对不起,如果怀疑太概念化,我有点缺乏经验......
我通过改造从 URL 获取 JSON 数据,并且我还想将这些数据存储在我的 SQLite 数据库中。为了创建这个数据库,我将使用新的 Room ORM 映射。
我使用 Android Studio 插件 GsonFormat 提取网络 POJO 类,它生成下面的食谱、成分和步骤类。并生成一些房间实体类(更多下文)
如您所见,两组类几乎相同,带来了大量重复代码。但我也觉得这两组类混合使用并不好。并且 Room 禁止实体对象相互引用,所以如果我想使用第一组类,那就更复杂了……
我的疑问是这些案件一般是如何处理的?
--- Pojo - Gson 可以理解:
public class Recipes {
private int id;
private String name;
private int servings;
private String image;
private List<Ingredients> ingredients;
private List<Steps> steps;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getServings() {
return servings;
}
public void setServings(int servings) {
this.servings = servings;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public List<Ingredients> getIngredients() {
return ingredients;
}
public void setIngredients(List<Ingredients> ingredients) {
this.ingredients = ingredients;
}
public List<Steps> getSteps() {
return steps;
}
public void setSteps(List<Steps> steps) {
this.steps = steps;
}
@Override
public String toString() {
return "Recipes{" +
"id=" + id +
", name='" + name + '\'' +
", servings=" + servings +
", image='" + image + '\'' +
", ingredients=" + ingredients +
", steps=" + steps +
'}';
}
}
class Ingredients {
private double quantity;
private String measure;
private String ingredient;
public double getQuantity() {
return quantity;
}
public void setQuantity(double quantity) {
this.quantity = quantity;
}
public String getMeasure() {
return measure;
}
public void setMeasure(String measure) {
this.measure = measure;
}
public String getIngredient() {
return ingredient;
}
public void setIngredient(String ingredient) {
this.ingredient = ingredient;
}
@Override
public String toString() {
return "Ingredients{" +
"quantity=" + quantity +
", measure='" + measure + '\'' +
", ingredient='" + ingredient + '\'' +
'}';
}
}
class Steps {
private int id;
private String shortDescription;
private String description;
private String videoURL;
private String thumbnailURL;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getShortDescription() {
return shortDescription;
}
public void setShortDescription(String shortDescription) {
this.shortDescription = shortDescription;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getVideoURL() {
return videoURL;
}
public void setVideoURL(String videoURL) {
this.videoURL = videoURL;
}
public String getThumbnailURL() {
return thumbnailURL;
}
public void setThumbnailURL(String thumbnailURL) {
this.thumbnailURL = thumbnailURL;
}
@Override
public String toString() {
return "Steps{" +
"id=" + id +
", shortDescription='" + shortDescription + '\'' +
", description='" + description + '\'' +
", videoURL='" + videoURL + '\'' +
", thumbnailURL='" + thumbnailURL + '\'' +
'}';
}
}
--- 房间实体类
@Entity
public class Recipe {
@PrimaryKey
private int id;
private String name;
private int servings;
private String image;
}
@Entity(foreignKeys = @ForeignKey(entity = Recipe.class,
parentColumns = "id",
childColumns = "recipeId"))
public class Ingredient {
@PrimaryKey
private int id;
private double quantity;
private String measure;
private String ingredient;
private int recipeId;
}