Auto-detected APK paths are wrong with multiple flavor dimensions or a custom outputFileName (0.21.0, AGP 9) #505

Description

Human note: Apologies for an llm generated issue but I have proof-read it and verified it as far as I could

Since 0.21.0, findDebugAndInstrumentationApk (FladlePluginDelegate.kt) builds APK paths from AGP's default naming instead of reading the real output location (0.19.0 used ApkVariantOutput.outputFile). This produces non-existent paths in two cases:

1. Multiple flavor dimensions. Flavors are joined with / (flavorPath), but AGP uses the combined flavor name as a single directory.

   • Fladle: build/outputs/apk/something/all/debug/app-something-all-debug.apk
   • AGP: build/outputs/apk/somethingAll/debug/app-something-all-debug.apk
   • Same for the test APK (androidTest/something/all/debug vs androidTest/somethingAll/debug).
   • Not visible with a single dimension (e.g. freeDebug), where both are free/debug.

2. Custom VariantOutput.outputFileName. The file name is always $archivesName[-$flavor][-$abi]-$buildType.apk, ignoring an output file name set via the Variant API:

   androidComponents.onVariants { variant ->
       variant.outputs.forEach { it.outputFileName.set("${variant.name}-$versionName.apk") }
   }

Flank then fails with:

'.../build/outputs/apk/debug/sample-debug.apk' from app doesn't exist

Versions

• Fladle 0.21.0
• AGP 9.5.0
• Gradle 9.9.1

Suggested fix

In findDebugAndInstrumentationApk:

• Use variant.flavorName (combined name) instead of joining productFlavors with / for the directory, for both app and test APKs.
• Use output.outputFileName for the app APK name, e.g.

  config.debugApk.set(
      buildDir.zip(output.outputFileName) { dir, fileName ->
          dir.file("outputs/apk/$appApkDirPath/$fileName").asFile.absolutePath
      }
  )

  (outputFileName is a Property<String> and can be read lazily, so it also picks up values set by callbacks registered after Fladle's.)

Workaround

Set debugApk / instrumentationApk explicitly, e.g. "$buildDir/outputs/apk/somethingAll/debug/*.apk".