How to use

addExtension

method

in

com.mikepenz.fastadapter.FastAdapter

/**
 * Set to true if you want the items to be selectable. 
 * By default, no items are selectable
 *
 * @param selectable true if items are selectable
 * @return this
 */
public FastAdapter<Item> withSelectable(boolean selectable) {
  if (selectable) {
    addExtension(mSelectExtension);
  } else {
    mExtensions.remove(mSelectExtension.getClass());
  }
  //TODO revisit this --> false means anyways that it is not in the extension list!
  mSelectExtension.withSelectable(selectable);
  return this;
}

/**
 * Define a custom Adapter which will be used in the drawer
 * NOTE: this is not recommender
 * WARNING: if you do this after adding items you will loose those!
 *
 * @param adapter the FastAdapter to use with this drawer
 * @return this
 */
public DrawerBuilder withAdapter(@NonNull FastAdapter<IDrawerItem> adapter) {
  this.mAdapter = adapter;
  //we have to rewrap as a different FastAdapter was provided
  adapter.addAdapter(0, mHeaderAdapter);
  adapter.addAdapter(1, mItemAdapter);
  adapter.addAdapter(2, mFooterAdapter);
  adapter.addExtension(mExpandableExtension);
  return this;
}

/**
 * creates a new FastAdapter with the provided adapters
 * if adapters is null, a default ItemAdapter is defined
 *
 * @param adapters the adapters which this FastAdapter should use
 * @return a new FastAdapter
 */
@SuppressWarnings("unchecked")
public static <Item extends IItem, A extends IAdapter> FastAdapter<Item> with(@Nullable Collection<A> adapters, @Nullable Collection<IAdapterExtension<Item>> extensions) {
  FastAdapter<Item> fastAdapter = new FastAdapter<>();
  if (adapters == null) {
    fastAdapter.mAdapters.add((IAdapter<Item>) items());
  } else {
    fastAdapter.mAdapters.addAll((Collection<IAdapter<Item>>) adapters);
  }
  for (int i = 0; i < fastAdapter.mAdapters.size(); i++) {
    fastAdapter.mAdapters.get(i).withFastAdapter(fastAdapter).setOrder(i);
  }
  fastAdapter.cacheSizes();
  if (extensions != null) {
    for (IAdapterExtension<Item> extension : extensions) {
      fastAdapter.addExtension(extension);
    }
  }
  return fastAdapter;
}

@Before
public void setUp() throws Exception {
  itemAdapter = new ItemAdapter<>();
  adapter = FastAdapter.with(itemAdapter);
  selectExtension = new SelectExtension<>();
  adapter.addExtension(selectExtension);
  //adapter.withPositionBasedStateManagement(true);
}

@Before
public void setUp() throws Exception {
  itemAdapter = new ItemAdapter<>();
  expandableExtension = new ExpandableExtension<>();
  adapter = FastAdapter.with(itemAdapter);
  adapter.addExtension(expandableExtension);
  //adapter.withPositionBasedStateManagement(true);
}