使用kotlin协程处理2.6中的无互联网连接错误
使用kotlin协程处理2.6中的无互联网连接错误
提问于 2019-06-22 15:24:17
我正在使用升级2.6和kotlin协程来进行API调用而不阻塞UI线程，我让它工作了，但当我关闭互联网连接时，应用程序崩溃了。logcat错误为: E/AndroidRuntime: FATAL EXCEPTION: DefaultDispatcher-worker-1
下面是我的代码：
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)
}
}
}回答 3
Stack Overflow用户
发布于 2019-06-23 18:07:37
我已经让代码工作了，新的代码是：
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()
}
}Stack Overflow用户
发布于 2019-11-02 18:28:45
因此，在查看堆栈跟踪时，我发现当网络不可用时会抛出ConnectException
这就是我在kotlin中的做法，对我来说很管用，
suspend fun<T: Any> safeAPICall(call: suspend () -> Response<T>) : T{
val response = try {
call.invoke()
}
catch (e:java.lang.Exception){
e.printStackTrace()
val message = if( e is ConnectException) "Connection Error" else "Something went wrong. Please try again."
throw IOException(ResponseError(message, 500).convertToJsonString())
}
// When connection is OK
if(response.isSuccessful){
return response.body()!!
}else{
val error = response.errorBody()?.string()
error?.let{
val message = JSONObject(it).optString("message", "Something went wrong")
val responseError = ResponseError(message, response.code())
throw IOException(responseError.convertToJsonString())
}
throw IOException(ResponseError("Something went wrong. Please try again.", 500).convertToJsonString())
}
}我使用的数据类
data class ResponseError(val message:String, val errorCode:Int)用法：
try {
val response = safeAPICall {APIClient.planner.viewSites(view.context.authToken)}
}
catch (e:Exception){
view.snack(e.message?.toModel<ResponseError>()?.message?: unspecified_error)
}奖励：
inline fun <reified T> JSONObject.toModel(): T? = this.run {
try {
Gson().fromJson<T>(this.toString(), T::class.java)
}
catch (e:java.lang.Exception){ e.printStackTrace(); null }
}
inline fun <reified T> String.toModel(): T? = this.run {
try {
JSONObject(this).toModel<T>()
}
catch (e:java.lang.Exception){ null }
}Stack Overflow用户
发布于 2019-06-22 16:58:59
而不是这样：
CoroutineScope(Dispatchers.IO).launch {
val res = service.getPostBySlug(slug)
try {
withContext(Dispatchers.Main) {试试这个：
CoroutineScope(Dispatchers.Main).launch {
val res = service.getPostBySlug(slug)
withContext(Dispatchers.IO) {
try {将“try and catch”块代码包装在Dispatchers.IO中，而不是将Dispatchers.IO包装在try块中
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56713483
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