code: public RangeSelectorHelper withSavedInstanceState(Bundle savedInstanceState, String prefix) {
          if (savedInstanceState != null && savedInstanceState.containsKey(BUNDLE_LAST_LONG_PRESS + prefix))
              mLastLongPressIndex = savedInstanceState.getInt(BUNDLE_LAST_LONG_PRESS + prefix);
          return this;
      }
docs: restore the index of the last long pressed index
  IMPORTANT! Call this method only after all items where added to the adapters again. Otherwise it may select wrong items!
  
  @param savedInstanceState If the activity is being re-initialized after
  previously being shut down then this Bundle contains the data it most
  recently supplied in Note: Otherwise it is null.
  @param prefix             a prefix added to the savedInstance key so we can store multiple states
  @return this