显示大图Activity（支持手势放大）

xml:

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

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

</RelativeLayout>

　　

java类：

public class ActShowBigPicture extends BaseActivity implements ZoomImageView.onImageTouchedListener {
   /** 图片url集合 intent key */
   public static final String INTENT_PICURLS = "picUrls";
   /** 显示下标 intent key */
   public static final String INTENT_SHOW_POS = "showPos";

   private List<String> picUrls; // 图片URL集合
   private int showPos; // 显示下标
   private int oldPosition = 0;

   private ViewPager picViewPager;

   private List<View> zoomImageViewContainers;
   private List<ZoomImageView> zoomImageViews;
   private DisplayImageOptions mPicOptions;

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

      mBar.setVisibility(View.GONE);

      dismissLoadingView();

      // 获取传递过来的Intent对象
      Intent intent = getIntent();
      picUrls = intent.getStringArrayListExtra(INTENT_PICURLS);
      showPos = intent.getIntExtra(INTENT_SHOW_POS, 0);

      if (null == picUrls || picUrls.size() <= 0) {
         finish();
         return ;
      }

      mPicOptions = new DisplayImageOptions.Builder()
            .showImageOnLoading(R.drawable.def_banner_img)
            .showImageOnFail(R.drawable.def_banner_img)
            .showImageForEmptyUri(R.drawable.def_banner_img)
            .cacheOnDisk(true)
            .cacheInMemory(false)
            .displayer(new FadeInBitmapDisplayer(200, true, true, false)) // 显示动画
            .build();

      // 初始化View
      picViewPager = (ViewPager)findViewById(R.id.picViewPager);

      // 设置事件
//    findViewById(R.id.layout_back).setOnClickListener(this);

      zoomImageViews = new ArrayList<>();
      zoomImageViewContainers = new ArrayList<>();
      for (int i=0; i<picUrls.size(); i++) {
         View zoomImageViewContainer = getLayoutInflater().inflate(R.layout.item_big_picture, null);
         ZoomImageView zommImageView = (ZoomImageView)zoomImageViewContainer.findViewById(R.id.zommImageView);
         zommImageView.setOnImageTouchedListener(this);
         zommImageView.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
               ZoomImageView curZoomImageView = (ZoomImageView)v;
               Bitmap tempImageBitmap = curZoomImageView.getImageBitmap();
               if (null == tempImageBitmap) { 
                  return false;
               }

               int curW = tempImageBitmap.getWidth();
               int curH = tempImageBitmap.getWidth();

               Matrix m = curZoomImageView.getImageViewMatrix();
               RectF rect = new RectF(0, 0, curW, curH);
               m.mapRect(rect);  
               // 图片超出屏幕范围后移动
//             Log.i("wg", "rect.right= " + rect.right + " _ rect.left = " + rect.left);
               if (!(rect.right > curZoomImageView.getWidth() + 0.1 && rect.left < -0.1)) {
                  picViewPager.requestDisallowInterceptTouchEvent(false);
               } else {
                  picViewPager.requestDisallowInterceptTouchEvent(true);
               }

               return false;
            }
         });

         zoomImageViewContainers.add(zoomImageViewContainer);
         zoomImageViews.add(zommImageView);
      }

      // 设置图片间的间距
//    final float scale = getResources().getDisplayMetrics().density;
//    int pagerMarginPixels = (int) (PAGER_MARGIN_DP * scale + 0.5f);
//    picViewPager.setPageMargin(pagerMarginPixels);
//    picViewPager.setPageMarginDrawable(new ColorDrawable(Color.BLACK));
      // 设置适配器
      picViewPager.setAdapter(new PagerAdapter() {
         @Override
         public void destroyItem(View arg0, int arg1, Object arg2) {
            ((ViewPager)arg0).removeView(zoomImageViewContainers.get(arg1));
         }

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

         @Override
         public Object instantiateItem(View arg0, int arg1) {
            View v = zoomImageViewContainers.get(arg1);
            ((ViewPager) arg0).addView(v, 0);
            return v;
         }

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

         @Override
         public void restoreState(Parcelable arg0, ClassLoader arg1) {
         }

         @Override
         public Parcelable saveState() {
            return null;
         }

         @Override
         public void startUpdate(View arg0) {
         }
      });
      picViewPager.setOnPageChangeListener(new SimpleOnPageChangeListener() {
         @Override
         public void onPageSelected(int position) {
            // 恢复原图最小化
            ZoomImageView oldImageViewTouch = zoomImageViews.get(oldPosition);
            if (null != oldImageViewTouch && null != oldImageViewTouch.getImageBitmap() && !oldImageViewTouch.getImageBitmap().isRecycled()) {
               oldImageViewTouch.zoomTo(oldImageViewTouch.zoomDefault());
            }

            ZoomImageView curImageViewTouch = zoomImageViews.get(position);
            Bitmap curImageBitmap = curImageViewTouch.getImageBitmap();
            // 当图片Bitmap为空或者已经被回收的时候才去加载
            if (null == curImageBitmap || curImageBitmap.isRecycled()) {
               loadImageViewBitmap(picUrls.get(position), curImageViewTouch, null);
            }

            oldPosition = position;
         }   
      });

      picViewPager.setCurrentItem(showPos, false);
      if (showPos == 0) {
         // 显示第一张图片
         // 显示Loading
         ImageLoader.getInstance().displayImage(picUrls.get(0), zoomImageViews.get(0), mPicOptions, new SimpleImageLoadingListener(){
            @Override
            public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
               super.onLoadingComplete(imageUri, view, loadedImage);

//             ((FrameLayout)zoomImageViews.get(0).getParent()).findViewById(R.id.pagerLoad).setVisibility(View.GONE);
            }

            @Override
            public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
               super.onLoadingFailed(imageUri, view, failReason);

               // 隐藏Loading
//             ((FrameLayout)zoomImageViews.get(0).getParent()).findViewById(R.id.pagerLoad).setVisibility(View.GONE);

               // 显示loading错误View
//             ((FrameLayout)zoomImageViews.get(0).getParent()).findViewById(R.id.loaddataErrRL).setVisibility(View.VISIBLE);
            }
         });
      }
   }

   private void loadImageViewBitmap(final String picUrl, final ImageView iv, final View parentView) {
      if (null != parentView) {
         // 显示Loading
//       parentView.findViewById(R.id.pagerLoad).setVisibility(View.VISIBLE);
      }

      ImageLoader.getInstance().displayImage(picUrl, iv, mPicOptions, new SimpleImageLoadingListener() {
         @Override
         public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
            super.onLoadingFailed(imageUri, view, failReason);

            // 获取父View
//          final FrameLayout parentView = (FrameLayout)iv.getParent();

            // 隐藏Loading
//          parentView.findViewById(R.id.pagerLoad).setVisibility(View.GONE);

            // 显示loading错误View
//          parentView.findViewById(R.id.loaddataErrRL).setVisibility(View.VISIBLE);
         }

         @Override
         public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
            super.onLoadingComplete(imageUri, view, loadedImage);

            // 获取父View
//          final FrameLayout parentView = (FrameLayout)iv.getParent();

            if (null == loadedImage) {
               // 显示loading错误View
//             parentView.findViewById(R.id.loaddataErrRL).setVisibility(View.VISIBLE);
            }

            // 隐藏Loading
//          parentView.findViewById(R.id.pagerLoad).setVisibility(View.GONE);

         }
      });
   }

   @Override
   public void onImageTouched() {
      finish();
   }

   public static void showPic(Context context, String path) {
      if (TextUtils.isEmpty(path)) return ;

      ArrayList<String> picurls = new ArrayList<>();
      picurls.add(path);
      showPic(context, picurls);
   }

   public static void showPic(Context context, ArrayList<String> picurls) {
      showPic(context, picurls, 0);
   }

   public static void showPic(Context context, ArrayList<String> picurls, int postion) {
      if (null == picurls || picurls.size() == 0) return ;

      Intent intent = new Intent(context, ActShowBigPicture.class);
      intent.putStringArrayListExtra(ActShowBigPicture.INTENT_PICURLS, picurls);
      if (postion != 0) {
         intent.putExtra(INTENT_SHOW_POS, postion);
      }
      context.startActivity(intent);
   }

   @Override
   protected boolean isNotSwipe() {
      return true;
   }
}

　　

ZoomImageView类参考前一篇随笔