Swappable returns a boolean for saying if the swap occured or not

lib-core-slh/build.gradle

@@ -62,4 +62,4 @@ android {
         textOutput 'stdout'
         warningsAsErrors true
     }
-}
+}

lib-core/src/main/java/com/nhaarman/listviewanimations/ArrayAdapter.java

@@ -137,10 +137,11 @@ public T remove(final int location) {
     }
 
     @Override
-    public void swapItems(final int positionOne, final int positionTwo) {
+    public boolean swapItems(final int positionOne, final int positionTwo) {
         T firstItem = mItems.set(positionOne, getItem(positionTwo));
         notifyDataSetChanged();
         mItems.set(positionTwo, firstItem);
+        return true;
     }
 
     public void propagateNotifyDataSetChanged(@NonNull final BaseAdapter slavedAdapter) {

lib-core/src/main/java/com/nhaarman/listviewanimations/BaseAdapterDecorator.java

@@ -227,12 +227,14 @@ public Object[] getSections() {
     }
 
     @Override
-    public void swapItems(final int positionOne, final int positionTwo) {
+    public boolean swapItems(final int positionOne, final int positionTwo) {
         if (mDecoratedBaseAdapter instanceof Swappable) {
             ((Swappable) mDecoratedBaseAdapter).swapItems(positionOne, positionTwo);
+            return true;
         } else {
             Log.w("ListViewAnimations", "Warning: swapItems called on an adapter that does not implement Swappable!");
         }
+        return false;
     }
 
     @Override

lib-core/src/main/java/com/nhaarman/listviewanimations/util/Swappable.java

@@ -29,5 +29,5 @@ public interface Swappable {
      * @param positionOne First adapter position.
      * @param positionTwo Second adapter position.
      */
-    void swapItems(int positionOne, int positionTwo);
+    boolean swapItems(int positionOne, int positionTwo);
 }

lib-manipulation/src/main/java/com/nhaarman/listviewanimations/itemmanipulation/dragdrop/DragAndDropHandler.java

@@ -430,11 +430,13 @@ private void switchViews(final View switchView, final long switchId, final float
         final int switchViewPosition = mWrapper.getPositionForView(switchView);
         int mobileViewPosition = mWrapper.getPositionForView(mMobileView);
 
-        ((Swappable) mAdapter).swapItems(switchViewPosition - mWrapper.getHeaderViewsCount(), mobileViewPosition - mWrapper.getHeaderViewsCount());
-        ((BaseAdapter) mAdapter).notifyDataSetChanged();
+        boolean didSwap = ((Swappable) mAdapter).swapItems(switchViewPosition - mWrapper.getHeaderViewsCount(), mobileViewPosition - mWrapper.getHeaderViewsCount());
+        if (didSwap) {
+            ((BaseAdapter) mAdapter).notifyDataSetChanged();
 
-        mHoverDrawable.shift(switchView.getHeight());
-        mSwitchViewAnimator.animateSwitchView(switchId, translationY);
+            mHoverDrawable.shift(switchView.getHeight());
+            mSwitchViewAnimator.animateSwitchView(switchId, translationY);
+        }
     }
 
     /**