在 Kotlin 中使用参数的单例 [英] Singleton with argument in Kotlin

问题描述

Kotlin 参考说我可以使用 object 像这样的关键字:

The Kotlin reference says that I can create a singleton using the object keyword like so:

object DataProviderManager {
  fun registerDataProvider(provider: DataProvider) {
    //
  }
}

但是，我想向该对象传递一个参数.例如，Android 项目中的 ApplicationContext.

However, I would like to pass an argument to that object. For example an ApplicationContext in an Android project.

有没有办法做到这一点?

Is there a way to do this?

推荐答案

由于对象没有构造函数，我做了以下操作以在初始设置中注入值.您可以随心所欲地调用该函数，并且可以随时调用它来修改值(或根据需要重建单例).

Since objects do not have constructors what I have done the following to inject the values on an initial setup. You can call the function whatever you want and it can be called at any time to modify the value (or reconstruct the singleton based on your needs).

object Singleton {
    private var myData: String = ""

    fun init(data: String)  {
        myData = data
    }

    fun singletonDemo() {
        System.out.println("Singleton Data: ${myData}")
    }
}

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