code: @SuppressWarnings("unused")
      public SwipeActionAdapter setFixedBackgrounds(boolean fixedBackgrounds){
          this.mFixedBackgrounds = fixedBackgrounds;
          if(mListView != null) mTouchListener.setFixedBackgrounds(fixedBackgrounds);
          return this;
      }
docs: Set whether the backgrounds should be fixed or swipe in from the side
  The default value for this property is false: backgrounds will swipe in
  
  @param fixedBackgrounds true for fixed backgrounds, false for swipe in