How to run a function from one class in another class in Android Studio [Kotlin]?

Question

I am trying to save user preferences for language, so I have a preferences class with a setter and getter for language, as well as a separate Language activity where the user actually picks which language they want.

From this language activity, I want to use the setter to set the user's chosen language preference within the preferences class. Here is the preferences class:

class Preferences (context: Context) {
    val PREFS_FILENAME = "artour.prefs"
    val LANGUAGE = "language"
    val prefs: SharedPreferences = context.getSharedPreferences(PREFS_FILENAME, Context.MODE_PRIVATE);

    fun getLang() : String {
        return prefs.getString(LANGUAGE, "english")
    }

    public fun setLang(lang:String) {
        val editor = prefs.edit()
        editor.putString(LANGUAGE, lang)
        editor.apply()
    }
}

How would I go about running the setLang method from the language activity?

Possible duplicate of Call method from Kotlin class

leonardkraemer
– leonardkraemer

2018-04-04 22:29:52 +00:00
Commented Apr 4, 2018 at 22:29 — leonardkraemer
– leonardkraemer, Commented Apr 4, 2018 at 22:29

leonardkraemer · Accepted Answer · 2018-04-05 00:37:34Z

4

I dont now if I'm missing anything in this question, but just do this:

val preferences = Preferences(this)
preferences.setLang("it is that easy")

in any function in your activity class.

What it does is create an object (val preferences = Preferences()) and then calling a method on it (preferences.setLang("this is a string")).
Make sure to use an actual language identifier instead of a random string though.

edited Apr 5, 2018 at 0:37

answered Apr 4, 2018 at 22:35

leonardkraemer

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2 Comments

Lassley Over a year ago

Thanks a ton, turns out I was a little off on my syntax with it, I'm super new to kotlin. When I type the first line, it says I have to pass a parameter for context for Parameter(). Do you know what I would pass for "context"? Thanks again

leonardkraemer Over a year ago

A Context see indirect subclasses -> your Activity -> inside the Actiity-class it is just this.

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