如何在Flutter_webview中显示或下载pdf文件？

dependencies:
  flutter_webview_plugin: ^0.3.11

import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';

final flutterWebviewPlugin = FlutterWebviewPlugin();

flutterWebviewPlugin.launch(
  'https://example.com/path/to/pdf/file.pdf',
  withJavascript: true,
  withLocalStorage: true,
  hidden: true,
);

final pdfUrl = 'https://docs.google.com/gview?embedded=true&url=https://example.com/path/to/pdf/file.pdf';

flutterWebviewPlugin.launch(
  pdfUrl,
  withJavascript: true,
  withLocalStorage: true,
  hidden: true,
);

dependencies:
  flutter_downloader: ^1.4.0

import 'package:flutter_downloader/flutter_downloader.dart';

void initState() {
  super.initState();
  FlutterDownloader.initialize();
}

final taskId = await FlutterDownloader.enqueue(
  url: 'https://example.com/path/to/pdf/file.pdf',
  savedDir: '/storage/emulated/0/Download',
  fileName: 'file.pdf',
  showNotification: true,
  openFileFromNotification: true,
);