应用程序默认凭据不可用。 如果在 Google Compute Engine 中运行，它们就可用。 否则 - java android

Question

我使用谷歌驱动器制作一个应用程序来将用户的文件存储到他们的谷歌驱动器我遵循谷歌开发者指南https://developers.google.com/drive/api/guides/about-sdk当我按下按钮上传我的文件我得到了标题错误这是

我的代码：

 try {
        // Load pre-authorized user credentials from the environment.
        GoogleCredentials credentials = GoogleCredentials.getApplicationDefault()
                .createScoped(Arrays.asList(DriveScopes.DRIVE_FILE));
        HttpRequestInitializer requestInitializer = new HttpCredentialsAdapter(
                credentials);

        Drive service = new com.google.api.services.drive.Drive.Builder(new NetHttpTransport(),
                GsonFactory.getDefaultInstance(),
                requestInitializer)
                .setApplicationName(getString(R.string.app_name))
                .build();

        File fileMetaDate = new File();
        fileMetaDate.setName(getString(R.string.db_name_lists));
        File file1 = service.files().create(fileMetaDate, fileContent)
                .setFields("id")
                .execute();
        Toast.makeText(this, file1.getId() + " has been created", Toast.LENGTH_SHORT).show();
    } catch (IOException e) {
        e.printStackTrace();
    }

错误

应用程序默认凭据不可用。 如果在 Google Compute Engine 中运行，它们就可用。 否则 - java android

Answer 1

使用

 GoogleCredentials credentials = GoogleCredentials.getApplicationDefault()

您必须定义环境变量GOOGLE_APPLICATION_CREDENTIALS指向定义凭据的文件。

否则，您可以按照Google 驱动器 java 快速入门中所示的方式进行操作

private static final String CREDENTIALS_FILE_PATH = "/credentials.json";

InputStream in = DriveQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
if (in == null) {
  throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
}
GoogleClientSecrets clientSecrets =
    GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));