code: public DrawerView addFixedItem(DrawerItem item) {
          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);
          updateFixedList();
          return this;
      }
docs: Adds a fixed item to the drawer view
  
  @param item Item to add