Flutter 从 Google Drive 和 One drive 下载部分文件

Question

Flutter 无法从 Google Drive 或 OneDrive、zip 或其他方式下载文件。 这些文件只是被部分下载，而来自网站等的大多数其他链接的文件被完全下载。

例如，这个 Google Drive 链接只会获得 10% 的文件下载，但小说的其他 URL 将获得 100%

使用的包：

• http: ^0.12.2
• 音频：^3.0.10
• path_provider：^1.6.24

Google 云端硬盘网址 = 'https://drive.google.com/file/d/1xnhT8mzMeU-wRemt1sNFR0DJt2MNmSC8/view?usp=sharing'; 古腾堡小说 URL = 'https://www.gutenberg.org/files/1342/1342-h.zip';

示例代码同时显示链接和结果。

输出：

• 预期大小：myColorsDIO.zip: 594,545, myColorsHTTP.zip: 594,545, 1342DIO.zip: 778512, 1342HTTP.zip: 778512
• 获得的尺寸： myColorsDIO.zip: 63411, myColorsHTTP.zip: 70677, 1342DIO.zip: 778512, 1342HTTP.zip：778512

请帮忙。

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(title: 'Flutter Demo', theme: ThemeData(primarySwatch: Colors.blue,visualDensity: VisualDensity.adaptivePlatformDensity,), home: MyHomePage(),);
  }
}

class MyHomePage extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Downloading Files'),),
      body: Center(child: Text('Press the floating button to download files',),),
      floatingActionButton: FloatingActionButton(
        onPressed: () { _downloadFile();},
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }

  Future<File> _downloadFile() async {

    String myUrl = 'https://drive.google.com/file/d/1xnhT8mzMeU-wRemt1sNFR0DJt2MNmSC8/view?usp=sharing';
    String my7ZIPUrl = 'https://www.gutenberg.org/files/1342/1342-h.zip';
    String myDownloadDirectory = ((await getApplicationDocumentsDirectory()).path);
    String myDownloadedGoogleFile1 = 'myColorsDIO.zip';
    String myDownloadedGoogleFile2 = 'myColorsHTTP.zip';
    String myDownloadedfromgutenberg1 = '1342DIO.zip';
    String myDownloadedfromgutenberg2 = '1342HTTP.zip';

    print('Download Directory: $myDownloadDirectory');
    //Downloading Google Drive zip file via DIO
    Dio dio = Dio();
    await dio.download(
        myUrl,
        '$myDownloadDirectory/$myDownloadedGoogleFile1',
        onReceiveProgress: (rcv, total) {print('received: ${rcv.toStringAsFixed(0)} out of total: ${total.toStringAsFixed(0)}');}
    );

    await dio.download(
        my7ZIPUrl,
        '$myDownloadDirectory/$myDownloadedfromgutenberg1',
        onReceiveProgress: (rcv, total) {print('received: ${rcv.toStringAsFixed(0)} out of total: ${total.toStringAsFixed(0)}');}
    );

    //Downloading Google Drive zip file via HTTP
    var req = await http.Client().get(Uri.parse(myUrl));
    var file = File('$myDownloadDirectory/$myDownloadedGoogleFile2',);
    file.writeAsBytes(req.bodyBytes);

    //Downloading Google Drive zip file via HTTP
    var req1 = await http.Client().get(Uri.parse(my7ZIPUrl));
    var file1 = File('$myDownloadDirectory/$myDownloadedfromgutenberg2',);
    file1.writeAsBytes(req1.bodyBytes);

    print('Expected size: myColorsDIO.zip: 594,545 , myColorsHTTP.zip: 594,545 , 1342DIO.zip: 778512,  1342HTTP.zip: 778512');
    print('myColorsDIO.zip: ${await File('$myDownloadDirectory/$myDownloadedGoogleFile1',).length()}, myColorsHTTP.zip: ${await File('$myDownloadDirectory/$myDownloadedGoogleFile2',).length()}, 1342DIO.zip: ${await File('$myDownloadDirectory/$myDownloadedfromgutenberg1',).length()},  1342HTTP.zip: ${await File('$myDownloadDirectory/$myDownloadedfromgutenberg2',).length()}');
    return null;
  }

}

Answer 1

分享链接不能直接用，把它放到浏览器里，当提示你下载时，就是那个有效的URL。