android - 使用 kotlin 协程处理 retrofit 2.6 的无互联网连接错误

Question

我正在使用带有 kotlin 协程的改造 2.6 来进行 API 调用而不阻塞 UI 线程，我成功了，但是当我关闭互联网连接时应用程序崩溃了。 logcat 错误是:E/AndroidRuntime: FATAL EXCEPTION: DefaultDispatcher-worker-1

这是我的代码:

private fun handleIntent(slug: String) {
    val service = UtilityMethods.migrationTimeService()

    UtilityMethods.showView(loading_view)
    UtilityMethods.hideView(network_error_msg)

    CoroutineScope(Dispatchers.IO).launch {
        val res = service.getPostBySlug(slug)

            try {
                withContext(Dispatchers.Main) {

                    //Do something with response e.g show to the UI.
                    val post = res.body()!!.first()

                    UtilityMethods.hideView(loading_view)

                    val title = post.title?.rendered
                    val content = post.content?.rendered
                    val imageUrl = post.jetPackFeaturedMediaUrl

                    title_txtView.text = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
                        Html.fromHtml(title, Html.FROM_HTML_MODE_COMPACT).toString()
                    else
                        Html.fromHtml(title).toString()

                    content_txtView.loadData(content.toString(), "text/html", "UTF-8")

                    Picasso.get().load(imageUrl).fit().centerCrop().into(thumbnail_imgview)
                }

            } catch (e: HttpException) {
                UtilityMethods.showView(network_error_msg)
            } catch (e: Throwable) {
                Toast.makeText(this@PostContentActivity, "Ooops: Something else went wrong", Toast.LENGTH_LONG)
            }
    }
}

Answer 1

我的代码可以工作了，新代码是:

private fun handleIntent(slug: String) = GlobalScope.launch(Dispatchers.Main) {
    val service = UtilityMethods.migrationTimeService()

    UtilityMethods.showView(loading_view)
    UtilityMethods.hideView(network_error_msg)

    try {
        val res = withContext(Dispatchers.IO) {
            service.getPostBySlug(slug)
        }

        //Do something with response e.g show to the UI.
        val post = res.body()!!.first()

        UtilityMethods.hideView(loading_view)

        val title = post.title?.rendered
        val content = post.content?.rendered
        val imageUrl = post.jetPackFeaturedMediaUrl

        title_txtView.text = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
            Html.fromHtml(title, Html.FROM_HTML_MODE_COMPACT).toString()
        else
            Html.fromHtml(title).toString()

        content_txtView.loadData(content.toString(), "text/html", "UTF-8")

        Picasso.get().load(imageUrl).fit().centerCrop().into(thumbnail_imgview)
    }
    catch (e: HttpException) {
        Toast.makeText(this@PostContentActivity, "Exception ${e.message}", Toast.LENGTH_LONG).show()
    }catch (e: IOException) {
        UtilityMethods.hideView(loading_view)
        UtilityMethods.showView(network_error_msg)
    } catch (e: Throwable) {
        Toast.makeText(this@PostContentActivity, "Ooops: Something else went wrong ${e.message}", Toast.LENGTH_LONG).show()
    }
}