如何在flutter中显示任何类型的url文件？

dependencies:
  webview_flutter: ^2.0.0

import 'package:webview_flutter/webview_flutter.dart';

class WebViewExample extends StatefulWidget {
  final String url;

  WebViewExample({this.url});

  @override
  _WebViewExampleState createState() => _WebViewExampleState();
}

class _WebViewExampleState extends State<WebViewExample> {
  final Completer<WebViewController> _controller =
      Completer<WebViewController>();

  @override
  Widget build(BuildContext context) {
    return WebView(
      initialUrl: widget.url,
      onWebViewCreated: (WebViewController webViewController) {
        _controller.complete(webViewController);
      },
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('WebView Example'),
      ),
      body: WebViewExample(
        url: 'https://example.com/file.pdf', // 替换为要显示的URL文件地址
      ),
    );
  }
}