comptaplan_app/lib/main.dart

import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';

void main() {
  const title = String.fromEnvironment("APP_TITLE");
  const uri = String.fromEnvironment("APP_URI");
  const color = String.fromEnvironment("APP_COLOR");
  runApp(const MyApp(title, uri, color));
}

class MyApp extends StatelessWidget {
  final String _title;
  final String _uri;
  final String _color;

  const MyApp(this._title, this._uri, this._color, {Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    MaterialColor materialColor = this._getMaterialColor(this._color);
    return MaterialApp(
        title: this._title,
        theme: ThemeData(primarySwatch: materialColor),
        home: WebView(
          initialUrl: this._uri,
          javascriptMode: JavascriptMode.unrestricted,
        ));
  }

  MaterialColor _getMaterialColor(String colorString) {
    switch (colorString) {
      case "blue":
        return Colors.blue;
      case "red":
        return Colors.red;
      case "green":
        return Colors.green;
      case "yellow":
        return Colors.yellow;
      case "teal":
        return Colors.teal;
      default:
        return Colors.blue;
    }
  }
}