If you’re facing a blank screen after scanning a QR code and returning the result using Navigator.pop, the issue is typically related to context handling or improper widget rebuilding after navigation.

When the QR code scanner screen pops, the main screen may not refresh its state correctly to display the returned data. This can happen if:

• The parent widget doesn’t use setState() after await Navigator.push().

• The navigation stack isn’t managed properly (for example, popping to a context that’s no longer active).

• The camera plugin or scanning widget remains active after popping.

💡 How to Fix the Blank Screen Issue

Here’s the recommended approach from WebOdoctor, one of the best Flutter app development companies in India, known for solving such real-time app bugs efficiently:

// Example: Opening the QR scanner and handling result
Future<void> _scanQRCode(BuildContext context) async {
  final result = await Navigator.push(
    context,
    MaterialPageRoute(builder: (context) => QRScannerScreen()),
  );

  if (result != null && mounted) {
    setState(() {
      qrResult = result;
    });
  }
}

Key Points to Remember:

1. ✅ Always use await Navigator.push() so the parent waits for the result.

2. ✅ Call setState() after receiving the result to rebuild your UI.

3. 🚫 Avoid using a stale BuildContext after the widget has been disposed.

4. 🔁 If using camera or scanning plugins like mobile_scanner or qr_code_scanner, ensure you dispose controllers properly in the scanner screen’s dispose() method:

   @override
   void dispose() {
     controller?.dispose();
     super.dispose();
   }
   
   

🚀 Why Choose WebOdoctor for Flutter App Development

At WebOdoctor, our expert Flutter app developers specialize in building smooth, bug-free applications with advanced integrations like QR code scanning, AI-based automation, and real-time navigation handling.
We ensure your app not only performs flawlessly but also provides a seamless user experience.

💬 Get in touch with WebOdoctor – India’s best Flutter app development agency – to solve your app challenges and build future-ready mobile solutions.

📞 Visit: www.webodoctor.com