MainActivity

public class MovieListActivity extends AppCompatActivity implements OnMovieListener {

    //RECYCLER VIEW FILM
    private RecyclerView recyclerView;
    private MovieRecyclerView movieRecyclerAdapter;

    //LIVE DATA MovieModel
    private MovieListViewModel movieListViewModel;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        recyclerView = (RecyclerView)findViewById(R.id.recyclerView);

        movieListViewModel = new ViewModelProvider(this).get(MovieListViewModel.class);

        //calling the observers
        //calling the method
        ConfigureRecyclerView();
        ObserveAnyChange();
        searchMovieApi("Avengers", 1);

      //Observing any data changes
    }
    private void ObserveAnyChange(){

        movieListViewModel.getMovies().observe(this, new Observer<List<MovieModel>>() {
            @Override
            public void onChanged(List<MovieModel> movieModels) {
                //Observing any data changes here
                if(movieModels != null){
                    for(MovieModel movieModel: movieModels){
                        Log.v("Tag", "onChanged: " + movieModel.getTitle());
                        movieRecyclerAdapter.setmMovies(movieModels);
                    }
                }
            }
        });

    }
    //Calling method in Main Activity
    private void searchMovieApi(String query, int pageNumber){
        movieListViewModel.searchMovieApi(query, pageNumber);
    }

  private void ConfigureRecyclerView(){
      movieRecyclerAdapter = new MovieRecyclerView(this);
      recyclerView.setAdapter(movieRecyclerAdapter);
      recyclerView.setLayoutManager(new LinearLayoutManager(this));
  }
    @Override
    public void onMovieClick(int position) {
    }

    @Override
    public void onCategoryClick(String category) {
    }
}