scala-android/sbt-android

An easy-to-use sbt plugin for working with all Android projects

Bjorn Regnell

@bjornregnell

@makingthematrix Would it be possible to implement your scheme in an sbt plugin or is it necessary to use mvn to get your dummy android app to fly?

You mention here https://github.com/makingthematrix/scala_android_dummyapp that there are mvn-plugins that are not available for sbt so my questionb is if it is feasible/possible to port/reimplement those for sbt or if sbt is a dead end for building android apps?

Maciej Gorywoda

@makingthematrix

@rohan-sircar So far it looks like JavaFX is working well for me. But I just started.

@bjornregnell I believe whatever mvn can do, sbt can do better ;) It's certainly not a dead end. It's just that someone needs to write those plugins for sbt. Maybe me in the future.

Maciej Gorywoda

@makingthematrix

But first I want to play a bit with all the usual features of an Android app. If it turns out, for example, that I can't have push notifications, then that's basically a blocker and no sbt plugins will change that.

Bjorn Regnell

@bjornregnell

Aha. Makes sense! It is really nice that you are digging in to this. It's one of the best things that has happened with Scala for Android for a while now :thumbsup: @makingthematrix

Maciej Gorywoda

@makingthematrix

thank you :)

Rohan Sircar

@rohan-sircar

@makingthematrix I just find it interesting that it's possible to make android apps without having to use android sdk or having explicit scala support for android.

Chenai Nakam

@chenakam

JavaFx is an obsolete technology.

Rohan Sircar

@rohan-sircar

Depends on what you mean by "obsolete".

Chenai Nakam

@chenakam

There are a lot of great cross-platform UI technologies out there, the most widely used are flutter, react native. If the official support is not good and the API is not updated in time, it will cause a lot of problems while build.

Chenai Nakam

@chenakam

But in my experience, the Android Native API is the least hassle.

Chenai Nakam

@chenakam

@makingthematrix I can give you a slightly more complicated example if you're interested: https://github.com/dedge-space/assoid, this is a lib project.

https://github.com/dedge-space/assoid/blob/master/src/main/scala/hobby/chenai/nakam/assoid/SampleActy.scala

Maciej Gorywoda

@makingthematrix

@chenakam : Thanks. I'm aware of React Native. I need to learn more about it but my first impression is that there's quite a lot of workaround. Going from Scala I would need Scala.js, then that would be translated to JS, then that would be put in a wrapper, and then that would be compiled. I'm not sure but shouldn't that mean that the result app is not as fast and more bloated than the GraalVM approach?

And funny thing with JavaFX. It actually was deemed obsolete a few years ago, but since it's a separate project now, it looks like there's more work on it than ever.

I'd say I'd give it a try :)

Maciej Gorywoda

@makingthematrix

Anyway, at this moment I don't think these two approaches need to be competitors. Any solution that actually works is good for me.

Rohan Sircar

@rohan-sircar

If JavaFX is "obsolete" then I wonder what that would say about Swing. Given JavaFX is much more featureful than it and yet Swing is used in a major IDE.

It's no react for sure, it doesn't have the corporate backing that it and android have either. But it's open source, relatively actively maintained, and there are things it can do that either of those cannot - good integration with scala for one.

At the end of the day your requirements decide what you should go with, and there are requirements where JavaFX is the right choice.

Chenai Nakam

@chenakam

I wrote about Swing a long time ago, and I think Android Native's UI components are probably the most advanced and appropriate by comparison, especially when combined with Scala/Java. Learning about other UI component libraries is also a waste of time if not necessary.

For reference only.

Maciej Gorywoda

@makingthematrix

@chenakam : I'm kind of disappointed with the current state of Android widgets, tbh. I don't say JavaFX is better, but especially since Android 11 came out, my work is mostly about fixing bugs which are there in our app because the new SDK broke something. I would really like to have an alternative.

By the way, I decided to dig a bit deeper into JavaFX widgets. I want towrite more examples, each one testing one of the main features and Android app should have. The first one (well, second, if I count the dummy one) is based on "Fifty States" from Gluon Mobile samples. It's a scrollable list of European Union countries and Scotland. The flags of countries are being downloaded from Wikipedia in the run time and stored in a file cache.

I also added some notes about problems I faced, how you can write this from scratch, and what next I want to do.
Here's the link to GitHub: https://github.com/makingthematrix/scalaonandroid/wiki/European-Union-(and-Scotland)-example

Ondra Pelech

@sideeffffect

I awesome to hear that one can use Scala to build Android apps again! :tada:
Have you had any experience developing Android apps with Scala and React Native? ( https://slinky.dev/docs/native-and-vr/ )
If yes, how would you compare these two approaches? Scala+Gluon+GraalVM vs Scala.js+Slinky+ReactNative

Maciej Gorywoda

@makingthematrix

@sideeffffect : No, I didn't use React. But the last few years I work on Wire, an encrypted messager, in the Android team. We slowly migrate the codebase to Kotlin, but still 2/3 of it is in Scala (but it's Scala 2.11).

Chenai Nakam

@chenakam

@makingthematrix Android's component library is a bit complicated, due to the legacy issues of various versions.
And I just looked at Gluon and expect it to beat Flutter. It's worth a try.

Maciej Gorywoda

@makingthematrix

yup :)

Shafqat Ullah

@shafqatevo

A bit off-topic: does anyone here have experience with using Akka from a Kotlin Android app? What's the simplest way to go about it?

Shafqat Ullah

@shafqatevo

Our goal is to reuse certain Akka ActorSystems from backend in the Android app code

Maciej Gorywoda

@makingthematrix

@shafqatevo : You probably want to into the Java side of Akka (wow, the sound of it...) : https://developer.lightbend.com/guides/akka-quickstart-java/?_ga=2.162834234.724702319.1611691699-389016145.1611581822

From there it shouldn't be much trouble to use it in Kotlin

Chenai Nakam

@chenakam

直接用 Scala 写 Android app 不好吗？

Maciej Gorywoda

@makingthematrix

Hey,
A month ago I had a talk about Scala on Android on the ScalaLove conference. The video has just been published. And I also turned the transcription into a blog post:
https://makingthematrix.wordpress.com/2021/03/17/scala-on-android/

And here's a direct link to the video: https://youtu.be/i_fWL0tEsVM

Bjorn Regnell

@bjornregnell

coool! great talk! very interesting!!

Bjorn Regnell

@bjornregnell

perhaps this gitter thread should be renamed scala-android as it is about more then "just" the sbt plugin...

Bjorn Regnell

@bjornregnell

@makingthematrix I hope your interesting and enlightening talk will trigger the scala-android community to start experimenting with your stack. I'll have a go when I get some time over!

Maciej Gorywoda

@makingthematrix

@bjornregnell : Hey, thanks! :) I think a Gitter channel is linked to the repository. But if there's enough interest, maybe we can get a channel on one of Discord servers for learning Scala (I know about three already. Happy times.)

Maciej Gorywoda

@makingthematrix

I also made a calculator app https://github.com/makingthematrix/scalaonandroid/tree/main/calculator

It looks like things work pretty well.

Maciej Gorywoda

@makingthematrix

Hey,

We got an #android channel on the "Learning Scala" Discord for all things connected to Scala on Android:
https://discord.gg/XHMt6Yq4

Maciej Gorywoda

@makingthematrix

Aaaand now we also have an #scala-android channel on the official Scala discord: https://discord.gg/jn35GMzG

#Ivan0 -RooT

@ndr0cchiett0_twitter

HI All, I am a kotlin programmer and my colleague working on Scala Android got sick and cannot run his project

I get as cannot resolve R symbol, namely the system does not recognize the resources

SaMkiT Sharma

@samkitsharma_twitter

Hey guys
I came across this hack challenge for enhancing Android Libraries, thought of sharing it with you all, it has a cash prize of up to 10 lakh
I submitted my idea, you guys can also participate.
https://www.incubateind.com/hack/libathon

Ondra Pelech

@sideeffffect

In case you didn't know, there's this open PR
scala/scala#9752

ClassValueCompat to support systems without java.lang.ClassValue
The goal of this commit is to enable systems without java.lang.ClassValue to fall back to other method which does not utilize java.lang.ClassValue while keeping its current behavior as how it is for systems with java.lang.ClassValue. Use of java.lang.ClassValue seems mainly for caching as #7879 introduced, so I ran a related benchmark from one of the commits and got following results
...
This commit combined with #9739 will open Scala 2.13.x to wider range of systems including Android as discussed and demonstrated at users.scala-lang.org/t/scala-2-13-on-android/7235/24

1 reply

Q-Techno

@QTechno1_twitter

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Mini Militia Mod Apk

@StartWeb1_twitter

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