android - KOTLIN:android.view.ViewRootImpl $ CalledFromWrongThreadException:只有创建 View 层次结构的原始线程才能触摸其 View

Question

我有以下代码:

    lifecycleScope.launch(Dispatchers.Default) {
        val specialMessage = URL("https://finepointmobile.com/api/inventory/v1/message").readText()
        d("Globby", "The message is: $specialMessage")
        lastSavedProduct.text = specialMessage                //line 41
    }

但是执行时出现以下错误:

ERROR : android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
        at com.example.MainActivity$onCreate$2.invokeSuspend(MainActivity.kt:41)

我尝试将lifecycleScope.launch(Dispatchers.IO)更改为lifecycleScope.launch(Dispatchers.Default)，但不起作用。

Answer 1

如果我正确记得协程，那么以下方法应该起作用:

lifecycleScope.launch { // runs on Main by default
    val specialMessage = withContext(Dispatchers.IO) {
        URL("https://finepointmobile.com/api/inventory/v1/message").readText()
    } 
    lastSavedProduct.text = specialMessage
}