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我正在尝试使用flutter_downloader在InAppWebView中进行下载。我正在尝试使用InAppWebViewController的onDownloadStartRequest函数从另一个文件访问flutter_downloader下载任务函数**_requestDownload**。但我收到此错误
没有为类型"_WebViewTabState"定义方法"_requestDownload"。（文档）请尝试将名称更正为现有方法的名称，或定义名为"_requestDownload"的方法。

• • 如何使用全局键从_WebViewTabState访问该方法？**

webview_tab. dart，我尝试在其中访问_requestDownload函数：

@override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.white,
      child: _buildWebView(),
    );
  }
InAppWebView _buildWebView() {
    var browserModel = Provider.of<BrowserModel>(context, listen: true);
    var settings = browserModel.getSettings();
    var currentWebViewModel = Provider.of<WebViewModel>(context, listen: true);

    if (Util.isAndroid()) {
      InAppWebViewController.setWebContentsDebuggingEnabled(
          settings.debuggingEnabled);
    }
    //----Other code---
    return InAppWebView(
       key: webViewTabStateKey,
      initialUrlRequest: URLRequest(url: widget.webViewModel.url),
      initialSettings: initialSettings,
      onWebViewCreated: (controller) async {//--code}

      onDownloadStartRequest: (controller, downloadStartRequest) async {
        await _requestDownload(TaskInfo()); //ERROR HERE
      },
    ),
}

downloads_page. dart，其中定义了请求下载（）函数。

class _DownloadsPageState extends State<DownloadsPage> {
  List<TaskInfo>? _tasks;
  late List<ItemHolder> _items;
  late bool _showContent;
  late bool _permissionReady;
  late bool _saveInPublicStorage;
  late String _localPath;
  final ReceivePort _port = ReceivePort();
  //Isolate Code

  //Download Request
  Future<void> _requestDownload(TaskInfo task) async {
    var hasStoragePermission = await Permission.storage.isGranted;
    if (!hasStoragePermission) {
      final status = await Permission.storage.request();
      hasStoragePermission = status.isGranted;
    }
    if (hasStoragePermission) {
      task.taskId = await FlutterDownloader.enqueue(
        url: task.link!,
        headers: {'auth': 'test_for_sql_encoding'},
        savedDir: _localPath,
        saveInPublicStorage: _saveInPublicStorage,
      );
    }
  }
  @override
  Widget build(BuildContext context) {
  }
}