下载Flutter中的未知文件扩展名

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

void downloadFile(String url, String fileName) async {
  try {
    var response = await http.get(Uri.parse(url));
    if (response.statusCode == 200) {
      Directory directory = await getApplicationDocumentsDirectory();
      File file = File('${directory.path}/$fileName');
      await file.writeAsBytes(response.bodyBytes);

      // 尝试打开文件
      openFile(file);
    } else {
      print('Failed to download file');
    }
  } catch (e) {
    print('Error downloading file: $e');
  }
}

void openFile(File file) async {
  try {
    if (Platform.isAndroid) {
      await openAndroidFile(file);
    } else if (Platform.isIOS) {
      await openIOSFile(file);
    }
  } catch (e) {
    print('Error opening file: $e');
  }
}

Future<void> openAndroidFile(File file) async {
  String filePath = file.path;
  await Platform.invokeMethod('openFile', {'filePath': filePath});
}

Future<void> openIOSFile(File file) async {
  String filePath = file.path;
  await Platform.invokeMethod('openFile', {'filePath': filePath});
}