WeakReference Handler

object WeakHandler : Handler() {
    private lateinit var weakReference: WeakReference<MainActivity>

    fun setActivity(activity: MainActivity) {
        weakReference = WeakReference(activity)
    }

    override fun handleMessage(msg: Message) {
        super.handleMessage(msg)

        val activity = weakReference.get()
        activity?.let {
            //do something
//            it.addressStr
        }
    }
}

private val weakHandler = WeakHandler
weakHandler.setActivity(this)
val msg = WeakHandler.obtainMessage()
msg.obj = text
msg.sendToTarget()