Hey all. Anyone have any insight as to why `R` is ...

# android

[Shan]

Hey all. Anyone have any insight as to why R is giving me an unresolved reference error? edit: The solution was to downgrade the Android Gradle Plugin to 3.2.1 from 3.3.0 in Intellij, as there were some breaking changes that were not brought over.

Untitled.kt

[Jacques Smuts]

doesn’t look like you’re importing R

[Jacques Smuts]

import com.yourpackage.app.R

[Shan]

It doesn't show as being able to import R when I manually import it

[Jacques Smuts]

have you done the clean+invalidate_caches rigmarole?

[Shan]

Yeah, multiple times 😞 refreshed dependencies too

[Jacques Smuts]

I am 100% sure I’ve been in this situation and I cannot remember how I resolved it 🤔

[Grzegorz Matyszczak]

remove ./idea/libraries folder in your project then invalidate caches + restart android studio and sync project with gradle, for me it usually helps 😉

[ubububu]

File > Sync Project with Gradle Files

[Shan]

@ubububu have tried that, did not work

[Shan]

@Grzegorz Matyszczak did not work unfortunately

[ribesg]

It probably means your R.java cannot be compiled, you probably have an invalid resource or something. Check your recent changes on resources.

[Slava Glushenkov]

Try to delete {projectDir}/.idea/libraries than File -> Sync Project with Gradle Files.

[louiscad]

Which IDE on which version are you using? Does it compile with gradle from CLI when you add the import manually?

[Shan]

@ribesg I did look at my resources, I don't see any visible errors anywhere 😣

[Shan]

@louiscad I'm using Intellij 2018.3.5. It does not compile when I add the import manually from the IDE or CLI

[ribesg]

@Shan I think you’re using the 3.3 version of the Android Gradle Plugin. Try to rollback to 3.2.1

[paulex]

Well, @ribesg , I use
classpath 'com.android.tools.buildG3.3.2'

[paulex]

and i don't have that issue

[ribesg]

@paulex and you’re using Android Studio

[paulex]

Yes of course

[ribesg]

That’s the issue. 3.3 isn’t compatible with IntelliJ IDEA right now

[ribesg]

Or rather, IntelliJ IDEA isn’t compatible with 3.3. There was a coordinated change between Android Studio and the Android Gradle Plugin on how R is built that was not made in IntelliJ IDEA. I also didn’t check if it was fixed in a recent version of IDEA or in the Android Gradle Plugin 3.3.1 or 3.3.2, as I’m still on 3.2.1 for now.

[paulex]

oh okay... so this is intelliJ? as in that is what she uses?

[ribesg]

Yes https://kotlinlang.slack.com/archives/C0B8M7BUY/p1553770102006100?thread_ts=1553764355.001900&cid=C0B8M7BUY

[paulex]

Oh, Okay seen.

[Shan]

@ribesg downgrading to 3.2.1 solved it 🙂 Thanks so much! That was driving me bonkers

[ribesg]

Now I’m wondering if there’s a task we could track to know when we IDEA users will be able to update to 3.3.x

[Shan]

Can't seem to find one, so this means I will resort to my tried and true strategy of shifting the version up every few days or so and see if it compiles 👍

[louiscad]

Don't use AGP 3.3, it makes your release apps (post R8 processing) crash on KitKat. Use 3.2 with proguard, use 3.3 with R8 explicitly disabled on IntelliJ 2019.1+, or use Android Studio 3.4+

[ribesg]

@Shan it’s a good strat but I always fail to remember why I wasn’t updating. For example I know that there is a problem with Gradle 5.2.1 that prevents me from upgrading from Gradle 5.1.1 but I can’t remember which one

[ribesg]

And now I don’t know if Gradle 5.3 fixed the problem because I don’t remember what the problem was 😛

[Shan]

I generally create an issue on git describing exactly what's preventing me from upgrading to track that kinda stuff 🙂 at least I sometimes do. usually i just forget

[louiscad]

@ribesg It is multiplatform gradle plugin compatibility. Will be fixed in 1.3.30, so you can upgrade to 5.2.1 or maybe 5.3.1 if it's compatible with non preview gradle metadata.

[ribesg]

Oh right, thanks