The Ultimate Dagger-Hilt Guide (Dependency Injection) - Android Studio Tutorial

Dependency injection is a core concept of software development. In this video, I'll show you how you can apply DI in an Android app using Dagger-Hilt.
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00:00 - What is dependency injection?
06:45 - Setting up Dagger-Hilt
08:25 - Setting up the structure
10:39 - Creating a module
17:20 - Injecting into ViewModels
20:15 - Injecting the ViewModel in the UI
21:40 - Creating the application class
24:05 - Two dependencies of same type
26:20 - Binding abstractions
29:58 - Field injection
31:28 - Lazy injection

[@leonardosibela]

Man, first of all, you are THE BEST Android KZbin channel in the whole website. Second, you are just awesome!! You are a great teacher and a very charismatic human being. Last, but not least, I don't know how you don't get tired of making so many great videos. You ARE the best!! Thanks for teaching me so much. It's being a pleasure to have your videos as part of my life.

[@PhilippLackner]

Thank you 🥺🙏

[@John-qt6qk]

This coment is so sentimental

[@emremuhammetengin2085]

The best teacher i have ever seen

[@manuelsilveriof]

This is by far the best explanation of Dagger Hilt I have found online. Not even the official Android Developers' KZbin channels explain it like you do. Thank you so much!!

[@alexeysimchenko7494]

I use dagger/hilt every day but usually as copy/paste so today I decided to finally get known how it works. Your explanation is the best of several that I saw today!

[@priyanshugupta7904]

I am a student I can't buy u a coffee but I can like and share your video with my friends. Amazing Teaching :)

[@shashanknanda7299]

This is the most easy to understand explaination that I've ever found on dagger-hilt till now, you explained each topic very consicely yet clearly

[@moforemmanuel158]

your tutorials are the best because you take time to explain the subtle concepts behind the code which is rare from other tutorials i just had to watch this once the get the whole scope of what DI with Hilt is and it implementations

[@abiodunmoses2638]

I am lost for words already. Man is always hitting the nail on the end. Much love ❤️.

[@mandarpawar1423]

Man, you don't know how grateful I am right now! THANK YOU SO MUCH!!!

[@henrygalvan9333]

broo thank you, "you never actually call these functions, dagger hilt does", cleared up so much for me!

[@harishodzic3274]

I always try to give credit where credit is deserved. And you my man are pure gold. I just stumbled on your content and I'm happy for that. Fast, to the point, full of valuable information. Keep on going this is great. I will subscribe, upvote, like. Wish you a good luck in the upcoming days!

[@tonyalbanese6446]

I still can't believe how terrific these videos are. You explanations are superb. Thank you so much for taking the time to make this content.

[@PhilippLackner]

Thank you, happy to help!

[@attilabacsa2808]

Thank you, excellent content as always. When I decided to switch carrier and become an Android dev, your channel was one of the main sources to learn the basics. Keep up the good work! 💯

[@PhilippLackner]

Awesome, thank you and keep it up! 🙏

[@jagat.jeeban]

You're a great teacher. Hats off to you man!! 🙌 Keep making such types of tutorials on android topics.

[@mohinithakkar2172]

Thank you so much for this! It has covered almost all the features of Dagger Hilt.

[@nantiyachomtee2998]

The quality of your content is incredibly high, awesome stuff!! Thanks a lot!!

[@muyassarabdullah1504]

I always go back to your tutorial because it is very simple and easy to understands from fundamentals point of view

[@daniellubenov827]

Those videos are with the latest and the best practices. Really the best android tutorials out there.

[@PhilippLackner]

🙏🙏🙏

[@rajm2671]

Finallyyy, I learned Dagger-Hilt. Good explanation. Thanks, Philipp

[@maryfrancegonzales9570]

The KING is BACK! Thanks bro!

[@samasama3482]

The perfect explanation of Dagger Hilt I have ever seen! thank you

[@khalidrinaldy3671]

you are the best Kotlin Android Developer's teacher, or maybe the best programming teacher i've ever watched

[@nrg4285]

I normally blast through these tutorials but this one took a solid 1-2 hours because of coding and note-taking at the same time and there was so much good content. For example it takes 7 individual scrolls to get through the notes top to bottom, that's a lot more than usual

[@parulsinghal2k5]

you slayyyed it!!! 30 minutes video covered almost everything for a person who knew only how to use dagger2 👏

[@guitarcat01]

You always teach in a very patient and simple way and all i can do i really thank you SO MUCH for what you're doing! I'd say more than 60% of what i know about android comes from you. This is by far the greatest android development channel on KZbin =) PS: After this video i already implemented Dagger in two of my projects

[@PhilippLackner]

Thanks a lot mate!

[@VinothKumar-oo8ye]

philip lackner, i studied your and workout your Weather app (clean code architecture) course, and i don't understand most of things, then after watching this dependency injection i understand all the doubts i have on the weather app course. super tutorial ;)

[@senk0n]

Oh my, thanks to YOU, it's such an easy to understand and implement simple clean arch project for my CV now

[@tasmanlg]

I have such praise for your content. Thank you so much, truly.

[@codingwithtd5196]

Thanks man. This is one of the best Dagger Hilt tutorials I found.

[@ranjith_uzumaki]

My man teaches me more than what I learnt from a 4 yearbachelor's degree.

[@technics6215]

This is about a tool / library. Tools and libraries will change over time. Most of the things you learn in school won't change. If you are in engineering school you are not there to learn how to make a hole in metal with one particular kind of machine. You don't need a professor fot that. You are there to know why, when and where you have to make that hole.

[@SumriseHD]

​@@technics6215but that opinion is way too nuanced!

[@GoceAnastasovski]

Great video! I finally understood Hilt! I would create a sequel to this video where you focus on unit tests, you write the tests without hilt first and then with Hilt

[@PhilippLackner]

I do have a hilt testing video on my channel :)

[@mymobile550]

Became so curious after watching this tutorial . Just after I implemented this in one of my project including database module.

[@arma6363]

Hilt would be super easy by your teaching, Thanks alot dear philip

[@Langi667]

Your tutorials are extremely helpful, thank you so much!

[@AliAhmad-di5ck]

Thanks a lot, I now can understand DI really well.

[@pablocruz1302]

You are the Best Android development content out there. Thanks for your great content

[@PhilippLackner]

🙏❤️

[@rahulrvp]

Thanks a lot for making this video. Super helpful!

[@user-xm2hf1sb8n]

Best Video in short time. Good content.

[@pqsk]

Great video! Thanks so much for the explanation of this library.

[@behnawm]

Thanks for the great video! Please consider explaining different scopes and lifecycles for the dependencies too.

[@LinaSarkar7307]

its priceless. the slickness and the passion of the devs. priceless. what is cheaper and better than soft? Piracy is NOT the answer if you

[@luckydevil1601]

thank you so much! finally I understood the magic behind this!

[@leonkennedy1267]

Thanks for your videos! It's very helpful! More power to you!

[@Alchemist10241]

This video was the exact info that i have needed.

[@TerminalKid]

dude you're Epic, learning a 'lot of good practices from you which saves me time. 👍👍

[@masmmaw]

love it 💖 still provide complete information and of course free. Thank you.

[@PhilippLackner]

You're so welcome!

[@avinashreddy9565]

Great Explanation!!! Very Easy to understand...

[@PamontBahktar]

You're awesome Philipp, thanks so much for this it's really helpful.

[@lioliknumberone1428]

very interesting and clear tutorial! Thank you very much!

[@saikou_absolute]

this cool . I had the same problem and solved it with your content. good luck with your work.

[@fredericoamigo]

I’m so grateful for all of your brilliant videos on Android development in kotlin and jetpack compose. Thank you so much for this! If I might suggest a future video: how to use foreground location for in a MVVP app using datasource-repository-viewmodel architecture.

[@Hoseinsadonasl-jo4dm]

Really awsome Philipp

[@andinaevitha6950]

ITS REALLY WORKED LOL THANK YOU DUDE

[@musfickjamil2831]

Philipp you look so fresh in new setup..setup looks awesome. we want setup tour

[@Sarthakz99]

I was looking for the same Auth token use case!! Thanks a lot!!

[@genctasbasi]

This guy is a gem.

[@kitcat2449]

Very clear, thanks!

[@BilalBerek-tl3tq]

perfectly explained dude.

[@mithilmehta1501]

Hey Philipp, I am from India and I really love your videos and it helps a lot. Thanks! God bless you and keep up the good work. Your explanation are so simple that even a fresher can understand. 😊

[@RaajKanchan]

Hey Mithil, I am new to Dagger Hilt. Can you help me, I want to pass String value from Activity to an AppModule. How can I do that?

[@mithilmehta1501]

@@RaajKanchan why do you want to pass string to app module from activity? Do you want to pass it to next activity?

[@RaajKanchan]

​@@mithilmehta1501 No, no its just an example. Let me give you the example. ----------------------------------------------------- class Customer @Inject constructor(@CName val customerName: String, private val age: Int) { fun printCustomerDetails() { println("$TAG :: $customerName is $age old") } } @Module @InstallIn(SingletonComponent::class) object AppModule { @Provides @Singleton @CName fun provideCustomerName() = "Mithil Mehta" @Provides @Singleton fun provideCustomerAge() = 24 } @Qualifier @Retention(AnnotationRetention.BINARY) annotation class CName @Inject lateinit var customer: Customer customer.printCustomerDetails() ----------------------------------------- Here in the module I am providing CustomerName and CustomerAge statically. Not dynamically. I just want to learn how can I do that.

[@mithilmehta1501]

@@RaajKanchan bro, you are getting it wrong. This is not something to be passed usong dagger. This data which should be passed either from activity to another Activity or else load from network for that particular screen. Dagger should be used to inject those dependencies which screen requires but doesn't care how it is created. So, as per my understanding your usecase is incorrect.

[@kamrulhuqmaroof113]

Wow man it really works!

[@manishpingale6558]

I understood hilt like never before 🤯

[@chitye-aung]

Awesome! Thank You Philip

[@PhilippLackner]

Welcome!

[@SapphireStudioart]

Great video! Well explained, thank you

[@kamertonaudiophileplayer847]

A very frequently my class functionality requires the context. But it is available only in an activity. So I was really frustrated until watched you video. Now, I just tell - inject! That's it, simple and elegant.

[@winsonmac]

Great sharing! I learned new things from you like @Binds and Lazy Injection

[@user-di3iu9li6c]

Thank you so much for your excellent explanation dude 😀😃😄😁

[@chrisperey561]

you are literally the best

[@bdjobstv8575]

thanks a lot!!! so nice reverb

[@whogashaga666]

Thanks for sharing this video.

[@amirnaderlo3045]

it was so helpful,Thanks

[@toniwincent6653]

You are the best at explaining this so that I understand! Thank you so much! When I get my first job as a developer I will buy you coffey! 🙂

[@PhilippLackner]

Thank you, happy to help!!

[@atelier_mongame4119]

This was so helpful!! Thank you

[@xandrviking1113]

Thanks Philipp 👏🤝

[@MrVipulLal]

Your videos are all amazing 🙏👍👍👌💯

[@coldwolf5050]

Great video, very helpful 👍

[@ojo_lali_ngaji]

great tutorial as always

[@user-uu8rn6wf4u]

luv

[@tarekrefaei90]

Totally Awesome ... Thanks alot ..

[@fsfaysalcse]

Sometimes I thought you might be a superhero 😜 And you Come from a different universe. Best of luck, brother. I am your biggest fan from Coroutines video playlist ❤

[@PhilippLackner]

Thanks man🙏😅❤️

[@realurah]

damn... you are such a good teacher man

[@PhilippLackner]

Thank you!🙏🙏

[@7xFuryPlayz]

now i understand how to use Hilt properly , within my project but i have still some doubts within my mind about clean architecture implementation, hope so i will figure them too . but thanks for this complete video . 🤩☺

[@VV-bo7rx]

Thank You very much!

[@mnouman6736]

lot of love for you bro

[@abacaabaca8131]

The purpose of Dependency Injection is that you can share the same reference to an object even when the objects that wants to share it have different lifetime. For example, if I have 3 classes namely `Time`, `A`, and `B`. let say Time class is used for benchmarking or profiling your program. It can be used to detect how much time each functions/methods are executed at runtime. This means you need to create one single instance of Time class so that A and B can refer to this object. Because, if you create two different objects for A and B , maybe the timing is not continuous and so give wrong result. When you have dependency Injection, you have other class that kind of manage the creation of object and it's lifetime. Meaning, if A and B lives in different lifetime, they still be able to share the same reference to Time instance object. For example, if A is created first, then the dependency Injection will also create Time object. After A is deallocated, the dependency Injection will save the state of this Time object that have some state profiling instance of A. Then Time will get deallocated. Then when B is created, the dependency Injection will create the same object of Time with the same last state for A. Meaning as if Time object is reborn again but with the same state when it was when A is about to die.

[@jafxc2383]

Thank you for sharing!!!

[@burakkarabekir2863]

Nice recap, thx man!

[@PhilippLackner]

Welcome!

[@ashishgautam2842]

bro as i'm seeing my growth, i have seen growth in you too..actually / definitely your ahead me but somewhere i feelled sync between us.

[@kamronqobilov1954]

You are very smart man

[@RahulKumar-un6ur]

Wow....what an amazing,clear and short to the point explanation. Out of curiosity, I would like to ask a question please. Can we keep the AppModule a normal class instead of object? Is it recommend to make a module (of course, not a binding module) object instead of a normal class? I tested and both works. Tons of thanks for your time and this amazing explanation.

[@samsammaniamantap]

this is so helpful

[@saurabhyadav-sz9rx]

It was great!

[@680086]

Very useful video

[@yasserakbbach7342]

My hero ✨️

[@nithinjoseph6097]

Great video ✌️

[@abdomostafa4512]

You're my legend

[@MrMrusman2123]

great and simple🤘

[@georgegichura8848]

Worked, thx

[@gastonsaillen2226]

I think we should use @InstallIn(ViewModelComponent::class.java) since the repository lives inside a ViewModel, in the meantime that we inject the repository inside the ViewModel, hilt will then delete this repository instance when the ViewModel is cleared (onCleared is called, ViewModel is destroyed because its activity/fragment does not need it anymore). If we do it with the SingletonComponent it will be tied up with the Application class you created, and hence, the repository instance will outlive the ViewModel. Another way of not using @Named could be to use @Qualifiers which can be more verbose on for example creating two different okHttp clients Great video Philipp, it contains a lot of excellent suggestions !

[@omkarkshirsagar8812]

first time i saw video i dont get it , after seeing video second time now its crystal clear

[@mohannadyoussef8683]

Thank you so much. you are the best.

[@slotgacor8165]

All the best,