Gabor Varadi @Zhuinden Twitter profile | Pikagi

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Gabor Varadi

@Zhuinden

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351

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Android dev ~10+ yrs. EpicPandaForce @ SO. An organizer of Android Budapest. Mod in /r/android_devs. DM interesting questions.

Joined March 2013

Don't wanna be here? Send us removal request.

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@Zhuinden

Gabor Varadi

3 years

My talk called "Simplified Android Development using Simple-Stack" about single-activity applications at @androidww_ is now finally available! 🎉🎉🎉 You can watch it on YouTube using the following link:

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Simplified Single-Activity Apps Using Simple-Stack with Gabor Varadi,...

Single-Activity apps have been the officially recommended way to structure Android applications since 2018. However, whether they're simpler to write and mai...

www.youtube.com

@Zhuinden

Gabor Varadi

3 years

Thank you so much @androidww_ for having me, I hope the talk on Simple-Stack (and other navigation approaches) was informative as intended :) The slides are available here:

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@Zhuinden

Gabor Varadi

2 years

I'm excited to see the END of backing properties in Kotlin with Kotlin 1.7.0 once and for all. Never liked backing properties and the _prefix. Always went out of my way to avoid the _. Finally, a new language feature will eliminate any/all need for them. Good news for Kotlin.

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@GakisStylianos

Stylianos Gakis

@GakisStylianos

2 years

`Support having a "public" and a "private" type for the same property` marked as "fixed" here 👀 Excited to be able to use this soon

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Gabor Varadi

2 years

"Screaming architecture" is when you look at the package structure of a project, and it makes you want to scream, right? 😱🤔

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Gabor Varadi

2 years

The time has come, onBackPressed is deprecated #androiddev

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2 years

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Gabor Varadi

2 years

(!!!) People who use Navigation-Compose in Jetpack Compose should be aware of this: If you use Navigation-Compose, you need to pass NavHostController to your composable, instead of creating it as default argument. If you use it as default argument, state restoration won't work.

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Gabor Varadi

2 years

What people call "clean architecture" on Android is merely a fashion trend. There's a new one every 3 years.

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Gabor Varadi

4 months

Make sure you get that Flow from a UseCase that talks to a Repository that talks to a Service that talks to a Datasource that talks to a Dao that talks to a Database that talks to a mental health professional This is TDD (Therapy-Driven Development) #tdd #cleanarch #mandroiddev

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Gabor Varadi

2 years

the main difference between MVVM and MVI explained #androiddev

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Gabor Varadi

2 years

Concepts you need to know and understand in order to work effectively with Jetpack Compose - launched/disposable/side effects - composition/recomposition - key {}, remember(key), rememberSaveable - modifiers (Draw/Layout/ParentDataModifier) - CompositionLocal - stable/immutable

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@Zhuinden

Gabor Varadi

9 months

My experience with updating to Jetpack Compose 1.5.0 stable release - AGP 7.4.2 is not supported, you need AGP 8.1 - AGP 8.1 is not supported by Flamingo, use AS Giraffe - Compose 1.5.0 needs compileSdk 34 Then you use Kotlin 1.9.0 + Compose Compiler 1.5.1, now it seems to work

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@Zhuinden

Gabor Varadi

1 year

A list of actual Android best practices

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Core app quality | App quality | Android Developers

App quality directly influences the long-term success of your app—in terms of installs, user rating and reviews, engagement, and user retention.

developer.android.com

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Gabor Varadi

1 year

Google Associate Android Developers are now officially deprecated 😅

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Gabor Varadi

2 months

When you create DataSource Dao Repository UseCase Helper to "ensure consistency across all data access and implement clean architecture", just to write a string in shared pref

@eloffd

Eloff

2 months

That’s how it feels to write boilerplate code

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Gabor Varadi

1 year

Did you know? Square/Retrofit, the popular REST API client you use in #androiddev today, used to have a Shake Detector.

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Gabor Varadi

2 years

#SOLID principles in a nutshell 😅

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Gabor Varadi

4 years

Those who use Fragments along with either Jetpack Navigation or Simple-Stack will understand. #AndroidDev

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Gabor Varadi

2 years

Not sure who still needs to hear this, but the following Github link is the latest edition of the official Android Clean Architecture repository, as described by the Android Clean Architecture article series Check it for reference on Clean Architecture

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Gabor Varadi

4 years

I am happy to see that there is a new Google Codelabs that shows how to simulate process death (low memory condition) in your application 🤩

Android Basics Compose - Architecture Components | Android Developers

Learn about app architecture and how to use ViewModels, UI State, and StateFlow to build more complex apps.

developer.android.com

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Gabor Varadi

2 years

Some Android devs: "multi-activity apps work perfectly well, there is no reason to ever use single-activity" Multi-activity apps:

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@Zhuinden

Gabor Varadi

3 years

I've published an article on some tips that can make Kotlin code easier to read/understand, and minimize the usage of some potentially cryptic and/or unnecessary and/or less trustworthy constructs (e.g avoiding `?.let {} ?: run {}` as general control flow)

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An opinionated guide on how to make your Kotlin code fun to read and joy to work with

A quick list of tips on how to make your Kotlin code nicer to read and work with.

proandroiddev.com

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Gabor Varadi

2 years

The walls of the "MVI maze" represent - unexpected race conditions - non-cancellable obsolete in-flight requests - state restoration bugs due to saving data and transient state along with the actual state - modelling synchronous function calls with classes - "reducer" complexity

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Gabor Varadi

2 years

clean architecture

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Gabor Varadi

2 years

I don't know why, but this code-snippet is just fascinating to me I feel like it's an accurate representation of Android development in a nutshell

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Gabor Varadi

2 years

@davefarley77 This bug only happens sometimes

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Gabor Varadi

2 years

- Our code needs separation of concerns + We've got separation of concerns at home Separation of concerns at home:

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Gabor Varadi

4 years

If you use LiveData +Kotlin, then it's time to STOP writing `, Observer {})`. Use trailing lambdas. Add this import from lifecycle-ktx and you should be good: `import androidx.lifecycle.observe` .observe(viewLifecycleOwner) { adapter.submitList(it) }

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Gabor Varadi

4 months

Android development is mostly frontend, so with the advent of Compose + "MVI" + Hilt + AndroidX-Navigation i feel this is true #androiddev #mandroiddev

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Gabor Varadi

3 years

I've released a new article on Medium! "Structural and navigation anti-patterns in multi-module and modularized applications: the case against “Android Clean Architecture” and the “domain” module". TL;DR: "Android Clean Architecture" is an anti-pattern.

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Structural and navigation anti-patterns in modularized Android applications

What is Android Clean Architecture? Where is it from? Is it an anti-pattern? If we modularize our apps, how can we navigate between…

proandroiddev.com

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@Zhuinden

Gabor Varadi

10 months

#jetpackcompose #androiddev #mandroiddev 😜😜

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Gabor Varadi

2 years

Compose development experience

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Gabor Varadi

3 years

If anyone is curious, I wrote a long post on Reddit on why I don't like MVP or MVI (and why MVVM is generally preferable in pretty much all cases)

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@Zhuinden

Gabor Varadi

1 year

Jetpack Compose layout that can measure the size of its children From:

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Gabor Varadi

1 year

Article by @IceRockDev on how to avoid unnecessary recompositions and laggy UI when using Jetpack Compose #androiddev Examples: 1.) remember {{ }} lambdas 2.) avoiding ConstraintLayout (it's slower than Row/Column, same as XML) 3.) Argument type stability

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Optimize or Die. Profiling and Optimization in Jetpack Compose

Your brand-new app gets bombarded with user complaints on Google Play about it hanging or slowing down? Follow the tips in this article to…

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@Zhuinden

Gabor Varadi

2 years

This is a question to #androiddev s😉 ❗️ Assuming I were to write a book about Android dev, what is it that you'd feel excited to read about? I'm thinking view-based UI development, lifecycle management, state management, fragments/child fragments, etc. but what about you? 🤔

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Gabor Varadi

2 years

I must say I'm a bit rusty when it comes to writing articles, but it's finally out "Reclaim the reactivity of your state management, say no to imperative MVI" Will this be the final blow to `_state.value = _state.value.copy()`? Only time will tell 😅

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Reclaim the reactivity of your state management, say no to imperative MVI

Do you find yourself chasing for “clean code, clean architecture, clean design, clean state management” yet still feel bogged down in a sea…

proandroiddev.com

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@Zhuinden

Gabor Varadi

2 years

Today's Android development fact - If you don't know about DisposableEffect(key) {} and key(key) {} in Jetpack Compose (despite using Jetpack Compose) Then you should probably learn a bit more about Jetpack Compose first, as you won't be able to write code that works correctly

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@Zhuinden

Gabor Varadi

2 years

basically Dagger, Hilt, Koin and Kodein fighting while most apps are using static singletons

@aschmelyun

Andrew Schmelyun

2 years

The JS ecosystem

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Gabor Varadi

3 years

My favorite error message is Execution failed for task ':project:kaptDebugKotlin'. > A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution > java.lang.reflect.InvocationTargetException (no error message)

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Gabor Varadi

2 years

@LouMorda @t3dotgg I like the idea of replacing "git push" and "git pull", with "git yeet" and "git yoink" respectively

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@Zhuinden

Gabor Varadi

4 years

I've published 'Dagger Magic Tricks: leveraging AssistedInjection to inject ViewModels with SavedStateHandle, and Map-Multibinding to inject Workers in WorkManager using WorkerFactory'. Get it while it's hot! And when it's cold. Should be nice either way.

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Gabor Varadi

3 years

After Android 12+ in the root, onDestroy() will never be called, as finish() will never be called. This also means that Activity-scoped ViewModels will never get onCleared() callback The only reliable callbacks for managing state is onStart/onStop (oddly just like LiveData does)

@TatoKutalia

Merab Tato Kutalia 🇬🇪 - Glory to Ukraine 🇺🇦

3 years

Did you know Android 12 changed that ROOT LAUNCHER activities are no longer finished on the Back press? #AndroidDev #Android12

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Gabor Varadi

6 months

Big news #androiddev ! The team working on Hilt has added support for passing custom CreationExtras to a ViewModel using Assisted Injection. I wasn't really keeping my hopes up, so I'm really happy with this addition to Hilt, now that it is supported.

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HiltViewModel does not support custom CreationExtras as it is not exposed to ViewModelComponentBu...

Currently, ViewModelComponentBuilder is only able to create a SavedStateHandle for a ViewModel, but the idea of CreationExtras is to provide general purpose extras to the ViewModel on creation. If ...

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@Zhuinden

Gabor Varadi

2 years

I didn't know you can do this 🤔

@qwert2603

Alexander Zhdanov

2 years

Here is how extension function with 2 receivers may be created in #Kotlin 1.6.0 while Context receivers are being prototyped.

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Gabor Varadi

1 year

I'm happy to report that I can finally stop complaining about the way SavedStateHandle is used in Now-In-Android. Previously, SavedStateHandle was only used to pass arguments to the ViewModel. 2 weeks ago, a new "Search" feature was added, which uses

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Implement search feature (#685) · android/nowinandroid@b3cdc17

Implement search feature - Add a feature module named "search" - Add a SearchScreen that is navigated by tapping the search icon at the top left corner - Add a data layer tha...

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Gabor Varadi

2 years

Developers: "don't add comments to code that do nothing but do the exact same thing as the function is doing" Also developers:

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Gabor Varadi

1 year

To be honest, I found this funny about Dagger/Hilt (and KAPT-based DI frameworks in general) 😅

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Gabor Varadi

2 years

Android 13 introduces a new runtime permission for posting notifications called POST_NOTIFICATIONS.

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Behavior changes: all apps | Android Developers

Learn about changes in Android 13 that will affect all apps.

developer.android.com

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@Zhuinden

Gabor Varadi

3 years

It appears @VasiliyZukanov was right about `for` loops in Kotlin. Not even Google is exempt from mixing up `..` with `until` 😂

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Gabor Varadi

2 years

it's happening 🥳

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Gabor Varadi

1 year

Time for the 2023 "Good things about Android development" challenge this Monday #androiddev 😉 I really like: how easy it is to position Views in XML layouts with minimal effort using FrameLayout layout_gravity, LinearLayout weight, previews, and being able to define margins. 👍

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@mitch_tabian

Mitch Tabian

1 year

@Zhuinden your 2023 challenge: Say something positive about android development once a week.

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Gabor Varadi

1 year

Apparently, the release of Jetpack Compose has brought us multiple new navigation frameworks to replace Navigation-Compose. Bumble-Tech wrote Appyx, while Slack wrote Circuit. It seems there will be a talk here on YouTube in a few moments about Circuit.

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The Circuit – Compose-driven Architecture for Kotlin and Android |...

Welcome to the latest episode of Talking Kotlin! In this edition, we are thrilled to have Amrita, Kieran, and Zac, as we dive into a detailed discussion on C...

www.youtube.com

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Gabor Varadi

2 years

Android 13 docs on the new Photo Picker API using startActivityForResult/onActivityResult instead of implementing custom ActivityResultContract I guess the docs author of realized that ResultContracts are much trickier than the "deprecated" system APIs 😂

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Photo picker | Android Developers

developer.android.com

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Gabor Varadi

20 days

Adding @ Inject annotation on every single class constructor

@KevinNaughtonJr

Kevin Naughton Jr.

@KevinNaughtonJr

21 days

software engineers adding JavaScript to everything

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Gabor Varadi

4 years

Insightful comment by @jakewharton : `Nullable APIs lead to people doing foo?.bar and wonder why the app silently gets into weird states. It's because they probably wanted foo!!.bar but someone shamed them for !! and requireFoo() was "too much boilerplate"`

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Gabor Varadi

3 years

What an interesting article on how using StateFlows from ViewModels can actually result in trickier code with more edge-cases than using LiveData (even including the liveData { coroutine builder)🤔

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Kotlin’s Flow in ViewModels: it’s complicated

LiveData is still your friend

bladecoder.medium.com

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Gabor Varadi

2 years

I made a promise that I'll make an article on Reactive MVI (which is better than the MVI you're used to Most likely not tomorrow, but likely the day after that 😏

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Gabor Varadi

3 years

Pro-tip: Don't name packages "activities" and "fragments" and "viewmodels".

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Gabor Varadi

2 years

I'm still hearing people claim that "just put your state into a ViewModel, and it will survive the Android lifecycle" but in reality that doesn't handle process death unless you also use SavedStateHandle I had a talk on this April 6th 2021 still relevant

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Reactive State Management with Jetpack • Gábor Váradi

What is state management, and why is it hard? Actually, IS it hard? How can it be made easier by leveraging reactivity? What principles can be followed in or...

www.youtube.com

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@Zhuinden

Gabor Varadi

4 years

I just published "Simplifying Jetpack Navigation between top-level destinations using Dagger-Hilt"

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Simplifying Jetpack Navigation between top-level destinations using Dagger-Hilt

Google created Jetpack Navigation to simplify navigation between destinations (such as fragment destinations) and allow defining logical…

link.medium.com

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@Zhuinden

Gabor Varadi

2 years

Sometimes I wonder why we need 8+ classes to do what web developers can do with a single line of code 🤔 $.get("URL").then((result) -> {}).catch((err) -> {}) The equivalent on Android would be as simple as viewModelScope.launch { api.getUrl().fold(onSuccess={}, onError={}) }

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Gabor Varadi

3 years

Stuck with Dagger-Android? Fret not, I've written an article on how Dagger-Android works, what it solves, and how to structure Dagger Modules for better scalability. TL;DR: do not have an ActivityBuildersModule, FragmentBuildersModule or ViewModelModule.

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Dagger Tips: Guide to using Dagger-Android effectively

Outline of how Dagger-Android works, what problem it solves, and how to use it effectively — if one does not yet use alternatives like…

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@Zhuinden

Gabor Varadi

2 years

@donnfelker 8 updates later & 7 hours later: app finally compiles but crashes on launch

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@Zhuinden

Gabor Varadi

3 years

@VasiliyZukanov I don't think this is true, ViewBinding is pragmatically a safer alternative to findViewById. Jake Wharton created ViewBinding while he worked at Google to save us from Databinding and KAPT - giving us type-safety and null-safety at IDE time (instead of compilation time). 🙏

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@Zhuinden

Gabor Varadi

2 years

A must-read article for all Android developers (from a few years ago) #androiddev

"How should I design my Android application? What kind of MVC pattern should...

"How should I design my Android application? What kind of MVC pattern should I use? What should I use for an event bus?" We often see questions from ... - Dianne Hackborn - Google+

web.archive.org

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@Zhuinden

Gabor Varadi

2 years

Why I don't like the typical data-domain-presentation split, having "both repositories and usecases", clean architecture (as it is generally done on Android) and mvi TL;DR clean architecture is a code fashion trend where people copy code and hope for the best, nothing more. \/

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Gabor Varadi

1 year

Google says they created Compose/Jetpack samples that are meant to show "best practices", But then where is `savedStateHandle.saveable { mutableStateOf() }`?

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Gabor Varadi

2 years

According to this post on Reddit, using Jetpack Compose, it is extremely likely that if you are using the `val (value, setValue) = remember { mutableStateOf(..) }` way to declare a mutable state, then you are also introducing bugs that are hard to debug.

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Gabor Varadi

3 months

I feel like this Compose trick should be out of the box 🤔 #jetpackcompose #androiddev

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Gabor Varadi

2 years

I hope this will finally solve my Jetpack Compose recomposition problems 🤔

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Gabor Varadi

4 years

So I found this guide (on creating custom views using onDraw, and even how to define custom states for views that can be used from inside drawable selector). This is something that's been missing for a very long time.

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GitHub - ZieIony/GuideToCustomViews: The ultimate guide to Android custom views

The ultimate guide to Android custom views. Contribute to ZieIony/GuideToCustomViews development by creating an account on GitHub.

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Gabor Varadi

2 years

thanks android studio

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Gabor Varadi

3 years

I'm so happy to see the Kotlin 1.4.30 release! Not only does it come with sealed interfaces, but it also fixes some performance problems you could run into with type inference. I expect this to greatly increase IDE responsivity! Update your IDE plugin 🔥

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Release Kotlin 1.4.30 · JetBrains/kotlin

CHANGELOG Android KT-42383 HMPP: Bad IDEA dependencies: Missing dependency from p1:jvmAndAndroid to p2:jvmAndAndroid Backend. Native KT-38772 Native: support non-reified type parameters in typeO...

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Gabor Varadi

4 years

MFW: getting a YouTube ad, selling a course that promises to teach idiomatic Kotlin, and they show you the code (yes, the code is from the ad)

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Gabor Varadi

2 years

Google adds that passing the ViewModel to the RecyclerView is not good practice because it's tight couling between the adapter and the ViewModel But then why do they pass a ViewModel to a Composable? 🤔

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@Zhuinden

Gabor Varadi

2 years

"CommonsWare published a series of books on Android application development. All are available now under the Creative Commons BY-SA 4.0 License. All are available for free download as PDF, EPUB, or MOBI/Kindle editions, and some are available to read right from your Web browser."

@commonsware

CommonsWare

2 years

New CommonsBlog post: "Final Books, Free for Everyone"

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Gabor Varadi

2 years

Android UI development goalpost-moving in a nutshell: - "Android UI dev is slow" + "Just use Compose bro" - "I'm already using Compose, still slow" + "Just git gud bro" - "That won't help 3-minute preview rendering" + "Just buy a MacBook Pro M1 bro" - "Actually it doesn't help"

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@Zhuinden

Gabor Varadi

2 years

implementation "androidx.compose.ui:ui-util:$compose_version" You should be using `fastForEach` on your Lists (and `fastMap`, `fastAll`, `fastAny`, `fastForEachIndexed`, `fastSumBy`, etc) inside Composable functions

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Gabor Varadi

2 years

I sure do scream each time I see 1.) top-level "domain" module 2.) UseCases that do nothing but delegate to a "Repository" that does nothing but call 1 suspend fun and that's it 3.) "Repository" interfaces in the "domain" module (if you have them, it's the public API of "data")

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Gabor Varadi

11 months

Google Maps Compose Integration development is inactive since March 30th 2023, while there are plenty critical bugs and crash issues opened. Priorities on issues are no longer set, all issues after April are marked "triage me". Is Google support dropped?

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From the androiddev community on Reddit: Google maps for compose development stalled since March

Explore this post and more from the androiddev community

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@Zhuinden

Gabor Varadi

4 years

Hey all, good news! I can finally post and comment on /r/androiddev again. 🥰

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Gabor Varadi

1 year

Must watch talk from Hadi Hariri and Kevlin Henney on: - overengineering for the sake of adding complexity and not because it's needed ("clean arch") - copypasting "solutions" that solve no real problems - making software development seem more difficult

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Gabor Varadi

3 months

"Why do so many large tech companies have awful apps, and many indie apps are great?" #androiddev

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From the androiddev community on Reddit

Explore this post and more from the androiddev community

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@Zhuinden

Gabor Varadi

1 year

I can't believe I forgot about the "shotgun surgery" code smell, when I was talking about the "Android clean arch" that makes you put 1 responsibility in 5 classes and 3 "layers" in 3 modules, And each time you need to make an edit, you have to edit every single one of them 😅

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@Zhuinden

Gabor Varadi

4 years

Interesting news, apparently now you can contribute to Room and WorkManager through Github, rather than only through the AOSP. In fact, there seems to be a whole new Github mirror to AndroidX Jetpack. Now you can browse the Jetpack source code on Github.

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@Zhuinden

Gabor Varadi

2 years

Thanks to Android Studio Electric Eel, it's possible to find out that by following everyday samples, Jetpack Compose will end up in "recomposition hell" & poor performance. To optimize for runtime performance, either pass function references, or remembering callbacks is needed.

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@Zhuinden

Gabor Varadi

2 years

I feel like we should appreciate `associateBy`, which allows you to easily transform an iterable (list, set, etc) into a Map, using a given property as a key to map against another prop One of the nicest features of Kotlin really is the built-in collection extension functions 👀

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@Zhuinden

Gabor Varadi

1 year

don't create "modules per layer" #androiddev

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@Zhuinden

Gabor Varadi

11 months

You should be able to pass a ViewModel to another ViewModel as a constructor argument. #androiddev

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@Zhuinden

Gabor Varadi

2 years

Compose compiler metrics allow you to determine how many composable functions are restartable or skippable, depending on how many of its arguments are marked stable or immutable

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@Zhuinden

Gabor Varadi

4 years

Here's a good comment by Jake Wharton on why you should beware Mockito taking up too much responsibility, and accidentally hardcoding implementation details in unit tests. Or quoting his words, "Mockito is test cancer. Avoid."

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@Zhuinden

Gabor Varadi

4 years

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@Zhuinden

Gabor Varadi

3 years

I've been hearing complaints such as "LiveData is bound to the UI thread, so you should never use it in a Repository, because your mapping is always on the UI thread". To counter this myth, here is today's extension function. (Snippet with @carbon_app )

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@Zhuinden

Gabor Varadi

2 years

Compose

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@github_skydoves

Jaewoong Eum

@github_skydoves

2 years

The 2022 Android Developer Roadmap supports 11 different world languages in README! 🌍 English, Korean, Arabic, German, Spanish, Turkish, Bahasa Indonesia, French, Portuguese, Khmer, and Vietnamese. Anyone can contribute to support your languages.

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@Zhuinden

Gabor Varadi

2 years

If you're planning to create a fully Compose app, consider looking at Appyx instead of Navigation-Compose. I hear it already supports complex screen transitions, not just hard-coded Crossfade 😏

@SamuelPSarm

Samuel Perez

2 years

Take a look to this amazing article about Appyx that my college @andreyk_nn wrote for @BumbleEng

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@Zhuinden

Gabor Varadi

1 year

Jetpack Compose source code that demonstrates how to manage TextFieldValue in case you need to customize TextField selections.

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@Zhuinden

Gabor Varadi

1 year

Who's excited for the new Simple-Stack 2.7.0 update? 😁 #androiddev After a few days of coding, predictive back support (Android 14, targetSdk 34, android:enableBackInvokedCallback) is finally coming 😉 Migration path is provided from onBackPressed/HandlesBack, of course.

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@Zhuinden

Gabor Varadi

2 years

Using the new `bundle.getParcelable` released in Android T that takes a "Class" parameter is actually bugged, and you should NOT use it, as it crashes at runtime. The fix will not be available in Android 13, therefore this will always remain a trap.

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@Zhuinden

Gabor Varadi

2 years

I updated my Fragment + Compose sample to align with recomposition best practices for optimal performance: - screen layout composable is a top-level composable function, instead of a function of Fragment instance - all input arguments are passed as State

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Update Compose sample to align with Recomposition best practices · Zhuinden/simple-stack@2696648

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@Zhuinden

Gabor Varadi

3 years

you are welcome 😉

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