Uninitialized CameraController after closing and opening the application #133
Description
E/flutter (14891): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: CameraException(Uninitialized CameraController, startImageStream was called on uninitialized CameraController.)
E/flutter (14891): #0 CameraController.startImageStream (package:camera/camera.dart:438:7)
E/flutter (14891): #1 CameraMlVisionState._start (package:flutter_camera_ml_vision/flutter_camera_ml_vision.dart:148:23)
E/flutter (14891): #2 CameraMlVisionState.build. (package:flutter_camera_ml_vision/flutter_camera_ml_vision.dart:308:11)
E/flutter (14891): #3 VisibilityDetectorLayer._fireCallback (package:flutter_widgets/src/visibility_detector/src/visibility_detector_layer.dart:268:24)
E/flutter (14891): #4 VisibilityDetectorLayer._processCallbacks (package:flutter_widgets/src/visibility_detector/src/visibility_detector_layer.dart:239:13)
E/flutter (14891): #5 _TaskEntry.run. (package:flutter/src/scheduler/binding.dart:80:34)
E/flutter (14891): #6 Timeline.timeSync (dart:developer/timeline.dart:163:22)
E/flutter (14891): #7 _TaskEntry.run (package:flutter/src/scheduler/binding.dart:77:16)
E/flutter (14891): #8 SchedulerBinding.handleEventLoopCallback (package:flutter/src/scheduler/binding.dart:460:15)
E/flutter (14891): #9 SchedulerBinding._runTasks (package:flutter/src/scheduler/binding.dart:438:9)
E/flutter (14891): #10 _rootRun (dart:async/zone.dart:1182:47)
E/flutter (14891): #11 _CustomZone.run (dart:async/zone.dart:1093:19)
E/flutter (14891): #12 _CustomZone.runGuarded (dart:async/zone.dart:997:7)
E/flutter (14891): #13 _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:1037:23)
E/flutter (14891): #14 _rootRun (dart:async/zone.dart:1190:13)
E/flutter (14891): #15 _CustomZone.run (dart:async/zone.dart:1093:19)
E/flutter (14891): #16 _CustomZone.bindCallback. (dart:async/zone.dart:1021:23)
E/flutter (14891): #17 Timer._createTimer. (dart:async-patch/timer_patch.dart:18:15)
E/flutter (14891): #18 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:397:19)
E/flutter (14891): #19 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:428:5)
E/flutter (14891): #20 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)
E/flutter (14891):
class FaceVision extends StatefulWidget {
@override
_FaceVisionState createState() => _FaceVisionState();
}
class _FaceVisionState extends State<FaceVision> {
List<Face> _faces = [];
final _scanKey = GlobalKey<CameraMlVisionState>();
CameraLensDirection cameraLensDirection = CameraLensDirection.front;
FaceDetector detector = FirebaseVision.instance.faceDetector(
FaceDetectorOptions(
enableTracking: true,
mode: FaceDetectorMode.fast,
),
);
@override
Widget build(BuildContext context) {
return CameraMlVision<List<Face>>(
key: _scanKey,
resolution: ResolutionPreset.max,
cameraLensDirection: cameraLensDirection,
detector: detector.processImage,
overlayBuilder: (c) {
return CustomPaint(
painter: FaceDetectorPainter(
_scanKey.currentState.cameraValue.previewSize.flipped, _faces,
reflection: cameraLensDirection == CameraLensDirection.front),
);
},
onResult: (faces) {
if (faces == null || !mounted) {
return;
}
setState(() {
_faces = faces;
});
sl<RecognitionBloc>()..add(NewFaces(faces: _faces));
},
onDispose: () {
detector.close();
},
);
}
@override
void dispose() {
super.dispose();
}
}