Singleton with parameter in Kotlin

Question

I am trying to convert an Android app from Java to Kotlin. There are a few singletons in the app. I used a companion object for the singletons without constructor parameters

Answer 1

You can declare a Kotlin object, overloading "invoke" operator.

object TasksLocalDataSource: TasksDataSource {
    private lateinit var mDbHelper: TasksDbHelper

    operator fun invoke(context: Context): TasksLocalDataSource {
        this.mDbHelper = TasksDbHelper(context)
        return this
    }
}

Anyway I think that you should inject TasksDbHelper to TasksLocalDataSource instead of inject Context