Android release build camera doesn't start at all

[daveshirman]

• mobile_scanner: ^7.0.1
• Android 15 OneUI 7 Samsung

Works absolutely fine in dev / profile mode.

In my release build, I tried doing the following:

final MobileScannerController _cameraController = MobileScannerController(autoStart: false);

//...


@override
initState() {
  super.initState();
  _startCamera();
}

//...

MobileScanner(
  controller: _cameraController,
  onDetect: (barcodeCapture) {
    final String? code = barcodeCapture.barcodes.first.rawValue;
    if (code != null) {
      // Do something..
    }
  },
),


//....


void _startCamera() async {
  WidgetsBinding.instance.addPostFrameCallback((_) async {
    Utils.snackbar('Starting Cam', context);
    if (!_cameraController.value.isStarting) {
      await _cameraController.start();
      Utils.snackbar('Cam ready', context);
    }
  });
}

I never see the second snackbar message.

Release mode running logs:

[        ] E/flutter (24795): [ERROR:flutter/runtime/dart_vm_initializer.cc(40)] Unhandled Exception: MissingPluginException(No implementation found for method state on channel
dev.steenbakker.mobile_scanner/scanner/method)
[        ] E/flutter (24795): #0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:365)
[        ] E/flutter (24795): <asynchronous suspension>
[        ] E/flutter (24795): #1      MethodChannelMobileScanner._requestCameraPermission (package:mobile_scanner/src/method_channel/mobile_scanner_method_channel.dart:148)
[        ] E/flutter (24795): <asynchronous suspension>
[        ] E/flutter (24795): #2      MethodChannelMobileScanner.start (package:mobile_scanner/src/method_channel/mobile_scanner_method_channel.dart:289)
[        ] E/flutter (24795): <asynchronous suspension>
[        ] E/flutter (24795): #3      MobileScannerController.start (package:mobile_scanner/src/mobile_scanner_controller.dart:417)
[        ] E/flutter (24795): <asynchronous suspension>
[        ] E/flutter (24795): #4      _PageHomeState._startCamera.<anonymous closure> (package:menu_scan/home.dart:91)
[        ] E/flutter (24795): <asynchronous suspension>
[        ] E/flutter (24795): 

[wangjunjx8868]

i have a same problem

[navaronbracke]

This sounds like an obfuscation problem? Do you have a proguardrules.pro set up?

[daveshirman]

Update on this:

Flutter has broken plugins with the latest framework update - it's not this plugin only, it's anything. Even with proguard rules it's screwed. Downgrading the Flutter version to 3.29.1 for the moment allows a build with Android minSdk targeting version 35.