code: public DrawerView addFixedItems(List<DrawerItem> items) {
          mAdapterFixed.setNotifyOnChange(false);
          for (DrawerItem item : items) {
              if (item.getId() <= 0) {
                  item.setId(System.nanoTime() * 100 + Math.round(Math.random() * 100));
              }
              for (DrawerItem oldItem : mAdapterFixed.getItems()) {
                  if (oldItem.getId() == item.getId()) {
                      mAdapterFixed.remove(oldItem);
                      break;
                  }
              }
  
              item.attachTo(mAdapterFixed);
              mAdapterFixed.add(item);
          }
          mAdapterFixed.setNotifyOnChange(true);
          mAdapterFixed.notifyDataSetChanged();
          updateFixedList();
          return this;
      }
docs: Adds fixed items to the drawer view
  
  @param items Items to add