Mercury-IM/app/src/main/java/org/olomono/messenger/view/roster/RosterEntryListFragment.java

package org.olomono.messenger.view.roster;

import android.arch.lifecycle.Observer;
import android.arch.lifecycle.ViewModelProviders;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import org.olomono.messenger.R;
import org.olomono.messenger.persistence.database.model.RosterEntryModel;
import org.olomono.messenger.view.viewmodel.RosterEntryListViewModel;

import java.util.ArrayList;
import java.util.List;

/**
 * A placeholder fragment containing a simple view.
 */
public class RosterEntryListFragment extends Fragment {

    private RosterEntryListViewModel viewModel;
    private RosterEntryListRecyclerViewAdapter recyclerViewAdapter;
    private RecyclerView recyclerView;

    public RosterEntryListFragment() {

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_roster_entry_list, container, false);

        recyclerView = view.findViewById(R.id.roster_entry_list__recycler_view);
        recyclerViewAdapter = new RosterEntryListRecyclerViewAdapter(new ArrayList<>());
        recyclerView.setAdapter(recyclerViewAdapter);

        viewModel = ViewModelProviders.of(this).get(RosterEntryListViewModel.class);
        viewModel.getRosterEntryList().observe(RosterEntryListFragment.this, new Observer<List<RosterEntryModel>>() {
            @Override
            public void onChanged(@Nullable List<RosterEntryModel> rosterEntryModels) {
                recyclerViewAdapter.addItems(rosterEntryModels);
            }
        });

        return view;
    }
}