更改旋转设备后Android刷新适配器

Question

在我的下面的简单代码中，为什么我的适配器在更改旋转设备后无法刷新添加的新数据？

添加到第一次没有任何问题的适配器和刷新，但是在向其添加一些数据并更改设备方向之后。

我正在添加其他数据，我希望刷新添加新的，例如在第一时间我向适配器添加1个数据，适配器可以知道并且可以刷新，我看到添加的数据适配器，之后，我将设备方向从例如portrait更改为landscape

现在我再次向适配器添加1个数据，我希望适配器可以刷新添加2个项目。

适配器有2项但无法刷新，有提示：

更改方向后

可以使用上次添加的项目刷新设备适配器

public class MainActivity extends AppCompatActivity {
    private List<Movie> movieList = new ArrayList<>();
    private RecyclerView  recyclerView;
    private MoviesAdapter mAdapter;
    private Movie         movie;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

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

        mAdapter = new MoviesAdapter(movieList);

        recyclerView.setHasFixedSize(true);
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
        recyclerView.setLayoutManager(mLayoutManager);
        recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        recyclerView.setAdapter(mAdapter);

        recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getApplicationContext(), recyclerView, new RecyclerTouchListener.ClickListener() {
            @Override
            public void onClick(View view, int position) {
                movie = new Movie("Guardians of the Galaxy", "Science Fiction & Fantasy", "2014");
                movieList.add(movie);
                mAdapter.notifyDataSetChanged();
            }

            @Override
            public void onLongClick(View view, int position) {

            }
        }));

        if (savedInstanceState != null) {
            movieList = savedInstanceState.getParcelableArrayList("key");
            mAdapter.setData(movieList);
            mAdapter.notifyDataSetChanged();
        } else {
            prepareMovieData();
        }
    }

    private void prepareMovieData() {
        movie = new Movie("Mad Max: Fury Road", "Action & Adventure", "2015");
        movieList.add(movie);

        mAdapter.notifyDataSetChanged();
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        outState.putParcelableArrayList("key", (ArrayList) movieList);
        super.onSaveInstanceState(outState);
    }
}

MoviesAdapter：

public class MoviesAdapter extends RecyclerView.Adapter<MoviesAdapter.MyViewHolder> {
    private List<Movie> moviesList;
    public void setData(List<Movie> mMovieList) {
        moviesList.clear();
        moviesList.addAll(mMovieList);
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView title, year, genre;

        public MyViewHolder(View view) {
            super(view);
            title = (TextView) view.findViewById(R.id.title);
            genre = (TextView) view.findViewById(R.id.genre);
            year = (TextView) view.findViewById(R.id.year);
        }
    }


    public MoviesAdapter(List<Movie> moviesList) {
        this.moviesList = moviesList;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.movie_list_row, parent, false);

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        Movie movie = moviesList.get(position);
        holder.title.setText(movie.getTitle());
        holder.genre.setText(movie.getGenre());
        holder.year.setText(movie.getYear());
    }

    @Override
    public int getItemCount() {
        return moviesList.size();
    }
}

电影：

public class Movie implements Parcelable {
    private String title, genre, year;

    public Movie() {
    }

    public Movie(String title, String genre, String year) {
        this.title = title;
        this.genre = genre;
        this.year = year;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String name) {
        this.title = name;
    }

    public String getYear() {
        return year;
    }

    public void setYear(String year) {
        this.year = year;
    }

    public String getGenre() {
        return genre;
    }

    public void setGenre(String genre) {
        this.genre = genre;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    private Movie(Parcel in) {
        title = in.readString();
        genre = in.readString();
        year = in.readString();
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(title);
        dest.writeString(genre);
        dest.writeString(year);
    }

    public static final Parcelable.Creator<Movie> CREATOR = new Parcelable.Creator<Movie>() {
        public Movie createFromParcel(Parcel in) {
            return new Movie(in);
        }

        public Movie[] newArray(int size) {
            return new Movie[size];
        }
    };
}