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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：

1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  2     xmlns:tools="http://schemas.android.com/tools"  3     android:layout_width="match_parent"  4     android:layout_height="match_parent" >  5   6     <android.support.v4.view.ViewPager  7         android:id="@+id/viewPager"  8         android:layout_width="match_parent"  9         android:layout_height="match_parent" > 10     </android.support.v4.view.ViewPager> 11  12 </RelativeLayout>

MainActivity.java：

1 package com.zzw.tetsphotoview;  2   3 import java.util.ArrayList;  4 import java.util.List;  5   6 import uk.co.senab.photoview.PhotoViewAttacher;  7   8 import android.app.Activity;  9 import android.content.Context; 10 import android.os.Bundle; 11 import android.os.Handler; 12 import android.os.Message; 13 import android.support.v4.view.PagerAdapter; 14 import android.support.v4.view.ViewPager; 15 import android.view.View; 16 import android.view.ViewGroup; 17 import android.widget.ImageView; 18  19 public class MainActivity extends Activity { 20     ViewPager mViewPager; 21     List<ImageView> imageViews; 22  23     @Override 24     protected void onCreate(Bundle savedInstanceState) { 25         super.onCreate(savedInstanceState); 26         setContentView(R.layout.activity_main); 27         mViewPager = (ViewPager) findViewById(R.id.viewPager); 28         mViewPager.setAdapter(new ImageAdapter(this)); 29     } 30  31     class ImageAdapter extends PagerAdapter { 32         Context context; 33         int[] images; 34  35         public void init() { 36             imageViews = new ArrayList<ImageView>(); 37             images = new int[] { R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d }; 38             for (int i = 0; i < images.length; i++) { 39                 ImageView image = new ImageView(context); 40                 image.setImageResource(images[i]); 41                  42                 //使图片实现可以放大缩小的功能 43                 PhotoViewAttacher mAttacher=new PhotoViewAttacher(image); 44                  45                  46                 imageViews.add(image); 47             48              49             } 50 //            for (int i : images) { 51 //                ImageView image = new ImageView(context); 52 //                image.setImageResource(i); 53 //                imageViews.add(image); 54 //             } 55         } 56  57         public ImageAdapter(Context context) { 58             this.context = context; 59             init(); 60         } 61  62         @Override 63         public void destroyItem(ViewGroup container, int position, Object object) { 64             container.removeView(imageViews.get(position)); 65         } 66  67         @Override 68         public View instantiateItem(ViewGroup container, int position) { 69             container.addView(imageViews.get(position)); 70  71             return imageViews.get(position); 72         } 73  74         @Override 75         public int getCount() { 76             return imageViews.size(); 77         } 78  79         @Override 80         public boolean isViewFromObject(View arg0, Object arg1) { 81             return arg0 == arg1; 82         } 83  84     } 85  86 }

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