Network Timeouts with Kotlin Coroutines

High quality programming courses: codingwithmitch.com/courses
In this video I show you how to handle network timeouts using Kotlin coroutines.
In the past, network timeouts have been notoriously difficult to handle on android. AsyncTask, Executors, Threads, all these components made it very difficult to handle errors when making network requests.
RxJava and LiveData made is slightly simpler, and Kotlin coroutines takes it a step further. With Kotlin coroutines there's many different ways to handle timeouts and cancellations. This is a simple example showing you one of those ways using the "withTimeoutOrNull" coroutine launcher method.
Instagram: / codingwithmitch
code: github.com/mitchtabian/Kotlin...

[@dhruvtatran5744]

"if this is helpful", seriously?
This is surely very helpful. Thanks for the video.

[@gabormiklay9209]

coroutines is just perfect. it will replace a lot of inconvenient stuff.
thx for the series.

[@LuisAguilar-hp3lq]

One of my first android tutorials in my life was one of your videos. The one where you show how to implement an OnClick method for a Button and here I am again, after almost 4 years and 2 jobs as an Android developer, learning how to use Coroutines. Thanks Mitch

[@ChandanYadav-uj1mv]

Thanks man for making these series 👍

[@OggerFN]

10:28
That's why you should never use tight timeouts.
A time out should be of a length that can not be reached when executed correctly.
Using a tight timeout makes stuff time out that was executed correctly but under suboptimal circumstances.
That's usually not your goal.

[@AntonioGonzalezsanchez]

These videos are remarkably good. You're really good.

[@darrenfinch1935]

Thanks so much for the great content. I'm moving my Java project to Kotlin after seeing how much better these Kotlin coroutines are than AsyncTasks 🤢

[@samha1513]

Awesome and thanks for the great content .

[@Since1059]

Best video by you for all the new stuff in Android
Keep Going Good bro, thanks

[@sudhir1274]

Another very useful tutorial. Very well put together and explained. Keep up the good work.

[@kurok1132]

Your tutorial videos are sooooooo useful. Thanks man!

[@bro_chenzox]

Calm and essential. Super!

[@sogodeveloper7015]

Great stuff thanks. Look forward to async/await and more on coroutines 👍

[@abhishektripathi6957]

Love your content and the way you explain.

[@oscarperry641]

Very helpful!! Thank you very Mitch.
You saved my life!!!!

[@bjugdbjk]

Wow..Kotlin owes u buddy...thanks a lot fr this series...

[@harveytai3181]

Awesome, I hope I can get more videos about coroutine

[@VenewebTV]

Very usefull, excellent video regards from Caracas, Venezuela

[@erluxman]

likes it, loves it. wants more.

[@shailendraharinkhede9728]

Cool.. 👍
Make more videos on Coroutines.

[@prasadwalvekar]

Great stuff!!! And also, you look like G-Eazy in the thumbnail of this video

[@codingwithphantom3607]

Love your videos bro

[@ajaykumarvishwakarma4720]

You are doing great job.. :)

[@Sreekantbehera07]

I really like the way u explain..

[@codingwithmitch]

Thanks. I like the way you comment.

[@fahrican9708]

good explanation, thanks!

[@KIRILLINGUSS21]

you're the best!!!!!!

[@RichaHope]

Very helpful.Keep it up.

[@raulastete3035]

excellent videos ! Thanks! :D I will pay for your courses

[@codingwithmitch]

Best money you'll ever spend

[@mohdaquib1638]

Very helpful Sir. Please also add a full fledged course based on MVVM, Coroutines, Dagger and Unit Testing.

[@slkslkful]

Very good video

[@hellosagar]

Can understand withTimeout Vs withTimeoutOrNull
And Love You Sir

[@savin1999]

What a start xD

[@muazzamabbas7656]

@CodingWithMitch Please make more videos.

[@tanvibenmandanaka2694]

Thanks a lot.

[@rahhi9792]

Nice video sir

[@nasiralityagi]

Happy coding.

[@harloom9603]

thanks sir

[@jitendrakumar3385]

Awesome

[@radumarinescu355]

Funny thing, Retrofit supports timeout exceptions so you can actually set a writeTime and it should throw the exception where you need it. But for some unknown reasons, the timeouts never worked for me where they should. What makes it even more sinister is the fact that the timeout exception gets thrown every time I use debugger or profiler, but never actually when I am just running the app. It keeps loading forever. So I did a trick, just like you, with coroutines and delay. I created an extension function where you pass the right context for the scopes (lifecycleScope for activity and viewModelScope for viewModel) and handled my scenarios there. And then I execute the task, if it completes faster than the timeout/delay, I destroy the job with the delay and start the next activity, otherwise I wait for the delay and display a retry button after 14 seconds in case of failure. Kotlin rocks!

[@codingwithmitch]

Yeah I do something similar but in the repository. I had the same experiences with Retrofit timeouts. They didn't work as expected.

[@manishsahu4053]

Firstly thanks for such a great video .
Now , 1 question . While I was trying the above example , I created 2 jobs with via launch() and other via withTimeoutOrNull() , within same single scope inside method fakeApiRequest() AND increased the delay time inside getResult*FromApi() to 3 second each and JOB_TIMEOUT to 4000L . Now when I execute , I see the 2 different jobs running in parallel . And in video u said the 2nd job will execute after the completion of first job . Can you please help me in understanding my concern.
One thing more if you change the order of job , say if you call launch() before withTimeoutOrNull() , we see parallel execution BUT if we call withTimeoutOrNull() before launch() , we see sequential execution !!

[@byran3019]

This is nice and beautiful, looking forward to your new course. Quick question: is the new project using Paging lib from jetpack? I'd love to see using that :)

[@codingwithmitch]

Probably not. I don't like it really. I found it overly complex

[@serggio88888]

perfect!

[@blueheartorangeheart3768]

Are coroutines analogous to contextualized JavaScript Promises?

[@technics6215]

Is there a video about retry with Coroutines?

[@slvinaykumar]

If a suspend function suspends and resumes , how does it runs sequentially in the launch coroutine scope?

[@atifabbasi7358]

how we can manage different jobs like I've a recycler that contains button in each row with state of invite . when I click on button I have an another state that is undo state for that invite .how to undo request within 10 second .?

[@ajitdalvi8969]

Hi Mitch, Can you make video on "Koin" library usage, it's option for Dagger in Kotlin. It would be great if you do so. Thanks for videos really helpful. Happy coding.

[@codingwithmitch]

Yeah I will this year sometime

[@androidpc9656]

why suspend funs?
Are they used only to restrict a fun not to be used outside coroutine scope or other suspend functions ?

[@abhinandvalasseri1294]

bro is there a way to run a task in Coroutines for 5 sec intervals indefinitely. cancelled only when i call cancel function.
currently im doing this with Handler and its post delayed method with a runnable

[@codingwithmitch]

Yep that's very simple. There's a repeat{} builder. You can just put a 5 second delay in it

[@shil331]

In hard times, I enjoy to see the drinking noise from beginning of this video😅😅

[@buzzminkyunghoon3856]

When will Open API Android App lectures be available and how many would be there and approx when will the series end of Open Api?

[@codingwithmitch]

It'll be a big one. The app is much larger than the other courses I've made.
Its hard to say when I'll begin publishing lectures. I'm still designing the app.

[@samo92mx]

Hi, why you dont use ".await"?

[@sayidaliahmedelmi7988]

hi mitch. when you should start the course build rest api with kotlin.......

[@codingwithmitch]

Still building the app.

[@mnouman6736]

Hi Mitch, Please create video using coroutines with Rxjava.

[@codingwithmitch]

You wouldn't use rxjava with coroutines. They solve the same problem. Asychronous work

[@yingxinye4152]

Why does the job get launched in withContext(IO) scope? Why not use CoroutineScope(IO){...} in line 30?

[@yingxinye4152]

And you used CoroutineScope(IO){...} in fakeApiRequest() in Async+Await video, which is different from these code

[@jonykestwil4611]

Хороший)

[@cbnewham5633]

I am not familiar with Kotlin coroutines as yet, but I suspect that the delay() function only guarantees a minimum delay of that number of milliseconds (the docs say it depends on the dispatcher as to how it is timed). Your first run probably amounted to just over 2100ms because the delays were longer than 1000ms.

[@coroutinedispatcher]

The thing is that when using Retrofit for example you don't have to implement a withTimeoutOrNull. That's because the timeout is configured in the library. So perhaps the next video should be (just suggesting) on handling errors in Coroutines (which one of them is SOCKETTIMEOUTEXCEPTION)

[@codingwithmitch]

Retrofit timeout is a pain. It's much easier to handle with Kotlin. You can cancel or timeout at any time and very easy update the UI

[@coroutinedispatcher]

@@codingwithmitch Not really if you use an interceptor. Don't know if you are refering to the same case:
.connectTimeout(100, TimeUnit.SECONDS) .readTimeout(100, TimeUnit.SECONDS) which after build() returns the OkHttpClient.

[@codingwithmitch]

@@coroutinedispatcher yes I know what you're talking about. It's not ideal to use in something like a NetworkBoundResource class as recommended with mvvm architecture in google sample github.com/googlesamples/android-architecture-components/blob/master/GithubBrowserSample/app/src/main/java/com/android/example/github/repository/NetworkBoundResource.kt . At least I've tried and it was not easy to handle the logic. If you have an example I'd love to see. Having a coroutine job pattern with a timeout fits in very nicely.

[@maryamkazemi1307]

Awesome , thanks for this series of tutorial. I have a question. I want to get request to network every 3 seconds and in the some condition stop it. I use coroutines for network request. Except post handler, Is there another way to do this work ?

[@codingwithmitch]

You could just do a while loop with a 3 second delay inside. Then if some condition cancel the job.
while(conditionIsTrue){
launch{
networkMethod()
delay(3000)
}
}

[@maryamkazemi1307]

​@@codingwithmitch I try your solution. But The UI have freezed. I create network request in the this repository : class ProcessRepository @Inject constructor(private val apiService: ApiService) {
val _networkState = MutableLiveData()
val _networkState_first = MutableLiveData()
val completableJob = Job()
private val coroutineScope = CoroutineScope(Dispatchers.IO + completableJob)
private val brokerProcessResponse = MutableLiveData()
fun repeatRequest(processId:String):MutableLiveData{
var networkState = NetworkState(Status.LOADING, userMessage)
_networkState.postValue(networkState)
coroutineScope.launch {
val request = apiService.repeatRequest(processId, token)
withContext(Dispatchers.Main) {
try {
val response = request.await()
if (response.isSuccessful) {
brokerProcessResponse.postValue(response.body())
var networkState = NetworkState(Status.SUCCESS, userMessage)
_networkState.postValue(networkState)
} else {
var networkState = NetworkState(Status.ERROR, userMessage)
_networkState.postValue(networkState)
}
} catch (e: IOException) {
var networkState = NetworkState(Status.ERROR, userMessage)
_networkState.postValue(networkState)
} catch (e: Throwable) {
var networkState = NetworkState(Status.ERROR, userMessage)
_networkState.postValue(networkState)
}
}
delay(3000)
}
return brokerProcessResponse
}
And this is code in my fragment:
private fun repeatRequest(){
viewModel.repeatRequest(processId).observe(this, Observer {
if(it!=null){
process=it.process
if(it.process.state== FINDING_BROKER || it.process.state==NONE){
inProgress(true)
}else{
inProgress(false)
}
setState(it!!.process.state!!,it.process)
}
})
}
private fun pullRequest(){
while (isPullRequest){
repeatRequest()
}
}

[@atifabbasi7358]

@@maryamkazemi1307 have you got any solution for it.?

[@maryamkazemi1307]

@@atifabbasi7358 yes. You could give me your email and i'll send my code for you

[@atifabbasi7358]

@@maryamkazemi1307 sure [e-mail]

[@AhmedAli-jx9ie]

make tutorials about animations please

[@josephtorres7091]

would it be better to use OKHTTP?

[@codingwithmitch]

You still need to use okhttp/retrofit/whatever

[@josephtorres7091]

@@codingwithmitch what i mean is about setting the timeout in OKHTTP instead of setting it in coroutines. which is better? anyways thank you so much to all of your video tutorials. it means a lot for me =)

[@codingwithmitch]

@@josephtorres7091 I prefer coroutines

[@RamanaPtr]

I'm confused, why doesn't Coroutine provide an event listener, I've been browsing about it, all of them are custom listeners, any body here has the same problem?

[@codingwithmitch]

There is a listener. But it's experimental right now: kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-job/invoke-on-completion.html.
I show you how to use it in my powerful android apps with jetpack architecture course: codingwithmitch.com/courses/powerful-android-apps-with-jetpack-architecture/

[@technics6215]

Why println(...) instead of Log.d(...)?

[@savin1999]

Hi sir,
i like the way you debug your code but why don't you simplify further by using the android debugger by putting breakpoints in your code.

[@codingwithmitch]

habit I guess

[@abhiraj.sharma]

268:0 likes ratio
bro you're killing it

[@codingwithmitch]

Check out my flutter video

[@jarimanis6908]

request MultiView Expoxy Library

[@adams3356]

I'm really wondering what is in the mug!🤔

[@codingwithmitch]

Water or tea. If it's after 7pm maybe beer.

[@adams3356]

@@codingwithmitchMitch, are you planning to change to kotlin soon?

[@codingwithmitch]

@@adams3356 already did

[@dhananjaywithme]

Tech Lead Intro? LOL

[@theonlyarjun]

rick and morty