使用photoview+viewpager实现图片缩放切换（类似微信朋友圈图片查看）

首先看一下最终效果

经过分析可知，整个页面布局应该是一个Listview，它的每一个条目item中包含原型头像（采用CircleImageVIew）一个数目可变的GridView和其他，Gridview不可滚动，图片查看可缩放使用photoview，图片切换使用viewpager，思路清晰之后，开始写。。。

导入依赖库：

compile 'com.google.code.gson:gson:2.2.4'
compile files('libs/circleimageview.jar')
compile files('libs/universal-image-loader-1.9.1.jar')

导入photoview源码https://github.com/chrisbanes/PhotoView

初始化ImageLoader

public class MyApplication extends Application {

   @Override
   public void onCreate() {
      super.onCreate();
      DisplayImageOptions defaultOptions = new DisplayImageOptions
            .Builder()
            .showImageForEmptyUri(R.drawable.empty_photo) 
            .showImageOnFail(R.drawable.empty_photo) 
            .cacheInMemory(true)
            .cacheOnDisc(true)
            .build();
      ImageLoaderConfiguration config = new ImageLoaderConfiguration
            .Builder(getApplicationContext())
            .defaultDisplayImageOptions(defaultOptions)
            .discCacheSize(50 * 1024 * 1024)//
            .discCacheFileCount(100)//缓存一百张图片
            .writeDebugLogs()
            .build();
      ImageLoader.getInstance().init(config);
   }
}

清单文件中修改

1.MainActivity

public class MainActivity extends ListActivity {

   public static final String TAG = "MainActivity";
   private ListAdapter mAdapter;

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

      //开启异步任务去模拟获取数据
      new LoderDataTask().execute();

   }

   class LoderDataTask extends AsyncTask, Void, MessageModle> {

      @Override
      protected MessageModle doInBackground(Void... params) {

         Gson gson = new Gson();

         MessageModle msg = gson.fromJson(getData(), MessageModle.class);
         return msg;
      }

      @Override
      protected void onPostExecute(MessageModle result) {
         mAdapter = new ListAdapter(MainActivity.this, result.list);
         setListAdapter(mAdapter);

      }

   }

   private String getData() {
      // 模拟网络获取数据
      String json = "{\"code\":200,\"msg\":\"ok\",list:["
            + "{\"id\":110,\"avator\":\"http://img0.bdstatic.com/img/image/shouye/leimu/mingxing.jpg\",\"name\":\"赵薇\",\"content\":\"今天不开心!\",\"urls\":[]},"
            + "{\"id\":111,\"avator\":\"http://image.cnwest.com/attachement/jpg/site1/20110507/001372d8a36f0f2f4c953a.jpg\",\"name\":\"李晨\",\"content\":\"我们\","
            + "  \"urls\":[\"http://guangdong.sinaimg.cn/2015/0530/U11307P693DT20150530094310.jpg\"]},"

            + "{\"id\":114,\"avator\":\"http://img.hexun.com/2009-05-01/117287830.jpg\",\"name\":\"小马哥\",\"content\":\"今天淘宝了吗\",\"urls\":["
            + "\"http://g.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=ccd33b46d53f8794d7ff4b26e2207fc9/0d338744ebf81a4c0f993437d62a6059242da6a1.jpg\","
            
            + "\"http://f.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=6b62f61bac6eddc422e7b7f309e0c7c0/6159252dd42a2834510deef55ab5c9ea14cebfa1.jpg\","
            + "\"http://g.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=e58fb67bc8ea15ce45eee301863b4bce/a5c27d1ed21b0ef4fd6140a0dcc451da80cb3e47.jpg\","
            + "\"http://c.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=cdab1512d000baa1be2c44b3772bc82f/91529822720e0cf3855c96050b46f21fbf09aaa1.jpg\"]},"
            
            + "{\"id\":112,\"avator\":\"http://img3.yxlady.com/yl/UploadFiles_5361/20150528/20150528050208705.jpg\",\"name\":\"邓超\",\"content\":\"奔跑吧兄弟！ 欢迎收看！\",\"urls\":[\"http://upload.cbg.cn/2015/0305/1425518659246.jpg\","
            + "\"http://www.people.com.cn/mediafile/pic/20150619/30/4179219540177204330.jpg\"]},"
            
            + "{\"id\":113,\"avator\":\"http://img4.imgtn.bdimg.com/it/u=945108765,1070109457&fm=21&gp=0.jpg\",\"name\":\"奥巴马\",\"content\":\"holle\",\"urls\":[\"http://f.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=6b62f61bac6eddc422e7b7f309e0c7c0/6159252dd42a2834510deef55ab5c9ea14cebfa1.jpg\",\"http://g.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=e58fb67bc8ea15ce45eee301863b4bce/a5c27d1ed21b0ef4fd6140a0dcc451da80cb3e47.jpg\",\"http://c.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=cdab1512d000baa1be2c44b3772bc82f/91529822720e0cf3855c96050b46f21fbf09aaa1.jpg\"]}]}";

      return json;
   }
}

bean类

public class MessageModle {

   public int code;
   public String msg;
   
   public ArrayList list;

   @Override
   public String toString() {
      return "MyMessage [code=" + code + ", msg=" + msg + ", list=" + list + "]";
   }

   
   
}

public class InfoBean {

   public int id;
   public String avator;
   public String name;
   public String content;
   public String time;
   public String[] urls;

   

}

布局文件

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:padding="6dp" >

            android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

            android:id="@android:id/empty"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="暂无数据" />

2.ListAdapter

public class ListAdapter extends BaseAdapter{

   private ArrayList mList;
   private LayoutInflater mInflater;
   private Context mContext;
   
   public ListAdapter(Context context, ArrayList list) {
      mInflater = LayoutInflater.from(context);
      mContext=context;
      this.mList=list;
   }

   @Override
   public int getCount() {
      return mList==null?0:mList.size();
   }

   @Override
   public InfoBean getItem(int position) {
      return mList.get(position);
   }

   @Override
   public long getItemId(int position) {
      return getItem(position).id;
   }

   @Override
   public View getView(int position, View convertView, ViewGroup parent) {
      ViewHolder holder;
      if (convertView == null) {
         holder = new ViewHolder();
         convertView = mInflater.inflate(R.layout.list_item, null);
         holder.avator=(ImageView)convertView.findViewById(R.id.avator);
         holder.name=(TextView)convertView.findViewById(R.id.name);
         holder.content = (TextView) convertView.findViewById(R.id.content);
         holder.gridView=(NoScrollGridView)convertView.findViewById(R.id.gridView);
         convertView.setTag(holder);
      } else {
         holder = (ViewHolder) convertView.getTag();
      }
      final InfoBean bean = getItem(position);
      //加载网络图片
      ImageLoader.getInstance().displayImage(bean.avator, holder.avator);
      holder.name.setText(bean.name);
      holder.content.setText(bean.content);
      if(bean.urls!=null&&bean.urls.length>0){
         holder.gridView.setVisibility(View.VISIBLE);
         holder.gridView.setAdapter(new DynamicGridAdapter(bean.urls, mContext));
         holder.gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView parent, View view, int position, long id) {
               imageBrower(position,bean.urls);
            }
         });
      }else{
         holder.gridView.setVisibility(View.GONE);
      }
      return convertView;
   }

   private void imageBrower(int position, String[] urls) {
      Intent intent = new Intent(mContext, ImagePagerActivity.class);
      // 图片url,为了演示这里使用常量，一般从数据库中或网络中获取
      intent.putExtra(ImagePagerActivity.EXTRA_IMAGE_URLS, urls);
      intent.putExtra(ImagePagerActivity.EXTRA_IMAGE_INDEX, position);
      mContext.startActivity(intent);
   }
   
   // 优化listview
   private static class ViewHolder {

      public TextView name;
      public ImageView avator;
      TextView content;
      NoScrollGridView gridView;
   }
}

DynamicGridAdapter

public class DynamicGridAdapter extends BaseAdapter {
   private String[] files;

   private LayoutInflater mLayoutInflater;

   public DynamicGridAdapter(String[] files, Context context) {
      this.files = files;
      mLayoutInflater = LayoutInflater.from(context);
   }

   @Override
   public int getCount() {
      return files == null ? 0 : files.length;
   }

   @Override
   public String getItem(int position) {
      return files[position];
   }

   @Override
   public long getItemId(int position) {
      return position;
   }

   @Override
   public View getView(int position, View convertView, ViewGroup parent) {
      MyGridViewHolder viewHolder;
      if (convertView == null) {
         viewHolder = new MyGridViewHolder();
         convertView = mLayoutInflater.inflate(R.layout.gridview_item,
               parent, false);
         
         viewHolder.imageView = (ImageView) convertView
               .findViewById(R.id.album_image);
         convertView.setTag(viewHolder);
      } else {
         viewHolder = (MyGridViewHolder) convertView.getTag();
      }
      String url = getItem(position);
      if (getCount() == 1) {
         viewHolder.imageView.setLayoutParams(new android.widget.AbsListView.LayoutParams(300, 250));
      }
      
      if (getCount() == 2 ||getCount() == 4) {
         viewHolder.imageView.setLayoutParams(new android.widget.AbsListView.LayoutParams(200, 200));
      }

      ImageLoader.getInstance().displayImage(url, viewHolder.imageView);

      return convertView;
   }

   private static class MyGridViewHolder {
      ImageView imageView;
   }
}

布局文件

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:padding="6dp" >

            android:id="@+id/avator"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:src="@drawable/empty_photo" />

            android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_toRightOf="@id/avator"
        android:textColor="#576B95"
        android:textSize="16sp"
        android:text="name" />

            android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/name"
        android:layout_marginLeft="10dp"
        android:textSize="12sp"
        android:layout_toRightOf="@id/avator"
        android:text="content" />

            
        android:id="@+id/gridView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingTop="5dp"
        android:layout_below="@id/content"
        android:layout_marginLeft="10dp"
        android:layout_toRightOf="@id/avator"
        android:horizontalSpacing="1dp"
        android:numColumns="3"
        
        android:visibility="gone"
        android:verticalSpacing="1dp" />

3.自定义无滚动的GridView

public class NoScrollGridView extends GridView {

   public NoScrollGridView(Context context) {
      super(context);
   }

   public NoScrollGridView(Context context, AttributeSet attrs) {
      super(context, attrs);
   }
   
   @Override
   protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
      int  expandSpec = 0;
       int  size = getAdapter().getCount();
       
      if (size == 1) {
         
         setNumColumns(1);
      } 
      if ( size==2 || size == 4  ) {
         setNumColumns(2);
      }
      else {
         setNumColumns(3);
      }
      expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,MeasureSpec.AT_MOST);
      super.onMeasure(widthMeasureSpec,expandSpec);
   }

}

4.图片查看Activiy

public class ImagePagerActivity extends FragmentActivity {
   private static final String STATE_POSITION = "STATE_POSITION";
   public static final String EXTRA_IMAGE_INDEX = "image_index";
   public static final String EXTRA_IMAGE_URLS = "image_urls";

   private HackyViewPager mPager;
   private int pagerPosition;
   private TextView indicator;

   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.image_detail_pager);

      pagerPosition = getIntent().getIntExtra(EXTRA_IMAGE_INDEX, 0);
      String[] urls = getIntent().getStringArrayExtra(EXTRA_IMAGE_URLS);


      mPager = (HackyViewPager) findViewById(R.id.pager);
      ImagePagerAdapter mAdapter = new ImagePagerAdapter(
            getSupportFragmentManager(), urls);
      mPager.setAdapter(mAdapter);
      indicator = (TextView) findViewById(R.id.indicator);

      CharSequence text = getString(R.string.viewpager_indicator, 1, mPager
            .getAdapter().getCount());
      indicator.setText(text);
      // 更新下标
      mPager.setOnPageChangeListener(new OnPageChangeListener() {

         @Override
         public void onPageScrollStateChanged(int arg0) {
         }

         @Override
         public void onPageScrolled(int arg0, float arg1, int arg2) {
         }

         @Override
         public void onPageSelected(int arg0) {
            CharSequence text = getString(R.string.viewpager_indicator,
                  arg0 + 1, mPager.getAdapter().getCount());
            indicator.setText(text);
         }

      });
      if (savedInstanceState != null) {
         pagerPosition = savedInstanceState.getInt(STATE_POSITION);
      }

      mPager.setCurrentItem(pagerPosition);
   }

   @Override
   public void onSaveInstanceState(Bundle outState) {
      outState.putInt(STATE_POSITION, mPager.getCurrentItem());
   }

   private class ImagePagerAdapter extends FragmentStatePagerAdapter {

      public String[] fileList;

      public ImagePagerAdapter(FragmentManager fm, String[] fileList) {
         super(fm);
         this.fileList = fileList;
      }

      @Override
      public int getCount() {
         return fileList == null ? 0 : fileList.length;
      }

      @Override
      public Fragment getItem(int position) {
         String url = fileList[position];
         return ImageDetailFragment.newInstance(url);
      }

   }
}

viewpager

public class HackyViewPager extends ViewPager {


   private static final String TAG = "HackyViewPager";

   public HackyViewPager(Context context) {
      super(context);
   }
   
   public HackyViewPager(Context context, AttributeSet attrs) {
      super(context, attrs);
   }

   @Override
   public boolean onInterceptTouchEvent(MotionEvent ev) {
      try {
         return super.onInterceptTouchEvent(ev);
      } catch (IllegalArgumentException e) {
      
         return false;
      }catch(ArrayIndexOutOfBoundsException e ){
         
         return false;
      }
   }

}

布局文件

xml version="1.0" encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

            android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/black" />

            android:id="@+id/indicator"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:gravity="center"
        android:textSize="18sp"
        android:textColor="@android:color/white"
        android:text="@string/viewpager_indicator"
        android:background="@android:color/transparent" />

5.图片显示Fragment

public class ImageDetailFragment extends Fragment {
   private String mImageUrl;
   private ImageView mImageView;
   private ProgressBar progressBar;
   private PhotoViewAttacher mAttacher;

   public static ImageDetailFragment newInstance(String imageUrl) {
      final ImageDetailFragment f = new ImageDetailFragment();

      final Bundle args = new Bundle();
      args.putString("url", imageUrl);
      f.setArguments(args);

      return f;
   }

   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      mImageUrl = getArguments() != null ? getArguments().getString("url") : null;

   }

   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      final View v = inflater.inflate(R.layout.image_detail_fragment, container, false);
      mImageView = (ImageView) v.findViewById(R.id.image);
      mAttacher = new PhotoViewAttacher(mImageView);
      
      mAttacher.setOnPhotoTapListener(new OnPhotoTapListener() {

         //点击图片关闭当前activiy
         @Override
         public void onPhotoTap(View arg0, float arg1, float arg2) {
            getActivity().finish();
         }
      });
      
      progressBar = (ProgressBar) v.findViewById(R.id.loading);
      return v;
   }

   @Override
   public void onActivityCreated(Bundle savedInstanceState) {
      super.onActivityCreated(savedInstanceState);
      
      
      ImageLoader.getInstance().displayImage(mImageUrl, mImageView, new SimpleImageLoadingListener() {
         @Override
         public void onLoadingStarted(String imageUri, View view) {
            progressBar.setVisibility(View.VISIBLE);
         }

         @Override
         public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
            String message = null;
            switch (failReason.getType()) {
            case IO_ERROR:
               message = "下载错误";
               break;
            case DECODING_ERROR:
               message = "图片无法显示";
               break;
            case NETWORK_DENIED:
               message = "网络有问题，无法下载";
               break;
            case OUT_OF_MEMORY:
               message = "图片太大无法显示";
               break;
            case UNKNOWN:
               message = "未知的错误";
               break;
            }
            Toast.makeText(getActivity(), message, Toast.LENGTH_SHORT).show();
            progressBar.setVisibility(View.GONE);
         }

         @Override
         public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
            progressBar.setVisibility(View.GONE);
            mAttacher.update();
         }
      });
      
   }

}

布局文件

xml version="1.0" encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:background="@color/black"
    android:layout_height="match_parent" >

            android:id="@+id/image"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:adjustViewBounds="true"
        android:contentDescription="@string/app_name"
        android:scaleType="centerCrop" />

            android:id="@+id/loading"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:visibility="gone" />