Added onError for when Android fails to initialize the camera

May fail when phone is broken or
if there are no camera with the specs (e.g. aspect ratio)

README.md

@@ -121,6 +121,8 @@ Additionally, the Camera can be used for barcode scanning
 | `torchMode`                    | `'on'`/`'off'`                   | Toggle flash light when camera is active. Default: `off`                                                                                                                                                                                                                                                                                  |
 | `cameraType`                   | CameraType.Back/CameraType.Front | Choose what camera to use. Default: `CameraType.Back`                                                                                                                                                                                                                                                                                     |
 | `onOrientationChange`          | Function                         | Callback when physical device orientation changes. Returned event contains `orientation`. Ex: `onOrientationChange={(event) => console.log(event.nativeEvent.orientation)}`. Use `import { Orientation } from 'react-native-camera-kit'; if (event.nativeEvent.orientation === Orientation.PORTRAIT) { ... }` to understand the new value |
+| **Android only**                   |
+| `onError`          | Function                         | Android only. Callback when camera fails to initialize. Ex: `onError={(e) => console.log(e.nativeEvent.errorMessage)}`. |
 | **iOS only**                   |
 | `ratioOverlay`                 | `'int:int'`                      | Show a guiding overlay in the camera preview for the selected ratio. Does not crop image as of v9.0. Example: `'16:9'`                                                                                                                                                                                                                    |
 | `ratioOverlayColor`            | Color                            | Any color with alpha. Default: `'#ffffff77'`                                                                                                                                                                                                                                                                                              |

android/src/main/java/com/rncamerakit/CKCamera.kt

@@ -326,6 +326,14 @@ class CKCamera(context: ThemedReactContext) : FrameLayout(context), LifecycleObs
             preview?.setSurfaceProvider(viewFinder.surfaceProvider)
         } catch (exc: Exception) {
             Log.e(TAG, "Use case binding failed", exc)
+
+            val event: WritableMap = Arguments.createMap()
+            event.putString("errorMessage", exc.message)
+            currentContext.getJSModule(RCTEventEmitter::class.java).receiveEvent(
+                    id,
+                    "onError",
+                    event
+            )
         }
     }
 

src/Camera.d.ts

@@ -82,6 +82,8 @@ export interface CameraProps {
    * ```
    */
   onZoom?: (event: OnZoom) => void;
+  /** **Android only**. Triggered when camera fails to initialize */
+  onError?: (event: { nativeEvent: { errorMessage: number } }) => void;
   // Barcode only
   scanBarcode?: boolean;
   showFrame?: boolean;