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<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
                                        xmlns:tools="http://schemas.android.com/tools"
                                        android:id="@+id/rv_pokemons"
                                        android:layout_width="match_parent"
                                        android:layout_height="match_parent"
                                        android:padding="2dp"
                                        tools:context="io.husayn.paging_library_sample.listing.MainActivity"/>

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<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="2dp"
    app:cardCornerRadius="@dimen/cardview_default_radius"
    app:cardElevation="@dimen/cardview_default_elevation"
    app:cardUseCompatPadding="true">

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public static final DiffCallback<Pokemon> DIFF_CALLBACK = new DiffCallback<Pokemon>() {
    @Override
    public boolean areItemsTheSame(@NonNull Pokemon oldPokemon, @NonNull Pokemon newPokemon) {
        return oldPokemon.id == newPokemon.id;
    }
        
    @Override
    public boolean areContentsTheSame(@NonNull Pokemon oldPokemon, @NonNull Pokemon newPokemon) {
        return oldPokemon.name.equals(newPokemon.name);
    }

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@Query("SELECT * FROM pokemon ORDER BY id ASC")
LivePagedListProvider<Integer, Pokemon> pokemons();

@Insert
void insert(Pokemon... pokemons);

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@Database(entities = {Pokemon.class}, version = 1)
public abstract class PokemonDataBase extends RoomDatabase {

    private static final String POKEMON_DB = "pokemon.db";

    public abstract PokemonDao pokemonDao();

    private static PokemonDataBase pokemonDB;

    public static PokemonDataBase getInstance(Context context) {

husaynhakeem

@Database(entities = {Pokemon.class}, version = 1)
public abstract class PokemonDataBase extends RoomDatabase {

    private static final String POKEMON_DB = "pokemon.db";
    public abstract PokemonDao pokemonDao();
    private static PokemonDataBase pokemonDB;

    public static PokemonDataBase getInstance(Context context) {
        if (pokemonDB == null)
            pokemonDB = Room.databaseBuilder(context.getApplicationContext(), PokemonDataBase.class, POKEMON_DB).build();

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public void populateDB() {
    Completable.fromAction(() -> PokemonDataBase.getInstance(context).pokemonDao().insert(pokemonList()))
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(this::onDBPopulationSuccess, this::onDBPopulationFailure);
}

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public PokemonAdapter() {
    super(Pokemon.DIFF_CALLBACK);
}

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public MainViewModel() {
   PokemonDao pokemonDao = PokemonDataBase.getInstance(PokemonApplication.getContext()).pokemonDao();
   pokemonList = pokemonDao.pokemons().create(INITIAL_LOAD_KEY, new PagedList.Config.Builder()
        .setPageSize(PAGE_SIZE)
        .setPrefetchDistance(PREFETCH_DISTANCE)
        .setEnablePlaceholders(true)
        .build()
    );
}

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MainViewModel viewModel = ViewModelProviders.of(this).get(MainViewModel.class);
final PokemonAdapter adapter = new PokemonAdapter();
viewModel.pokemonList.observe(this, adapter::setList);