Google Drive 实施到 Android 应用程序并从 Google Drive 下载文件 [英] Google Drive Implementation to Android app and Downloading the file from Google drive

问题描述

Drive 快速启动应用示例仅适用于将文件从 Android 设备上传到用户帐户.我想将文件从 Gdrive 下载到 Android 应用程序.任何帮助将不胜感激.

Drive Quick-start App example works for only uploading files from Android Device to user account. I want to download the files from Gdrive to android app. any help will be appreciated.

我想要这个演示示例的完全相反的过程 https://developers.google.com/drive/quickstart-android(从 Gdrive 下载)

I want exact reverse process of this Demo example https://developers.google.com/drive/quickstart-android (download it from Gdrive)

推荐答案

从云端硬盘下载文件内容有两个步骤.首先，检索文件的元数据和文件的 downloadUrl:

There are two steps to download file contents from Drive. First, retrieve the file's metadata and a downloadUrl for the file:

// retrieve metadata
File file = drive.files().get(fileId).execute();

然后，向 downloadUrl 发出经过身份验证的请求:

And, make an authenticated request to the downloadUrl:

// download contents a
GenericUrl url = new GenericUrl(file.getDownloadUrl());
HttpResponse response = drive.getRequestFactory().buildGetRequest(url).execute();
String contents = new Scanner(response.getContent()).useDelimiter("\A").next();

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