Flutter app show grey screen in release mode but works fine in debug mode

Question

I am trying out flutter and currently following this tutorial https://www.youtube.com/watch?v=j6c_vHdbUfg

I notice that the app works fine in debug mode but when I try the apk on my phone the app shows a grey screen after the loading screen. I am not too familiar building apps on mobile and not sure what is causing the issue here. I've tried building the apk using the github project from the tutorial but it also have this issue. https://github.com/iamshaunjp/flutter-beginners-tutorial/tree/lesson-35

Answer 1

It's a Flutter crash.

I had the same issue and solved it by installing SENTRY error logging in my flutter project. It takes me for 30 minutes for installing and fixing :)

Here is a link to flutter official documentation about SENTRY: https://flutter.dev/docs/cookbook/maintenance/error-reporting

P.S. Also watch carefully for imports while installing, because you can have dart:html error. see: Flutter build cannot find 'dart:html'

P.P.S Make sure you app have access to the internet in AndroidManifest.xml if you installing SENTRY

<manifest xlmns:android...>
 ...
 <uses-permission android:name="android.permission.INTERNET" />
 <application ...
</manifest>

Good luck!