使用flutter在webview中显示下载的临时本地文件(png、jpg、pdf、rtf)

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';
import 'package:webview_flutter/webview_flutter.dart';

class LocalFileWebView extends StatefulWidget {
  final String fileUrl;

  LocalFileWebView({required this.fileUrl});

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

class _LocalFileWebViewState extends State<LocalFileWebView> {
  late WebViewController _webViewController;
  late String _localFilePath;

  @override
  void initState() {
    super.initState();
    _downloadFile();
  }

  Future<void> _downloadFile() async {
    final tempDir = await getTemporaryDirectory();
    final fileName = widget.fileUrl.split('/').last;
    final file = File('${tempDir.path}/$fileName');

    // 下载文件
    // 使用http或dio库下载文件到file路径

    setState(() {
      _localFilePath = file.path;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Local File WebView'),
      ),
      body: _localFilePath != null
          ? WebView(
              initialUrl: 'file://$_localFilePath',
              onWebViewCreated: (controller) {
                _webViewController = controller;
              },
            )
          : Center(
              child: CircularProgressIndicator(),
            ),
    );
  }
}