用MaterialApp小部件 Package Scaffold小部件

在我的设备上运行你的代码并没有重现你在屏幕截图中显示的重复按钮问题，但我收到了一个No Directionality error：

然后，我注意到您没有将Scaffold与MaterialApp小部件 Package 在一起。请参见Flutter documentation
所以我所做的就是用MaterialApp小部件 Package Scaffold小部件，并更改将Scaffold小部件插入home的参数。

return MaterialApp(
  home: Scaffold(
//...The rest of the code

所以你的整个main.dart代码应该看起来像这样：

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
class HomePage extends StatefulWidget {
  const HomePage({super.key});
  @override
  State<HomePage> createState() {
    return _HomePageState();
  }
}
class _HomePageState extends State<HomePage> {
  final Completer<GoogleMapController> _controller = Completer();
  static const LatLng curLoc = LatLng(9.970630, 76.425110);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          toolbarTextStyle: const TextStyle(color: Colors.white54),
          title: const Center(
            child: Text('Route Prediction'),
          ),
        ),
        body: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Container(
              margin: const EdgeInsets.only(top: 10),
              height: 300,
              child: GoogleMap(
                initialCameraPosition:
                const CameraPosition(target: curLoc, zoom: 10),
                markers: {
                  const Marker(markerId: MarkerId("You"), position: curLoc)
                },
              ),
            ),
            const SizedBox(
              height: 30,
            ),
            Row(
              crossAxisAlignment: CrossAxisAlignment.center,
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                ElevatedButton(
                  onPressed: () {},
                  child: const Text('General User'),
                ),
                const SizedBox(
                  width: 5,
                ),
                ElevatedButton(
                  onPressed: () {},
                  child: const Text(
                    'Emergency Vehicle',
                    style: TextStyle(fontSize: 15),
                  ),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}

有了这个，你的应用程序应该很好：

我希望这对你有帮助！