);//设置进来的动画
     vf_main_image.setOutAnimation(MainActivity.this,R.anim.right_out);//设置出去的动画
    }else if(e1.getX()-e2.getX()>200){
     Toast.makeText(MainActivity.this, "左滑,下一张", Toast.LENGTH_SHORT).show();
     vf_main_image.showNext();
     //动画为当前图片从左出去，新图从右进来
     vf_main_image.setInAnimation(MainActivity.this,R.anim.right_in);
     vf_main_image.setOutAnimation(MainActivity.this,R.anim.left_out);
    }
    return false;
   }
  });
 }

 //给当前Activity设置触摸事件监听方法
 @Override
 public boolean onTouchEvent(MotionEvent event) {
  return gd.onTouchEvent(event);
 }
}