Hey guys! I’m current working on my robotics team ...

# scripting

[WukongRework.exe]

Hey guys! I’m current working on my robotics team for highschool (FTC). This year we migrated to a 100% kotlin code base and i was wondering, Am I able to create custom kts files like something.kts for an android project? I tried originally by doing the same setup as you would for a normal JVM project but I got a gradle exceeded memory error. Is there a way for this to be possible and I just set it up incorrectly or is it not possible as of right now? Thanks 🙏

[WukongRework.exe]

I was hoping to access some FTC specific APIs. To send commands to the robot's hardware such as powering motors or servos.

[mbonnin]

Oops sorry I just deleted my message, I just understood 😅

[mbonnin]

I think that should work ?

[WukongRework.exe]

i remember following the JVM setup, but i have a feeling I dont need some of the specific gradle implementations

[WukongRework.exe]

do you know which dependencies i need to add to the gradle?

[mbonnin]

Really not sure sorry, I thought you wanted to run something like *.main.kts om a device

[mbonnin]

I haven't really used a scripting host.

[WukongRework.exe]

i was hoping to be able to create my own custom kts file type, i remember a kotlinconf doing the same (iirc the file types were turtle.kts and groddle.kts)

[WukongRework.exe]

oh...ok, thanks for the information!

[mbonnin]

This talk ? https://github.com/bamboo/kotlinconf2019

[WukongRework.exe]

yes! exactly that one

[WukongRework.exe]

i tried my best to add all of the stuff to my build.gradle files

[WukongRework.exe]

but this ended up with a gradle memory exceeded error

[mbonnin]

I actually watched this but this seemed very Gradle oriented.

[mbonnin]

You're not planning to run Gradle on an Android device, are you?

[WukongRework.exe]

well i do run a gradle build to build and install to the phone

[mbonnin]

Yep, but that runs on a laptop, right?

[WukongRework.exe]

oh yea your right

[mbonnin]

Where is android involved ?

[WukongRework.exe]

im pushing a compiled version onto the phone

[WukongRework.exe]

i write code in android studio, then build in android studio, and then afterwards i push to the phone through android studio install

[mbonnin]

I understood this talk as a way to hook into Gradle to do something like the Gradle team did with the Kotlin DSL, so not related to calling Android APIs

[WukongRework.exe]

yea, i was hoping to be able to use it as a base line but that died very quickly.

[WukongRework.exe]

i guess, until i hear about official support for android devices, i'll have to shelve this idea

[WukongRework.exe]

thanks for the information!

[mbonnin]

that gets me wondering if it's possible to turn a kts file into a .class file...

[WukongRework.exe]

that would take off the load on the phones memory right? since we are doing that during compilation which is on the laptop

[mbonnin]

No worries, sorry I haven't been super helpful, I should rewatch that talk!

[WukongRework.exe]

i should also rewatch as well XD

[WukongRework.exe]

dont worry about it, this seems to be a very abstract concept that people havent tried out extensively

[mbonnin]

For Android you'd need more than a class file, Android uses its own bytecode format that's called dex

[WukongRework.exe]

that is true, but if we can get to .class its a step in the right direction for sure

[mbonnin]

Sticking with the standard way to do apps feels simpler

[WukongRework.exe]

that is probably a good idea

[Nikky]

Iirc you can use a gradle plugin to compile kts files and then use them from other modules

[WukongRework.exe]

i thought i added the correct gradle plugins but i got a gradle memory exceeded error?

[Nikky]

Then you may need to give gradle more memory to work with

[Nikky]

That can be done in the gradle.properties

[WukongRework.exe]

you see, i would, but im building to a phone, so im limited there

[Nikky]

gradle memory exceeded error

this is something at compile/build time on your laptop though

[gildor]

For Android you’d need more than a class file, Android uses its own bytecode format that’s called dex

Android is able to dynamically load .class files using dexclassloader, so it’s not a problem

[mbonnin]

Looking at https://android.googlesource.com/platform/libcore-snapshot/+/refs/heads/ics-mr1/dalvik/src/main/java/dalvik/system/DexClassLoader.java, it says:

A class loader that loads classes from {@code .jar} and {@code .apk} files
containing a {@code classes.dex} entry.

[mbonnin]

Would that still work with jars containing regular Java6 bytecode?

[mbonnin]

I'm assuming Java8 would not work in all cases because most of it requires desugaring

[gildor]

Java8 will not workl probably, until API 23 (?)

[mbonnin]

But Java6 bytecode will? That class I linked is talking about classes.dex . Is there something that can do Java8 Bytecode -> dex bytecode on device?