How to use

getSelectedItems

method

in

com.mikepenz.fastadapter.FastAdapter

  @Override
  public void onSelectionChanged(SimpleItem item, boolean selected) {
    Log.i("FastAdapter", "SelectedCount: " + mFastAdapter.getSelections().size() + " ItemsCount: " + mFastAdapter.getSelectedItems().size());
  }
});

  @Override
  public boolean onClick(View v, IAdapter<SimpleItem> adapter, @NonNull SimpleItem item, int position) {
    Toast.makeText(v.getContext(), "SelectedCount: " + mFastAdapter.getSelections().size() + " ItemsCount: " + mFastAdapter.getSelectedItems().size(), Toast.LENGTH_SHORT).show();
    return false;
  }
});

@Override
public void saveInstanceState(@Nullable Bundle savedInstanceState, String prefix) {
  if (savedInstanceState == null) {
    return;
  }
  Set<Item> selections = mFastAdapter.getSelectedItems();
  long[] selectionsArray = new long[selections.size()];
  int i = 0;
  for (Item item : selections) {
    selectionsArray[i] = item.getIdentifier();
    i++;
  }
  //remember the selections
  savedInstanceState.putLongArray(BUNDLE_SELECTIONS + prefix, selectionsArray);
}

/**
 * helper method to get all selections from the ItemAdapter's original item list
 *
 * @return a Set with the selected items out of all items in this itemAdapter (not the listed ones)
 */
public Set<Item> getSelectedItems() {
  if (mOriginalItems != null) {
    Set<Item> selections = new HashSet<>();
    for (int i = 0, size = mOriginalItems.size(); i < size; i++) {
      Item item = mOriginalItems.get(i);
      if (item.isSelected()) {
        selections.add(item);
      }
    }
    return selections;
  } else {
    return mItemAdapter.getFastAdapter().getSelectedItems();
  }
}

@Test
public void select() throws Exception {
  adapter.withSelectable(true);
  itemAdapter.set(TestDataGenerator.genTestItemList(100));
  assertThat(adapter.getSelectedItems().size()).isEqualTo(0);
  assertThat(adapter.getSelections().size()).isEqualTo(0);
  adapter.select(10);
  assertThat(adapter.getSelectedItems().size()).isEqualTo(1);
  assertThat(adapter.getSelectedItems().iterator().next().getIdentifier()).isEqualTo(10);
  assertThat(adapter.getSelections().size()).isEqualTo(1);
  assertThat(adapter.getSelections().iterator().next()).isEqualTo(10);
}