Android 实现文件室时出错

错误：

我的实体是

Entities and Pojos must have a usable public constructor. You can have an empty constructor or a constructor whose parameters match the fields (by name and type).  

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根据错误消息，您需要为此类添加构造函数

@Entity
data class Category(var category: String) {

@field: PrimaryKey(autoGenerate = true)
var categoryId: Int = 0


}

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发布模型类以供参考。错误解释了错误。添加一个空构造函数（例如：

publicdog（）{}

）

@Entity data class Category(var category: String) {

@field: PrimaryKey(autoGenerate = true) var categoryId: Int = 0

constructor() : this(0) 

}