class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.main_activity)
        findNavController(R.id.navHost)

        registerReceiver(
            object : BroadcastReceiver() {
                override fun onReceive(context: Context?, intent: Intent?) {
                    Toast.makeText(context, "TEST", Toast.LENGTH_LONG).show()
                }

            },
            IntentFilter("android.net.conn.CONNECTIVITY_CHANGE")
        )
    }
}