Question

我在领域有一个数据库，需要将一个领域对象作为我创建的java对象传递，以便我的适配器识别它。

public final static Parcelable.Creator<MoviePOJO> CREATOR = new Creator<MoviePOJO>() {

    @SuppressWarnings({
            "unchecked"
    })
    public MoviePOJO createFromParcel(Parcel in) {
        MoviePOJO instance = new MoviePOJO();
        instance.posterPath = ((String) in.readValue((String.class.getClassLoader())));
        instance.overview = ((String) in.readValue((String.class.getClassLoader())));
        instance.releaseDate = ((String) in.readValue((String.class.getClassLoader())));
        instance.id = ((Integer) in.readValue((Integer.class.getClassLoader())));
        instance.originalTitle = ((String) in.readValue((String.class.getClassLoader())));
        instance.backdropPath = ((String) in.readValue((String.class.getClassLoader())));
        instance.voteAverage = ((Double) in.readValue((Double.class.getClassLoader())));
        return instance;
    }

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

是电影创作者，我的RealmObject是：

public class FavoritesItem extends RealmObject implements Parcelable {

    @PrimaryKey  private Integer movieId;
    private String moviePoster;
    private String movieBackdrop;
    private String movieTitle;
    private String movieOverview;
    private Double movieRating;
    private String movieReleaseDate;
}

如何将其中一个送到另一个？

Answer 1

假设，正如@ cricket_007建议的那样，你想从Realm DB中获取一个对象，然后将它发送到Intent上的某个地方（反之亦然），你有两个选择。

到目前为止，最好的办法是避免发送整个对象。如果您只是在自己的应用中发送给Activity或IntentService，只需发送主键（可能是movieId）。收件人可以打开Realm实例并选择相同的对象。远比甚至分割更快

。

如果绝对必须包裹，那么您将需要一个适配器，如下所示：

public class MovieParcelable implements Parcelable {

    public static final Creator<MovieParcelable> CREATOR = new Creator<MovieParcelable>() {
        @Override
        public MovieParcelable createFromParcel(Parcel in) {
            int id = in.readInt();
            String poster = in.readString();
            // ...
            double rating = in.readDouble();
            String releaseDate = in.readString();
            return new MovieParcelable(id, poster, ..., rating, releaseDate);
        }

        @Override
        public MovieParcelable[] newArray(int size) {
            return new MovieParcelable[size];
        }
    };

    private final Movie movie;

    public MovieParcelable(Movie movie) {
        this.movie = movie;
    }

    MovieParcelable(int id, String poster, ..., double rating, String releaseDate) {
        this(new Movie(id, poster, ..., rating, releaseDate));
    }

    public Movie getMovie() { return movie; }

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(movie.getId());
        dest.writeString(movie.getPoster());
        // ...
        dest.writeDouble(movie.getRating());
        dest.writeString(movie.getReleaseDate());
    }
}

如何使我的领域对象成为java对象？

1 个答案: