Question

Flutter无法从Google Drive或OneDrive，zip或其他方式下载文件。这些文件只是部分下载，而来自网站等大多数其他链接的文件则完全下载。

例如，此Google云端硬盘链接将仅获得10％的文件下载，而小说的其他URL将获得100％

使用的包裹：

http：^ 0.12.2
dio：^ 3.0.10
path_provider：^ 1.6.24

Google云端硬盘URL ='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';

示例代码同时显示了链接和结果。

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

请帮助。

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

共享链接无法直接使用，将其放在浏览器中，当系统提示您进行下载时，即有效的URL。

Flutter会从Google云端硬盘和一个硬盘中下载部分文件

1 个答案: