//圖片手勢放大

    第一個ImageViewTouch 只支援圖片放大和縮小位置不會變動    compile 'it.sephiroth.android.library.imagezoom:imagezoom:+'

    第二個PhotoView 可以拖動 縮放 圖片旋轉 但是無法設定圖片預設大小compile 'com.bm.photoview:library:1.4.1'

  在ViewPager中的程式碼  程式碼不多自己看

**
 * Created by Administrator on 2016/10/17.
 */public class ImagePagerAdapter extends 
 
PagerAdapter {
    List<String> imageUrls;
Activity context;
    private ImageView imageView;
    public ImagePagerAdapter(Context context, List<String> imageUrls) {
        this.context = (Activity) context;
        this.imageUrls = imageUrls;
}

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

    @Override
public boolean isViewFromObject(View view, Object object) {

        return view == object;
}

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

    @Override
public Object instantiateItem
 
(ViewGroup container, int position) {
//        imageView = new ImageView(context);
        //不帶旋轉只能縮放不帶回彈
//        imageView = new ImageViewTouch(context,null);
//        PhotoView photoView = new PhotoView(context);
        // 啟用圖片縮放功能
//        photoView.enable();LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.big_image_layout, null);
//可以旋轉圖片，可以縮放圖片，有彈性
PhotoView photoView = (PhotoView) view.findViewById(R.id.big_image_photoview);
photoView.enable();
ImageLoader.getInstance().displayImage(imageUrls.get(position), photoView);
//        Picasso.with(context).load(imageUrls.get(position)).into(imageView);
container.addView(photoView);
photoView.setOnClickListener(new View.OnClickListener() {
            @Override
public void onClick(View view) {
                context.finish();
}
        });
        return photoView;
}
}