@Override
    public void onDestroyFloatView(View floatView) {
      ImageView imageView = floatView.findViewById(R.id.user_row_dragged_image);
      if (imageView != null) {
        imageView.setImageDrawable(null);
      }
      floatBitmap.recycle();
      floatBitmap = null;
    }
Removes the Bitmap created in onCreateFloatView() and tells the system to recycle it.
java/com/google/android/apps/authenticator/AuthenticatorActivity.java