refactor(android): Migrate native module from Java to Kotlin #1239

subhankarmaiti · 2025-07-16T16:19:06Z

Summary

This pull request fully migrates the native Android implementation of the library from Java to Kotlin. This modernization effort aligns the codebase with current best practices for Android development, where Kotlin is the officially recommended language. The migration enhances code safety, readability, and maintainability without altering the module's functionality.

Key Changes

Complete Code Migration:
- All .java source files within the android/src directory have been converted to their Kotlin (.kt) equivalents.
- This includes the core module logic (A0Auth0Module), the package definition (A0Auth0Package), parsers (CredentialsParser, LocalAuthenticationOptionsParser), and architecture-specific specs (A0Auth0Spec).
Updated Build Configuration:
- The android/build.gradle file has been updated to add the kotlin-android plugin and necessary dependencies like kotlin-stdlib.
- The Android Gradle Plugin has been upgraded to a more recent version.
- A new android/gradle.properties file has been introduced to centralize and manage versions for Kotlin, Android SDKs, and other build configurations, making them easier to update.
Code Refinements:
- The new Kotlin code leverages modern language features like null safety, companion objects, and concise syntax, reducing boilerplate and potential for null-pointer exceptions.

This is a pure refactoring initiative. There are no intentional changes to the public API or the behavior of the Android native module. The primary goal is to improve the long-term health and maintainability of the codebase.

- Removed the old Java implementation of A0Auth0Module and A0Auth0Package. - Introduced new Kotlin implementations for A0Auth0Module and A0Auth0Package. - Converted CredentialsParser and LocalAuthenticationOptionsParser from Java to Kotlin. - Updated A0Auth0Spec to Kotlin, maintaining the abstract structure for module methods. - Removed deprecated Java files related to the old architecture. - Ensured compatibility with the new architecture by implementing TurboReactPackage.

…ration and dependencies fix(A0Auth0Module): resolve activity casting issues and simplify domain validation

…into SDK-5699-kotlin-migration

android/build.gradle

android/gradle.properties

android/src/main/java/com/auth0/react/A0Auth0Module.kt

pmathew92 · 2025-07-17T05:34:22Z

android/src/main/java/com/auth0/react/A0Auth0Module.kt

+        private const val INVALID_DOMAIN_URL_ERROR_CODE = "a0.invalid_domain_url"
+        private const val BIOMETRICS_AUTHENTICATION_ERROR_CODE = "a0.invalid_options_biometrics_authentication"
+        private const val LOCAL_AUTH_REQUEST_CODE = 150
+        const val UNKNOWN_ERROR_RESULT_CODE = 1405


nit: lets keep the public properties and private properties ordered together

android/src/main/java/com/auth0/react/A0Auth0Module.kt

android/src/main/java/com/auth0/react/A0Auth0Package.kt

android/src/main/java/com/auth0/react/CredentialsParser.kt

…into SDK-5699-kotlin-migration

…anization

pmathew92 · 2025-07-23T10:41:36Z

android/src/main/java/com/auth0/react/A0Auth0Module.kt

+            })
+    }
+
+    override fun onActivityResult(activity: Activity, requestCode: Int, resultCode: Int, data: Intent?) {


You can delete this method ,if not being used

subhankarmaiti added 3 commits July 15, 2025 14:02

chore: update build.gradle and gradle.properties for improved configu…

ea4e648

…ration and dependencies fix(A0Auth0Module): resolve activity casting issues and simplify domain validation

Merge branch 'master' of https://github.com/auth0/react-native-auth0 …

22dcd3a

…into SDK-5699-kotlin-migration

subhankarmaiti marked this pull request as ready for review July 17, 2025 04:22

subhankarmaiti requested a review from a team as a code owner July 17, 2025 04:22