MainActivity.kt

/**
     * Interface for getting the instance of binder from our service class
     * So client can get instance of our service class and can directly communicate with it.
     */
    private val serviceConnection = object : ServiceConnection {
        override fun onServiceConnected(className: ComponentName, iBinder: IBinder) {
            Log.d(mTAG, "ServiceConnection: connected to service.")
            // We've bound to MyService, cast the IBinder and get MyBinder instance
            val binder = iBinder as MyBinder
            mService = binder.service
            mIsBound = true
            getRandomNumberFromService() // return a random number from the service
        }

        override fun onServiceDisconnected(arg0: ComponentName) {
            Log.d(mTAG, "ServiceConnection: disconnected from service.")
            mIsBound = false
        }
    }