code: public void removeActiveIndex(final int index) {
          boolean found = false;
          for (Iterator<AtomicInteger> iterator = mActiveIndexes.iterator(); iterator.hasNext() && !found; ) {
              if (iterator.next().get() == index) {
                  iterator.remove();
                  found = true;
              }
          }
          if (mActiveIndexes.isEmpty()) {
              insertPending();
          }
      }
docs: Clear the active state for given index. Will insert any pending pairs if this call leads to a state where there are no active pairs.
  
  @param index the index to remove.