Build multiple APKs

Overview

To reduce APK size, generate one APK per CPU architecture (ABI).

For background, see Android’s documentation on APK splits: https://developer.android.com/build/configure-apk-splits

NFC Wallet SDK supports these ABIs:

• armeabi-v7a (32-bit)

• arm64-v8a (64-bit)

When you enable ABI splits, Gradle generates one APK per ABI for your digital wallet application.

The following figure illustrates the building of APK for 32-bit and 64-bit architectures.

Overview of splits for architectures

Size consideration

The SDK AAR contains native .so libraries for all supported ABIs.

• Universal AAR size = size(armeabi-v7a .so) + size(arm64-v8a .so)

• With ABI splits, each generated APK contains only one .so

• 32-bit APK size ≈ size(armeabi-v7a .so) + other application components

Configure your build for multiple APKs

In your app module build file:

• Enable ABI splits so Gradle generates one APK per ABI.

• Expect APK names like appname-abi-buildType.apk (for example, mpa-arm64-v8a-debug.apk).

• If you publish multiple APKs, assign a unique versionCode per APK before uploading to Google Play. See: https://developer.android.com/studio/build/configure-apk-splits#configure-APK-versions

Groovy (build.gradle)

app/build.gradle

android {
    splits {
        // Generate one APK per ABI.
        abi {
            enable true
            reset()
            include "armeabi-v7a", "arm64-v8a"

            // Do not generate a universal APK containing all ABIs.
            universalApk false
        }
    }
}

Kotlin (build.gradle.kts)

app/build.gradle.kts

android {
    splits {
        abi {
            isEnable = true
            reset()
            include("armeabi-v7a", "arm64-v8a")
            isUniversalApk = false
        }
    }
}