Question 1

How do I add custom native iOS code to a Codename One app?

Accepted Answer

Codename One provides portable abstractions for native integrations. You can write Objective-C code and expose it to Java/Kotlin via cn1libs. The documentation includes guides on creating native interfaces and binding them to your project.

Question 2

Codename One vs React Native: which has better performance?

Accepted Answer

Codename One compiles to true native binaries, offering performance comparable to native apps, while React Native uses a JavaScript bridge that can introduce overhead. However, React Native has a larger community and faster update cycles for new features.

Question 3

Can I use Kotlin instead of Java with Codename One?

Accepted Answer

Yes, Codename One fully supports Kotlin for development. The framework can compile Kotlin code to native executables across all supported platforms, as mentioned in the README's Kotlin support section.

Question 4

How to debug a Codename One app on a physical Android device?

Accepted Answer

Use the simulator for initial debugging, then deploy to a device via the build server. Codename One generates standard Android projects, allowing you to use Android Studio's debugging tools for deeper inspection on real hardware.

Question 5

Is Codename One good for building games?

Accepted Answer

While Codename One provides full pixel control and native performance, it's not specifically optimized for gaming. For complex 2D/3D games, engines like Unity or LibGDX might be more suitable, but simple games can be built with Codename One.

Question 6

How to integrate a REST API in Codename One?

Accepted Answer

Codename One includes networking libraries for HTTP requests. Use the ConnectionRequest class to handle REST calls, and the network monitor tool in the simulator to debug requests and responses efficiently.

Codename One

What is Codename One?

Overview

Use Cases

Best For

Related Projects

Found a gem we're missing?

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions