How to implement lateinit properly with custom class objects for use in onCreate() in android avoiding 'Property getter or setter expected' error

Question

I am trying to implement the integration of a Dialogflow (previously api.ai) agent with my Android app, using Kotlin. I checked other Q&A about kotlin lateinit and the onCreate() lifecycle in Android is ideal for late-init implementations, to avoid writing dirty code with null objects and corresponding !! and ? accesses in Kotlin. But I am running into the error of 'Property getter or setter expected' when trying to lateinint instances of self-defined class. Here is the code:

class AIApplication : Application() {

    private var activitiesCount: Int = 0

    var lateinit settingsManager: SettingsManager
        //private set

    private val isInForeground: Boolean
        get() = activitiesCount > 0

    override fun onCreate() {
        super.onCreate()

        settingsManager = SettingsManager(this)
    }

Which gives me the error of 'Property getter or setter expected' on the lateinit settingsManager line. Here is the SettingsManager definition:

class SettingsManager(private val context: Context) {
    private val prefs: SharedPreferences

    private var useBluetooth: Boolean = false

    var isUseBluetooth: Boolean
        get() = useBluetooth
        set(useBluetooth) {
            this.useBluetooth = useBluetooth

            prefs.edit().putBoolean(PREF_USE_BLUETOOTH, useBluetooth).commit()
            val controller = (context.applicationContext as AIApplication).getBluetoothController()
            if (useBluetooth) {
                controller!!.start()
            } else {
                controller!!.stop()
            }
        }

    init {
        prefs = context.getSharedPreferences(SETTINGS_PREFS_NAME, Context.MODE_PRIVATE)

        useBluetooth = prefs.getBoolean(PREF_USE_BLUETOOTH, true)
    }

    companion object {

        private val SETTINGS_PREFS_NAME = "ai.api.APP_SETTINGS"
        private val PREF_USE_BLUETOOTH = "USE_BLUETOOTH"
    }

}

So what is the proper way to do this? Do I need to make some changes to the SettingsManager class? Please explain the whole concept clearly.

Answer 1

The lateinit declaration of the SettingsManager is wrong. Try this :

lateinit var settingsManager: SettingsManager

instead of

var lateinit settingsManager: SettingsManager

Hope this helps.