fix(android): initialize CameraDevicesManager after React instance se…

[MdAbubakar]

Summary

Fixes IllegalStateException: Tried to access a JS module before the React instance was fully set up
on Android when using VisionCamera.

The crash occurs because sendAvailableDevicesChangedEvent() is called from the init {} block
before initialize() has been invoked by React Native, meaning getJSModule() is not yet safe to call.

Changes

• Moved cameraProvider + extensionsManager initialization from init {} to initialize().
• Registers AvailabilityCallback only after React instance is ready.

Reproduction Steps

1. Open an app using VisionCamera immediately on app launch.
2. The camera availability event is emitted before React is ready → crash.
3. This fix delays event emission until initialize() is called.

Test Plan

• Verified on Android 12/14 that the crash no longer occurs.
• Camera devices list still populates correctly on startup.

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Name	Status	Preview	Comments	Updated (UTC)
react-native-vision-camera	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 5, 2025 1:45pm

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[pke]

@mrousavy could you please check this? The current RNVC 4.7.2 is crashing production builds right and left. Thanks a lot!

[mattijsf]

This is most likely resolved with #3623 (comment) by updating to https://github.com/mrousavy/react-native-vision-camera/releases/tag/v4.7.3

I think this one can be closed.