Use Java instead of Kotlin?

[rnikander]

I'm not sure about this, as I may be doing something else that is non-ideal, but it appears to have added about 2.6 MB to my final .aab file. (from 17.3 to 19.6 MB).

I just got this jni-0.22 branch to work with my Android app. I ended up simply adding the CertificateVerifier.kt file directly to my project, since that was easier - required fewer modifications to my gradle files. The class files for that are only a about 25K, so I'm guessing the size change is that it pulled in the Kotlin stdlib. Before this I had only a few .java files in my Android project, for a main activity and a couple other shims/connectors for help via JNI.

Kotlin is great and any normal Android project is going to use it. But when writing the app mainly in Rust like I am, it's not needed.

And 2.6 MB is probably nothing these days, but for Rust, where you can be very lean and mean, it might be nice to be a perfectionist here... ?

[djc]

I sort of agree with your direction here, but the proof will be in the pudding. If you want to submit a PR, we can judge it on its merits.

[complexspaces]

Did you run any stripping/optimizations on the built artifact (and are you using a release build)? I'm curious if that helps remove any of the Kotlin-specific bloat not used directly by the library.

[rnikander]

Yes, it's a release build. I don't understand what Android Studio does by default with stripping. I thought it was doing some. For example, this is set:

buildTypes {
        release {
            isMinifyEnabled = false
            signingConfig = signingConfigs.getByName("debug")
            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
            buildConfigField("boolean", "TEST", "false")
        }

It sounds like there is a chance you'd accept the PR, so I will try porting the file to Java and comparing the binary sizes. I'm working off a branch now, because of the new JNI stuff, so I may wait for that to be released so I have fewer moving parts...