MVVM / MVI Repository Pattern with Hilt

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A very simple example using MVVM / MVI, Repository Pattern, Hilt dependency injection, Network layer with Retrofit, Caching layer with Room, Coroutines.
This is a complete example so you can see the big picture when it comes to using Hilt and android architecture.
Code: github.com/mit...
Instagram: / codingwithmitch
Twitter: / mitch_tabian
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#AndroidDev

[@TheAnilmaddala]

This is so useful! and I keep coming back to this. So I created myself a breakdown :) 0:00 Project Setup 3:35 Remote Model creation and Retrofit Setup 12:00 EntityMapper 16:00 Room Setup and Local cache model creation 25:00 Dependency Injection - App + Retrofit 32:05 Dependency Injection - Room 35:00 DataState 38:00 MainRepository creation 43:20 MainViewModel 46:00 MVI 51:30 MainActivity

[@AKAzadanine]

Thanks

[@sheenfabile9460]

This is what im looking for! MVI using flow. Will get membership to support your tutorial. Thank you!

[@aabhishek4911]

Bye bye viewmodelproviderfactory or whatever was your name

[@abrahammathew8658]

ApplicationComponent is GONE Now everyone can use SingletonComponent

[@shwetankbhardwaj3190]

Can you please explain more about Entity mapper. Like, how to map an entity to a global model if we have multiple hierarchies of objects

[@bjugdbjk]

Think in a way like moving data from one class to another class, with the same fields available.

[@johnnyshoesofthetwo7374]

why do you launch inside viewModelScope twice? no explanation?

[@charlien759]

Good video, however with new projects Gson isn't the ideal choice, Jake Wharton says to use kotlinx.serialization, Moshi or Jackson. Moshi is basically Gson V3 in all but name.

[@DartLuke]

25:44 ApplicationComponent was renamed to SingletonComponent

[@bradyaiello6830]

Only "pk" needs the @SerializedName, because it's the only field whose name differs from the JSON response. You also don't need @ColumnInfo unless the field name differs from the column name in your table.

[@codingwithmitch]

Just habit

[@mytubekt]

Very helpful video. Thanks!

[@superjkmax88]

This is an awesome video Mitch! I wish credit cards were available in my country so I could buy a membership on your site. I’ve been reading the courses’ source code on github and failing to understand some concepts fully, this video helped me immensely!

[@jamilxt]

That's what I was looking for. Thank you. ^_^

[@alitonoliveira1700]

Awesome and fast like a bullet :)

[@wisnusuryawardhana7891]

THANKS MITCH!!!

[@lbars]

Yes, exactly what I needed. All architecture concepts at the same video. Thank you CodingWithMitch ❤

[@dahlola]

Nice tutorial! For anyone wondering, "dao" stands for Data Access Object. So in the context of an database it handles the access to the data.

[@edvardgrei1257]

Thank you Mitch. It really opened my eyes. Going to take your paid course for sure. Good Job

[@maksonic_official]

powerful work! Thanks so much for this video, I will definitely go to your site to see the lessons!

[@bro_chenzox]

The most excellent explanation format (a whole hour) - everything from scratch and in order, as in real life, despite the fact that the volume can twitch the eye, but if you do not rush and think about each embedded topic with understanding, it turns out incredibly cool and understandable!!

[@codingwithmitch]

"despite the fact that the volume can twitch the eye" Like the volume of the content or the volume of my audio?

[@bro_chenzox]

@@codingwithmitch Comparing to other Hilt related videos content))

@@bro_chenzox do you still carry that air-compressed gun around?

[@zhanyshmasirov4611]

thank you Matthew(Mitch) , actually english isn't my mother tongue , I'm actually viewing Russian Android developers Channel in youtube , but they're not explaing on begining of project , they're explaining from already done projects and its very heavy to understand if not begin explanation from begining , i'm beginner but I've undertand everything! thank once again. because you've explained from begining in project

[@isaacsufyan]

Why you are using the Blog model you can also use BlogNetworkEntity data class, because both are models and the same variable. We can also get value from BlogNetworkData Model class, why you create separate blog model, Network Wrapper, think its increasing complexity

[@kagankuscu]

Hello Everyone, I have a question if anyone knows it, please share with me. Normally ViewModel when takes an argument it needs ViewModel.Factory but I could not see in this app. Question is When we use DI don't we need to use ViewModel.Factory?

[@jackli1924]

Thank you Mitch，a wonderful video! Your tech is so excellent and your explaination is so consice and awesome!

[@msontrent9936]

Really good tutorial. Far more useful than learning it in a classroom. Thanks for taking the time.

[@minaisaac4529]

that's great...but you are always talking about "suspend" function as if it is responsible for the asynchronous work ...but actually -or what I think - it is only about Stop/Resume actions...also there is no point in using @ColumnInfo in room while the properties are the same letters of the column name besides why do you provide the main repo through a module while you can do this simply through constructor injection?

[@BradleyEdwardAnderso]

@6:24 you say build.gradle "project" file, but I had to use the "module" build.gradle file.

[@christopherelias8022]

Hello, I'm not so sure if this is MVI. It is probably is a very simplified version of It, but I don't know if I could call this MVI. There are no intent to actions, action to result processor, reducers, or even a good definition of the state model. If you use a sealed class for your state model representation, what happens when you resume your activity after an error? or return to a fragment after being saved on the stack. But on the other hand, you are very clear with the things you explain. For those who wan't to know what am I talking about check out this MVI talk: kzbin.info/www/bejne/homliZZ-hsp3gqc "Not everything that shines is gold" -

[@MariusDuna]

Regarding with creating models, you can find JSON to KT data class Android Studio extension. You just paste there the JSON and data classes are created for you automatically

[@rajnikantpandey709]

Hi , at 44:47 min , you said that "i'm not adding @Inject at the constructor of MainRepository , i will provide this in module" but why cann't you do there only by putting the @Inject annotation , why do we need to create a seprate module for that and while i'm trying to put @Inject annotation in constructor itself , its throwing me error.

[@appsdeveloper4024]

This is an awesome video Mitch! I wish credit cards were available in my country so I could buy a membership on your site. I’ve been reading the courses’ source code on github and failing to understand some concepts fully, this video helped me immensely!

[@foivosstamopoulos9709]

PERFECT tutorial! So much knowledge combined. Thank you once again

[@erinwolf1563]

Mitch why didnt u just annotate the constructor of the Repository with @inject.. why did u provide it in a Module ?

[@arulwastaken]

Thank you mitch for wonderful explanation. im working on android almost 2 year with java now i can understand kotline with best approach by watching all your tutorials. I'll suggest your channel and blod and site to colleague.

[@marzaise]

Nice explanation!! but the way you put empty lines in the very bottom of your code gives me OCD 😂

[@amateur_gamer101]

I could literally kiss you for this tutorial 😭😭 its so easy to understand. You just got a new follower.

[@vishwaraghavendra8332]

Omg!! Finally.. Was waiting for this tutorial

[@codingwithsam4992]

Everything successfully went over my head😅

[@bahaaka828]

i really liked it. make more of these kind of videos 1 hour contains the summary of 8 hours course

[@piyush288]

in this approach, what if internet connection is off and we run this application.???

[@cdmunoz]

Awesome job! Thanks for sharing it with all the community

[@ozgurtas4508]

thanks mitch, very good tutorial

[@AnasTariqKhan]

Hey Mitch, first of all, a very helpful tutorial, Just a question, what's the use of caching here? because if the network API fails then we're not retrieving from cache?

[@codingwithmitch]

Just a simple example. Obviously there should be more detailed error handling

[@ankitdubey9560]

Should we observe to database directly in viewmodel, and also call the API. Atleast everytime the loader will not be displayed if data is already in db. However caching functionality is not clear to me.

[@MariusDuna]

ApplicationComponent is deprecated - > SingletonComponent

[@aravind_us]

No words to say....it's awesome tutorial....😍😍😍

[@olufemiezekiel7105]

Just to add, the ApplicationComponent has been deprecated/changed to SingletonComponent. So instead of @InstallIn(ApplicationComponent::class) use @InstallIn(SingletonComponent::class) Nice work @CodingWithMitch

[@veejaygrateja6988]

54:02 How did you get a reference from text (TextView)?

[@codingwithsam4992]

Please correct the sorting of video in the playlist

[@malpv]

Nice tutorial! Thanks! Saludos desde Chile!

[@achmadrizkinurfauzie8466]

is this data saved and show in emulator/device when no connection ?

[@Irshu]

thanks Mitch, finally a terrific tutorial!

[@myyoutubeorel]

Been waiting for an MVI video! Thanks alot:) Quick question Is it legit to use firebase as my backend for an app that will have quite a big user base? I read many different opinions, and I am not sure.. Thanks in advance:)

[@codingwithmitch]

Sure why not

[@tasc4404]

Yea it is a nice tutorial, but caching is not working :(

[@alexandretrew3737]

F***ing great!, super helpful !

[@gamesforu6619]

Is a data class in MVI architecture patten?

[@satnamsingh-qh2si]

why there is mapper and all stuf?

[@pejmanazad5852]

My brain is burning. 🔥

[@Firespirit233]

why? this is quite easy, and mitch is explaining it very well and simple

[@gamesforu6619]

What do you mean of MVI pattern?

[@bjugdbjk]

The best vid to know about modern android development using kotlin,livedata,viewmodel, Hilt and MVi architecture, if the same thing if we want to do with Java and traditional ways..it gonna be 4hrs long r even more...u r awesome Mitch.

[@lbars]

and probably 2 hour for debugging things 😂

[@polarisnation201]

This video is what i need. Thanks you

[@RiccardoGabellone]

Hi sir! Great job 💪🏻 Could I ask you a tutorial on how to pre-populate a Room db using Hilt, by using callback which write local json data inside db? I am having more than one issue on it 😅 thanks in advance!!

[@rsajdok]

Maybe someone explain me. Why MainViewModel.kt was not created as module by "ActivityRetainedComponent" ?

[@federicocreti4699]

Hello Man, I have a question. I never used before MVI pattern. I want to ask: I have a login screen (a fragment) which uses OAuth2 authentication. I used a viewmodel behind this fragment. I created a sealed state class in the ViewModel, in order to manage the state between the fragment and viewmodel. Is correct set the state both from viewmodel and fragment? I mean, there are some states which are managed from the fragment, so I have to set the state from the fragment, and other states which has to be managed from the viewmodel (and through livedate I update/inform the fragment). Is this approach correct? Or the states should be set just from Fragment? Then I have some states for example: data class ValidLoginStateEvent(val sessionClient: SessionClient) : LoginStateEvent() data class NavigateToUserListEvent(val sessionClient: SessionClient) : LoginStateEvent() ValidLoginStateEvent is set by Fragment. In the ViewModel I have this: when (loginStateEvent) { . . is LoginStateEvent.ValidLoginStateEvent -> { bytenerRepository.setSessionClient(loginStateEvent.sessionClient) setLoginStateEvent(LoginStateEvent.NavigateToUserListEvent(loginStateEvent.sessionClient)) } is LoginStateEvent.NavigateToUserListEvent -> { _state.value = loginStateEvent } . . } Is this approach correct?

[@nitinnegi9343]

Awesome.. "YOU NAILED IT"

[@u2gilles]

Thanks Mitch. That was great. Do you have the same kind of video with a Room database containing 2 tables joined by a SQL inner join (external key in one of the table). If not, take it as a suggestion because all tutorials I have seen so far only use single SQL table example. I wonder how to use SQL INNER JOIN query in room and integrate it in a MVVM project.

[@nrsingh7203]

wooooh!! Hats off to you man[Amazing explanation of android components]... I wish I can hit more likes...

[@girishak9404]

Wow that's fantastic video. Thanks Mike.

[@codingwithmitch]

*Mitch*

[@girishak9404]

CodingWithMitch Yes Mitch 😂

[@alexandresantos8232]

I have a question, how do we do this if you're using more complex data classes, for example imagin if "Blog" had another class inside, how would we deal with the data relations?

[@ofirkosto]

Awesome video !! Thank you Mitch you are doing a great work you should be proud of yourself!

[@aalap03]

Superb explanation keep going. Just at 54:55 you can use progressbar.isVisible = isDisplayed to avoid checking if condition and let that view extension method take care of it. :)

[@blattwald7650]

Wow, the first time I really appreciate that youtube has a playspeed configuration - Speeding up the playspeed to x1.5 - you're way too slow.

[@akthamahmed2171]

Awsome 👌 thanks you 🧡

[@adamgardner1986]

Awesome video and thank you. Very helpful. Now to figure out how to test that ViewModel and Flow.

[@gulabpatel7477]

1000 plus salute man. Your explanation methods are so easy. I don't even know and experience In kotlin still I can understand all the things very clear manners

[@lazaroyesid]

Thanks!! well explained !

[@edwin846]

Nice video! Keep it up! One question that I have is what is the reason of using dependency injection when Kotlin object can be called from anywhere of the code. For example, the Retrofit module you created in the video can be called directly in the MainRepository class without any DI dependencies. Thanks

[@datanautastv3188]

I actually fucking love you

[@Serg13975]

Great Tutorial. What should I do if I need to pass a blog as an argument to the viewmodel in case I want to insert it . How can I incorporate it to the MainStateEvent?

[@azamatmahkamov263]

Nice tutorial, very neat. I have one question though, if MVI has State mapper in viewModel, does it mean, we can build very large one viewmodel for the whole application?

[@suren6413]

Am an average developer only. But I have learned a lot by your tutorials. Thanks you a lot Mitch

[@jobz7270]

This excellent, Could you please provide video of Hilt Wth SharedPreference

[@SerarEstaifan]

The best ever! Thank you sir 🙏🏻

[@applombaa6278]

This is something amazing

[@tmpname2838]

Great tutorial I learned a ton, though this tutorial did feel like a speed run. youre going way too fast from one thing to the next, by the time I realize Im falling a bit behind in my coding youre already on a new class and I need to rewind a bit to catch up

[@techno-trickster636]

) how hilt know what retrofit instance to provide when we have more than 1 retrofit builder with different base URL

[@starlite5097]

Can you please explain at 49:57 what the .onEach and .launchIn do exactly? Thanks.

[@benjaminmorales9276]

Hi Mitch, I really appreciate this session, you explained a lot of concepts in an incredible way. Thanks for that!. I would like to ask you if could you create or design a Base Use Case with this approach. I think use Flow makes the things more efficient but, I tried and I could't create a Base Use Case. Could you please show us a way?

[@bryanneuberger5886]

engage

[@codingwithmitch]

what a great engagement

[@matt-g-recovers]

I enjoyed this implementation example. Thanks Mitch

[@pgaurav72]

Hilt is awsome!

[@muhammadsalman4389]

Thanks for MVI ❤️

[@LetrixAR]

This was really useful, thanks. P.S: Add chapters to the video please!

[@arindomghosh3144]

It is supper awesome

[@lovemashup7975]

It is definitely the most useful demo I have ever seen. Thanks Mitch for your contribution, it helps a lot :)

[@jaloliddinabdullaev2310]

Best tutorial for MVI on youtube, thanks

[@codingwithmitch]

Ya man no worries

[@antoniokomangyudistira4150]

Thank you

[@vrajeshhirani]

Have been browsing quite a few tutorials on MVI & Clean Architecture and yours is definitely the one that I enjoyed watching. Your way of teaching is really good and I appreciate your hard work behind this. Thank you so much.

[@gunjotsingh3638]

Huge Help !! 🙌🏻

[@muhammadhumzakhan9888]

Hats off to you 🤝

[@SpaceTimeBeing_]

Perfect tutorial!

[@xxluciferinxx]

thanks for this amazing video! leared a lot from this video.