kechukwu Eze SO

public class CustomListAdapter extends BaseAdapter {
     //Add Below Method
     public void reloadData(){
          this.originalMovieList = new ArrayList<Movie>(movieItems);
          notifyDataSetChanged();
     }
}

In your MainActivity Replace adapter.notifyDataSetChanged(); with adapter.reloadData();
Don't Replace your notifyDataSetChanged(); of CustomListAdapter with adapter.reloadData();