无法下载通过我的谷歌驱动器应用程序创建的文件，但可以得到文件的元数据

问题描述

我跟所有的谷歌驱动器SDK中提到的步骤。我建立了我的设备上的示例应用程序（机器人，运行果冻豆）和我能够上传到驱动文件。当试图下载同一个文件，我能够得到这样FILEID，fileTitle，fileDownloadURL等元数据，但无法下载的内容。我收到401未授权错误。

I followed all the steps mentioned in google drive sdk. I created a sample application on my device(android, running jelly bean) and am able to upload a file on to drive. When trying to download the same file, I am able to get the meta data like fileID, fileTitle, fileDownloadURL etc but not able to download the content. I get 401 Unauthorized error.

我的应用程序AUTH SCOPE是AUTH_TOKEN_TYPE =oauth2： https://www.googleapis.com/认证/ drive.file ;

My app AUTH SCOPE is AUTH_TOKEN_TYPE = "oauth2:https://www.googleapis.com/auth/drive.file";

我做下面让OAuth的令牌：

I am doing the following to get the OAUTH Token:

AccountManager am = AccountManager.get(this);
        Bundle options = new Bundle();
        am.getAuthToken(
                mAccount,
                AUTH_TOKEN_TYPE,
                options,
                this,
                new OnTokenAcquired(),
                new Handler(){
                    @Override
                    public void handleMessage(Message msg) {
                        invadiateToken();
                        super.handleMessage(msg);
                    }
                });

基于令牌这是我建立Drive对象

Based on the token this is how I build the Drive object

Drive buildService(final String AuthToken) {
    HttpTransport httpTransport = new NetHttpTransport();
    JacksonFactory jsonFactory = new JacksonFactory();

    Drive.Builder b = new Drive.Builder(httpTransport, jsonFactory, null);
    b.setJsonHttpRequestInitializer(new JsonHttpRequestInitializer() {

        @Override
        public void initialize(JsonHttpRequest request) throws IOException {
            DriveRequest driveRequest = (DriveRequest) request;
            driveRequest.setPrettyPrint(true);
            driveRequest.setKey(API_KEY);
            driveRequest.setOauthToken(AuthToken);
        }
    });

    return b.build();
}

我可以用下面的code上传的文件：

I am able to upload the file using the following code:

private void uploadLocalFileToDrive(Drive service) throws IOException{

        // File's metadata.
        String mimeType = "text/plain";
        File body = new File();
        body.setTitle("myText.txt");
        body.setDescription("sample app by varun");
        body.setMimeType("text/plain");

        // File's content.
        java.io.File fileContent = new java.io.File(mInternalFilePath);
        FileContent mediaContent = new FileContent(mimeType, fileContent);

        service.files().insert(body, mediaContent).execute();

    }

在试图下载该应用程序上传同一文件，我得到一个401未经授权错误在这行的Htt presponse RESP = service.getRequestFactory（）。buildGetRequest（URL）.execute（ ）从以下code段

private void downloadFileFromDrive(Drive service) throws IOException {
        Files.List request;
            request = service.files().list();
            do {
                FileList files = request.execute();
                for(File file:files.getItems()){
                    String fieldId = file.getId();
                    String title = file.getTitle();
                    Log.e("MS", "MSV::  Title-->"+title+"  FieldID-->"+fieldId+" DownloadURL-->"+file.getDownloadUrl());
                    if (file.getDownloadUrl() != null && file.getDownloadUrl().length() > 0 ) {
                        GenericUrl url = new GenericUrl(file.getDownloadUrl());
                        HttpResponse resp = service.getRequestFactory().buildGetRequest(url).execute();
                        InputStream isd = resp.getContent();
                        Log.e("MS", "MSV:: FileOutPutStream--->"+getFilesDir().getAbsolutePath()+"/downloaded.txt");

                    } else {
                        Log.e("MS", "MSV:: downloadURL for this file is null");
                    }
                }
                request.setPageToken(files.getNextPageToken());
            } while (request.getPageToken()!=null && request.getPageToken().length()>0);
    }

任何人都可以帮助我，让我知道我在做什么错???

Can anyone help me out and let me know what I am doing wrong???

推荐答案

这是一个已知的问题，将与的的API。

This is a known issue that will be resolved with the release of the Google Play Services APIs.

由于您的应用程序被授权为 https://www.googleapis.com/auth/drive.file 的范围，并下载终端不支持？关键= 查询参数，也没有办法为我们的服务器知道哪些项目发出请求（以确保应用程序有权限读取这个文件的内容）。

Since your application is authorized for the https://www.googleapis.com/auth/drive.file scope, and the download endpoint doesn't support the ?key= query parameter, there is no way for our server to know which project is issuing the request (to make sure the app has authorization to read this file's content).

在此期间，唯一的解决方法，我可以推荐使用范围广泛： https://www.googleapis.com/auth/drive 。请仅使用在开发应用程序，并等待谷歌播放服务发布。

In the meantime, the only workaround I can recommend is using the broad scope: https://www.googleapis.com/auth/drive. Please use only that while developing your application and waiting for the Google Play Services to be released.

要了解更多关于如何将能够使用Android的新授权的API，你可能有兴趣在这些2谷歌I / O会谈：的和编写高效的驱动器应用程序为Android

To learn more about how you will be able to use the new authorization APIs in Android, you might be interested in those 2 Google I/O talks: Building Android Applications that Use Web APIs andWriting Efficient Drive Apps for Android

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