creating customize listview through arrayAdapter

Whats wrong in this code..

public class MoviesListActivity extends ListActivity {


private ArrayList<Movie> moviesList;
private ArrayAdapter<Movie> moviesAdapter;

@SuppressWarnings("unchecked")
@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.movies_layout);

    moviesList = (ArrayList<Movie>) getIntent().getSerializableExtra("movies");

    moviesAdapter = new MoviesAdapter(this, R.layout.movie_data_row, moviesList);

    setListAdapter(moviesAdapter);

    if (moviesList!=null && !moviesList.isEmpty()) {
        longToast(String.valueOf(moviesList.size()));
        moviesAdapter.clear();
        moviesAdapter.notifyDataSetChanged();


            for (int i = 0; i < moviesList.size(); i++) {
                moviesAdapter.add(moviesList.get(i)); 

            }

        }

        moviesAdapter.notifyDataSetChanged();
}

after moviesAdapter.clear();, moviesList.size() become zero. and before clear code movieslist get some data. Now after removing moviesAdapter.clear(), application get force close... Pls help..Thanks