Flutter会从Google云端硬盘和一个硬盘中下载部分文件

问题描述

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

}

解决方法

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。