RuntimeConfig

Android SDK has pretty useful tool to define build-time constants in code. You can add custom constants in gradle configuration and they will be added into generated BuildConfig.java class. See more info here https://developer.android.com/build/gradle-tips#share-custom-fields-and-resource-values-with-your-app-code

But this tool has one downside on multi-module project: every BuildConfig parameter change require recompilation for all dependent modules.

BuildConfig is still good for constants that hardly ever change and can bring compile-time optimisations. But it is bad for frequently changed data, like timestamp, git commit hash, build revision, application version etc.

Here RuntimeConfig plugin can shine. It will generate you runtime constants which does not generate ABI-change every time after fields change.

Usage

Plugin generates Kotlin file, so it is required to have Kotlin configured in your module.

Enable plugin:

plugins {
    id("io.github.bomiyr.runtime-config") version "1.0"
}

Then use extension to setup your config:

runtimeConfig {
    field("timestamp", System.currentTimeMillis())
    
    // or with using property:
    fields.put("appField", "\"myValue\"")   // <- String value
    fields.put("appFieldInt", "100")        // <- Int value
    fields.put("appFieldBool", "true")      // <- Boolean value
    fields.put("appFieldPair", "1 to 2")    // <- Expression value
}

All available properties:

runtimeConfig {
    field("timestamp", System.currentTimeMillis())
    fields.put("appField", "\"myValue\"")

    className.set("CustomClassName") // `RuntimeConfig` by default
    classPackage.set("your.custom.package")
    classModifier.set("internal") // Empty (public) by default
}

What is going on

Plugin generates kotlin object inside your build/generated/source/runtime-config directory and adds it as source dir to main sourcet for your android module.