How to Rename and Generate all APK & Bundle from Gradle with Product flavour and APK Splits

As per This answer, you can go with Option - Two with minor changes as mention below

splits {
    abi {
        enable true
        reset()
        include 'arm64-v8a', 'x86', 'x86_64'
        universalApk false
    }
}

android.applicationVariants.all { variant ->
    variant.outputs.all { output ->
        // New one or Updated one
        output.outputFileName = "${variant.getFlavorName()}-${variant.buildType.name}-v${versionCode}_${versionName}-${new Date().format('ddMMMyyyy_HH-mm')}-${output.getFilter(com.android.build.OutputFile.ABI)}.apk"
        // Old one
        // output.outputFileName = "${variant.buildType.name}-v${versionCode}_${versionName}-${new Date().format('ddMMMyyyy_HH-mm')}.apk"
    }
}

Also, remove the line from each Flavor's block

// To Change the APK and Bundle Name
archivesBaseName = "${name}-v${versionCode}_${versionName}-${new Date().format('ddMMMyyyy_HH-mm')}"

---

By this, you get the output file name like this

For aFlvour

• Release

aFlavor-release-v5_1.0.5-16Jan2020_21-26-arm64-v8a.apk

aFlavor-release-v5_1.0.5-16Jan2020_21-26-x86_64.apk

aFlavor-release-v5_1.0.5-16Jan2020_21-26-x86.apk

• Debug

aFlavor-debug-v5_1.0.5-16Jan2020_21-26-arm64-v8a.apk

aFlavor-debug-v5_1.0.5-16Jan2020_21-26-x86_64.apk

aFlavor-debug-v5_1.0.5-16Jan2020_21-26-x86.apk

For bFlavor

Similar name as above just change the prefix aFlavor with bFlavor like

bFlavor-release-v5_1.0.5-16Jan2020_21-26-arm64-v8a.apk

For cFlavor

Similar name as above just change the prefix aFlavor with cFlavor and, versionCode and versionName as respected

cFlavor-release-v3_1.0.3-16Jan2020_21-26-arm64-v8a.apk