Android Error on startScan method.

[CntDoit]

Hello! Thank you for this plugin, we've been waiting for something like this! We need to scan multiple code128 barcodes without the camera view closing.

So I followed your setup guide. but im getting an error on Android:
Uncaught (in promise): Error: Attempt to invoke virtual method 'androidx.camera.core.Preview$SurfaceProvider androidx.camera.view.PreviewView.getSurfaceProvider()' on a null object reference

I'm using the startScan method example:

 const startScan = async () => {
   document.querySelector('body')?.classList.add('barcode-scanner-active');

   const listener = await BarcodeScanner.addListener('barcodeScanned', async 
      result => { console.log(result.barcode); });

   await BarcodeScanner.startScan();
};

I'm getting this error when using startScan method. If i use the scan method (which would be ideal because it has the UI already made) this does not happen. It scans and closes out the camera view.

const scan = async () => {
  const { barcodes } = await BarcodeScanner.scan({
    formats: [BarcodeFormat.Code128]
  });
  return barcodes;
};

How can i use the scan method to not close and keep scanning barcodes?

Thanks in advance for your help.

[robingenz]

I'm very glad you found the plugin. I am sure we will find a solution.

Does this error also occur with the ML Kit Demo App?

[CntDoit]

Oh nice, i didnt know there was a demo app, I didnt see a link for it in the barcode plugin read.me file. Anyways, I tested it out and I clicked on start scan but theres just a black screen, and no errors show in console. please see quick video: https://recordit.co/6uUC3OpIrs

The scan options does work just like on my app. Not sure if this matters but on im a pixel 4a Android 13.

[robingenz]

Oh nice, i didnt know there was a demo app, I didnt see a link for it in the barcode plugin read.me file.

Oh, my bad. I will add it. Did you request permissions?

Edit: The scan() method does not require permissions, but the startScan() method does.

[CntDoit]

Update: so the black screen is because i needed to click on the request permissions first. It's showing now and it is scanning the barcode but it closes, right after. I will see what the demo app has done differently then my app. Thank you for the quick response and your help! Have a great day!

[robingenz]

Great, let me know if you have any other questions.