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); }}