自定义对象的 Parcelable 实现

Question

我有 3 种 POJO 类型：一个包含成分的 Recipe，然后是包含步骤的成分。下面是我的设置，我正在尝试实现 Parcelable 并且无法确定适当的读写方法：

食谱.Java：

public class Recipe implements Parcelable {

protected List<Ingredients> ingredients;

private String id;

private String servings;

private String name;

private String image;

private List<Steps> steps;

protected Recipe(Parcel in) {

    in.createTypedArray(CREATOR.createFromParcel(Ingredients));

    in.createTypedArray(Ingredients.);

    id = in.readString();

    servings = in.readString();

    name = in.readString();

    image = in.readString();

    steps = in.readArrayList(ClassLoader.getSystemClassLoader());

}

public static final Creator<Ingredients> CREATOR = new Creator<Ingredients>() {

    @Override

    public Ingredients createFromParcel(Parcel parcel) {

        return new Ingredients(parcel);

    }

    @Override

    public Ingredients[] newArray(int i) {

        return new Ingredients[0];

    }

}

public static final Creator<Recipe> CREATOR = new Creator<Recipe>() {

    @Override

    public Recipe createFromParcel(Parcel in) {

        return new Recipe(in);

    }

    @Override

    public Recipe[] newArray(int size) {

        return new Recipe[size];

    }

};

public List<Ingredients> getIngredients() {

    return ingredients;

}

public void setIngredients(List<Ingredients> ingredients) {

    this.ingredients = ingredients;

}

public String getId() {

    return id;

}

public void setId(String id) {

    this.id = id;

}

public String getServings() {

    return servings;

}

public void setServings(String servings) {

    this.servings = servings;

}

public String getName() {

    return name;

}

public void setName(String name) {

    this.name = name;

}

public String getImage() {

    return image;

}

public void setImage(String image) {

    this.image = image;

}

public List<Steps> getSteps() {

    return steps;

}

public void setSteps(List<Steps> steps) {

    this.steps = steps;

}

Answer 1

我建议您使用Paperparcel等第三方库来减少样板文件。使用示例：@PaperParcel // (1)public final class User implements Parcelable {&nbsp; &nbsp; public static final Creator<User> CREATOR = PaperParcelUser.CREATOR; // (2)&nbsp; &nbsp; long id; // (3)&nbsp; &nbsp; String firstName; // (3)&nbsp; &nbsp; String lastName; // (3)&nbsp; &nbsp; @Override public int describeContents() {&nbsp; &nbsp; &nbsp; &nbsp; return 0;&nbsp; &nbsp; }&nbsp; &nbsp; @Override public void writeToParcel(Parcel dest, int flags) {&nbsp; &nbsp; &nbsp; &nbsp; PaperParcelUser.writeToParcel(this, dest, flags); // (4)&nbsp; &nbsp; }}