Added OnViewDoubleTapListener

photoview/src/main/java/com/github/chrisbanes/photoview/OnViewDoubleTapListener.java

@@ -0,0 +1,15 @@
+package com.github.chrisbanes.photoview;
+
+import android.view.View;
+
+public interface OnViewDoubleTapListener {
+    /**
+     * A callback to receive where the user double taps on a ImageView. You will receive a callback if
+     * the user taps anywhere on the view, tapping on 'whitespace' will not be ignored.
+     *
+     * @param view - View the user double tapped.
+     * @param x    - where the user tapped from the left of the View.
+     * @param y    - where the user tapped from the top of the View.
+     */
+    void onViewDoubleTap(View view, float x, float y);
+}

photoview/src/main/java/com/github/chrisbanes/photoview/PhotoView.java

@@ -222,6 +222,10 @@ public void setOnViewTapListener(OnViewTapListener listener) {
         attacher.setOnViewTapListener(listener);
     }
 
+    public void setOnViewDoubleTapListener(OnViewDoubleTapListener listener) {
+        attacher.setOnViewDoubleTapListener(listener);
+    }
+
     public void setOnViewDragListener(OnViewDragListener listener) {
         attacher.setOnViewDragListener(listener);
     }

photoview/src/main/java/com/github/chrisbanes/photoview/PhotoViewAttacher.java

@@ -81,6 +81,7 @@ public class PhotoViewAttacher implements View.OnTouchListener,
     private OnPhotoTapListener mPhotoTapListener;
     private OnOutsidePhotoTapListener mOutsidePhotoTapListener;
     private OnViewTapListener mViewTapListener;
+    private OnViewDoubleTapListener mViewDoubleTapListener;
     private View.OnClickListener mOnClickListener;
     private OnLongClickListener mLongClickListener;
     private OnScaleChangedListener mScaleChangeListener;
@@ -234,6 +235,9 @@ public boolean onDoubleTap(MotionEvent ev) {
                     } else {
                         setScale(getMinimumScale(), x, y, true);
                     }
+                    if (mViewDoubleTapListener != null) {
+                        mViewDoubleTapListener.onViewDoubleTap(mImageView, x, y);
+                    }
                 } catch (ArrayIndexOutOfBoundsException e) {
                     // Can sometimes happen when getX() and getY() is called
                 }
@@ -434,6 +438,10 @@ public void setOnViewTapListener(OnViewTapListener listener) {
         mViewTapListener = listener;
     }
 
+    public void setOnViewDoubleTapListener(OnViewDoubleTapListener listener) {
+        mViewDoubleTapListener = listener;
+    }
+
     public void setOnViewDragListener(OnViewDragListener listener) {
         mOnViewDragListener = listener;
     }