suspend fun fetchData() = withContext(Dispatchers.IO) {

  delay(1000)

  " 成功获取数据 "

}

fun main() = runBlocking {

   val result = fetchData()

   println(result)

}

  android:layout_width="match_parent"

  android:layout_height="match_parent">

<TextView

  android:id="@+id/textView"

  android:text="测试⽂本"

  android:layout_width="match_parent"

  android:layout_height="0dp"

  app:layout_constraintTop_toTopOf="parent"

  app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>