Question

I have read some other topics in stackovwrflow with similar problems, But none is answered. So I m asking here. I am developing an airhockey game using flutter in android studio. Everything is normal in debbuging mode. But when I build a release version, it s not working correctly.

Maybe this informations help:

I tested the app on a Xiaomi which uses android 4. In that device, sometimes the app will open. but most of the time only a black screen appears and nothing else. (about 70% of the time it fails.) An other device is a Samsung galaxy J7 with android 8. In that case, the black screen happens more. (about 90%). The third device is a Xiaomi POCO X3 Pro with android 11. In that case, I could not use the app for just a single time.

The libraries I used are:

 package:flutter/services.dart 
 dart:async 
 dart:math

let me know if you need more information. bye the way you can get code from github to look in case you need.

Answer 1

Before Fixing：

void main() {
  runApp(const MyApp());
}

Please change it to the Following：

If your environment sdk: >=2.x <3.0.0 you can use the following code:

import  dart:ui ;

Future<void> main() async {
  if (window.physicalSize.isEmpty) {
    window.onMetricsChanged = () {
      if (!window.physicalSize.isEmpty) {
        window.onMetricsChanged = null;
        runApp(const MyApp());
      }
    };
  } else {
    runApp(const MyApp());
  }
}

If your environment sdk: ^3.0.0 can use the following code:

Future<void> main() async {
  FlutterView? flutterView = PlatformDispatcher.instance.views.firstOrNull;
  if (flutterView == null || flutterView.physicalSize.isEmpty) {
    PlatformDispatcher.instance.onMetricsChanged = () {
      flutterView = PlatformDispatcher.instance.views.firstOrNull;
      if (flutterView != null && !flutterView!.physicalSize.isEmpty) {
        PlatformDispatcher.instance.onMetricsChanged = null;
        runApp(const MyApp());
      }
    };
  } else {
    runApp(const MyApp());
  }
}

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