code: @SuppressWarnings("unused")
      public SwipeActionAdapter setDimBackgrounds(boolean dimBackgrounds){
          this.mDimBackgrounds = dimBackgrounds;
          if(mListView != null) mTouchListener.setDimBackgrounds(dimBackgrounds);
          return this;
      }
docs: Set whether the backgrounds should be dimmed when in no-trigger zone
  The default value for this property is false: backgrounds will not dim
  
  @param dimBackgrounds true for dimmed backgrounds, false for no opacity change