Camera does not work after navigation from one screen to another (Both use MobileScanner) #589
Comments
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@oleksii-tatarintsev have you found any workaround? I'm in the same exact situation |
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Have you tried with what mentioned in this other issue? #539 (comment) @override
void initState() {
controller.stop(); ---> call stop here
super.initState();
} |
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I was just running into a very similar issue and have found a workaround that works for me. instead of defining the MobileScannerController in the Scanner class definition, pass it through as a parameter upon instantiation. this example code may be easier to understand. class MyHomePage extends StatefulWidget {
const MyHomePage({super.key});
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Center(
child: Column(
children: [
TextButton(
child: Text("BARCODE SCANNER"),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => ScannerScreen(
controller: MobileScannerController(
autoStart: true,
),
),
),
);
},
),
],
),
),
);
}
}
class ScannerScreen extends StatelessWidget {
const ScannerScreen({
super.key,
required this.controller,
});
final MobileScannerController controller;
@override
Widget build(BuildContext context) {
return MobileScanner(
onDetect: (data) {
controller.stop();
Navigator.pop(context);
},
controller: controller,
);
}
}as you can see, I create a new controller each time the ScannerScreen is navigated to, and pass it through as a parameter of ScannerScreen. |
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None of the workarounds seemed to work. What ended up working was adding a delay between stopping and starting the controller: Not a great solution, but atleast it works. Im running this on a OnePlus Nord N100 (cheap, old phone) in debug mode. Im guessing that the timeout can be shorter on a newer phone running a production build. |
I think you could just await the controller to stop
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In my case, when scanning the QR I go to a new screen where I perform an action and make a pop to return to the QR scan. |
Every time when i am trying to navigate from one screen to another (both screens use MobileScanner), on the second screen i receive white screen if i do not use autostart and starting/stopping controller by myself. If i use autostart, i receive black screen
Package: mobile_scanner: 3.2.0
iOS Device: iPad Pro 12.9 inch (5th generation)
iPadOS: 16.4
Android Device: Samsung Galaxy Tab S7
Android version: Android 11
Code:
Console: output:
Actual result when autostart false:
Actual result when autoStart true:
Flutter doctor:
RPReplay_Final1681298831.mov
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