图片放大缩小（和ViewPager配合使用流畅显示）--第三方开源--PhotoView

图片的放大缩小实现效果是使用的github上的一个开源项目photoView实现的,下载地址：https://github.com/chrisbanes/PhotoView

下面看测试代码：

activity_main.xml：

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent" >

     <android.support.v4.view.ViewPager
         android:id="@+id/viewPager"
         android:layout_width="match_parent"
         android:layout_height="match_parent" >
     </android.support.v4.view.ViewPager>

 </RelativeLayout>

MainActivity.java：

 package com.zzw.tetsphotoview;

 import java.util.ArrayList;
 import java.util.List;

 import uk.co.senab.photoview.PhotoViewAttacher;

 import android.app.Activity;
 import android.content.Context;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.support.v4.view.PagerAdapter;
 import android.support.v4.view.ViewPager;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;

 public class MainActivity extends Activity {
     ViewPager mViewPager;
     List<ImageView> imageViews;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         mViewPager = (ViewPager) findViewById(R.id.viewPager);
         mViewPager.setAdapter(new ImageAdapter(this));
     }

     class ImageAdapter extends PagerAdapter {
         Context context;
         int[] images;

         public void init() {
             imageViews = new ArrayList<ImageView>();
             images = new int[] { R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d };
             for (int i = 0; i < images.length; i++) {
                 ImageView image = new ImageView(context);
                 image.setImageResource(images[i]);

                 //使图片实现可以放大缩小的功能
                 PhotoViewAttacher mAttacher=new PhotoViewAttacher(image);
                 

                 imageViews.add(image);

             }
 //            for (int i : images) {
 //                ImageView image = new ImageView(context);
 //                image.setImageResource(i);
 //                imageViews.add(image);
 //             }
         }

         public ImageAdapter(Context context) {
             this.context = context;
             init();
         }

         @Override
         public void destroyItem(ViewGroup container, int position, Object object) {
             container.removeView(imageViews.get(position));
         }

         @Override
         public View instantiateItem(ViewGroup container, int position) {
             container.addView(imageViews.get(position));

             return imageViews.get(position);
         }

         @Override
         public int getCount() {
             return imageViews.size();
         }

         @Override
         public boolean isViewFromObject(View arg0, Object arg1) {
             return arg0 == arg1;
         }

     }

 }