Parcelable 对象列表的 Parcel List

Question

所以我之前已经打包了列表，但是我正在尝试打包我的 GameBoard 对象，它实际上有一个 List<List<Tile>>。 Tile 实现了 parcelable，但我不确定如何将 List<List> 打包。这是我尝试过的：

public class GameBoard implements Parcelable {
    private String _id;
    public String getId() { return _id; }
    public void setId(String id) { _id = id; }

    private List<List<Tile>> _tiles;
    public List<List<Tile>> getTiles() { return _tiles; }
    public void setTiles(List<List<Tile>> tiles) { _tiles = tiles; }

    public GameBoard(Parcel in) {
        _id = in.readString();
        in.readList(_tiles, ArrayList.class.getClassLoader());
    }

    public GameBoard() {

    }

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

    @Override
    public void writeToParcel(Parcel parcel, int i) {
        parcel.writeString(_id);
        parcel.writeList(_tiles);
    }

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

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

tile 类正确地实现了 parcelable，我只是不完全确定在 parcel 此类时如何读取/写入 List<List>>。有什么想法吗？

Answer 1

基于cmets，我用我的自定义类扩展了ArrayList类并实现了parcelable：

public class TileList extends ArrayList<Tile> implements Parcelable {

    public TileList(){
        super();
    }

    protected TileList(Parcel in) {
        in.readTypedList(this, Tile.CREATOR);
    }

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

    @Override
    public void writeToParcel(Parcel parcel, int i) {
        parcel.writeTypedList(this);
    }

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

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

对我的其他班级稍作改动：

public class GameBoard implements Parcelable {
    private String _id;
    public String getId() { return _id; }
    public void setId(String id) { _id = id; }

    private List<TileList> _tiles;
    public List<TileList> getTiles() { return _tiles; }
    public void setTiles(List<TileList> tiles) { _tiles = tiles; }

    public GameBoard(Parcel in) {
        _id = in.readString();
        _tiles = new ArrayList<>();
        in.readTypedList(_tiles, TileList.CREATOR);
    }

    public GameBoard() {

    }

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

    @Override
    public void writeToParcel(Parcel parcel, int i) {
        parcel.writeString(_id);
        parcel.writeTypedList(_tiles);
    }

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

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