ac_pois_list_fragment.java

public class PoisListFragment extends Fragment implements {

    private AcFragmentPoisListBinding mBinding;

    private PoisListAdapter mAdapter;

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        /* Inflate the layout for this fragment */
        mBinding = DataBindingUtil.inflate(inflater, R.layout.ac_fragment_pois_list, container, false);

        LinearLayoutManager layoutManager = new LinearLayoutManager(
                getActivity(),
                LinearLayoutManager.VERTICAL,
                false);
        mBinding.listRecyclerview.setLayoutManager(layoutManager);

        mBinding.listRecyclerview.setHasFixedSize(true);

        return mBinding.getRoot();
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        mAdapter = new PoisListAdapter(this);

        mBinding.listRecyclerview.setAdapter(mAdapter);

        if (getParentViewModel() != null) {
            getParentViewModel().getObservableAllPois().observe(this, list -> {
                if (list != null) {
                    Log.d(LOG_TAG, "New data received. Size: " + list.size());
                    mAdapter.setList((ArrayList<Poi>) list);
                }
            });
        }
    }

    private PoisViewModel getParentViewModel() {
        if (getActivity() != null)
            return ((MainActivity) getActivity()).getViewModel();
        else
            return null;
    }
}