class MainActivity : AppCompatActivity() {

    suspend fun fetchTextRemote() = async {
        URL("<https://httpbin.org/ip>").openConnection().getInputStream().bufferedReader().readText()
    }

    fun fetchText() = async(UI) {
        maintext.text = fetchTextRemote().await()
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        fetchText()
    }
}

await()