Question

我正在https://github.com/antoniolg/Kotlin-for-Android-Developers

学习“Kotlin for Android Developers（书籍）”的示例

在不同的kt文件中有三个类，我认为这三个类是相似的，而这些多个类使程序变得复杂。

如何重新设计项目框架并使项目更清晰？

DbClasses.kt

class DayForecast(var map: MutableMap<String, Any?>) {
    var _id: Long by map
    var date: Long by map
    var description: String by map
    var high: Int by map
    var low: Int by map
    var iconUrl: String by map
    var cityId: Long by map

    constructor(date: Long, description: String, high: Int, low: Int, iconUrl: String, cityId: Long)
            : this(HashMap()) {
        this.date = date
        this.description = description
        this.high = high
        this.low = low
        this.iconUrl = iconUrl
        this.cityId = cityId
    }
}

tables.kt

object DayForecastTable {
    val NAME = "DayForecast"
    val ID = "_id"
    val DATE = "date"
    val DESCRIPTION = "description"
    val HIGH = "high"
    val LOW = "low"
    val ICON_URL = "iconUrl"
    val CITY_ID = "cityId"
}

DomainClasses.kt

data class Forecast(
    val id: Long,
    val date: Long,
    val description: String,
    val high: Int, 
    val low: Int,
    val iconUrl: String
)

Answer 1

就数据库相关类而言，您可以考虑使用ORM库来注释字段并生成数据库表模式（删除对DayForecastTable的需求），例如：房间（https://developer.android.com/training/data-storage/room/index.html）

您可以在整个应用程序中使用这些类来减少对DomainClasses的需求，尽管我建议保留Domain层类以使域模型独立于数据库。

如何设计减少Kotlin中的冗余类？

1 个答案: