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class MainActivity : AppCompatActivity(), CoroutineScope {

    override val coroutineContext = Dispatchers.Main

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        launch {
            findViewById<TextView>(R.id.text).text = withContext(Dispatchers.IO) { get() }
            findViewById<View>(R.id.progress).visibility = View.INVISIBLE
        }
    }

    fun get(): String?{
        return Retrofit.Builder()
            .baseUrl("http://www.mocky.io")
            .build()
            .create(Network::class.java)
            .get()
            //.error()
            .execute()
            .body()?.string() ?: "errore"
    }

}

interface Network {
    @GET("/v2/5d0f88043200005c00dc6a47?mocky-delay=5s")
    fun get(): Call<ResponseBody>

    @GET("/v2/5d0f895a3200003900dc6a4d?mocky-delay=5s")
    fun error(): Call<ResponseBody>
}