我正在使用Flutter在[flutter_webrtc](https://pub.dev/packages/flutter_webrtc)插件上做一个简单的演示应用，遵循[这个](https://www.100ms.live/blog/flutter-webrtc#resources)教程。当我在Chrome上测试时，一切正常，在模拟器上相机图像从未显示，当我在我的Android智能手机上测试时，只有在我锁定（电源按钮）并解锁（再次按电源按钮）设备时相机图像才会出现。
我使用的是Windows 11，Android Studio 2022.1.1 Patch 1，Flutter 3.7.5，Dart 2.19.1 OpenJDK 19.0.2和flutter_webrtc 0.9.23。
现在我的代码如下：
```dart
import 'package:flutter/material.dart';
import 'package:flutter_webrtc/flutter_webrtc.dart';
void main() {
  runApp(const MyApp());
}
class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}
class MyHomePage extends StatefulWidget {
  MyHomePage({super.key, required this.title});
  final String title;
  @override
  State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
  final _localVideoRenderer = RTCVideoRenderer();
  void initRenderers() async {
    await _localVideoRenderer.initialize();
  }
  _getUserMedia() async {
    final Map<String, dynamic> mediaConstraints = {
      'audio': true,
      'video': true,
    };
    MediaStream stream =
    await navigator.mediaDevices.getUserMedia(mediaConstraints);
    _localVideoRenderer.srcObject = stream;
    _localVideoRenderer.srcObject = stream;
    return stream;
  }
  @override
  void initState() {
    initRenderers();
    _getUserMedia();
    super.initState();
  }
  @override
  void dispose() async {
    await _localVideoRenderer.dispose();
    super.dispose();
  }
  @override
  Widget build(BuildContext context) {
    final ButtonStyle style =
    ElevatedButton.styleFrom(textStyle: const TextStyle(fontSize: 20));
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Stack(
        children: [
          Positioned(
              top: 0.0,
              right: 0.0,
              left: 0.0,
              bottom: 0.0,
              child: RTCVideoView(_localVideoRenderer))
        ],
      ),
    );
  }
}

setState(() {
});