How to add native code to your app with Expo Modules
Blog post from Expo
Expo Modules allow developers using the Expo ecosystem to integrate custom native functionality into their applications when the existing libraries do not meet their specific needs. The process involves creating a custom native module, such as one for detecting audio routes, which includes steps like setting up a fresh Expo project, using the expo-dev-client package for development builds, and defining JavaScript APIs that communicate with native code on iOS and Android. Developers are guided on integrating native audio APIs from AVFoundation for iOS and AudioManager for Android, with methods to query and listen for audio route changes. The module setup involves managing events to notify JavaScript of changes in audio routes, ensuring efficient resource usage through lifecycle hooks like OnStartObserving and OnStopObserving. Continuous Native Generation (CNG) allows for the efficient management of native projects without committing them to source control, while custom modules are maintained separately within the project. Building locally or using EAS Build provides flexibility in compiling the app, and the process showcases the potential of Expo Modules for extending app functionality with custom native code.
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