android - 从协程更改布局

Question

协程启动

GlobalScope.launch(){
    get_message_pulling()
}

我需要从中编辑布局get_message_pulling()，但出现错误

android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

标签： androidkotlinkotlin-coroutinescoroutine

Answer 1

因为GlobalScope.launch()在不指定协程上下文的情况下使用将在后台线程上运行您的代码Dispatchers.Default，而不是 MainThread，您只能通过 MainThread 协程的上下文与 UI 通信

GlobalScope.launch(){
   get_message_pulling()

    withContext(Dispatchers.Main) {
       // then update the UI 
    }
}