监听window的尺寸变化，当不为空时，再runApp；runApp必须先WidgetsFlutterBinding.ensureInitialized()，确保有WidgetsFlutterBinding实例，不然会黑屏

Before Fixing：

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

使用window需导入 dart:ui

import 'dart:ui';

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());
  }
}

参考链接
参考链接