通过Java访问google photos API

Question

我对谷歌应用编程接口非常陌生，我有麻烦了。我留档谷歌照片APIJava，然后我在谷歌API控制台创建OAuth凭据并下载它（credentials.json文件）。之后，我试图访问谷歌照片。这里是代码从留档：

// Set up the Photos Library Client that interacts with the API
PhotosLibrarySettings settings =
   PhotosLibrarySettings.newBuilder()
  .setCredentialsProvider(
      FixedCredentialsProvider.create(/* Add credentials here. */)) 
  .build();

try (PhotosLibraryClient photosLibraryClient =
    PhotosLibraryClient.initialize(settings)) {

  // Create a new Album  with at title
  Album createdAlbum = photosLibraryClient.createAlbum("My Album");

  // Get some properties from the album, such as its ID and product URL
  String id = album.getId();
  String url = album.getProductUrl();

 } catch (ApiException e) {
    // Error during album creation
 }

但是我不明白如何创建凭据对象，将其传递给FixedCreentialsProvider.create（）方法

你能给我一些解释/链接吗？

Answer 1

您首先需要了解OAuth 2：https://www.digitalocean.com/community/tutorials/an-introduction-to-oauth-2

然后你可以看看这个答案https://stackoverflow.com/a/54533855/6153171

附言：1。授权类型：授权代码谷歌开发者控制台：凭证为web客户端。

googleApiClient-

googleApiClient-

Answer 2

调用接受一个com.google.auth.凭据对象。对于谷歌照片库应用编程接口，这应该是一个用户凭据对象，您可以创建用户凭据。Builder是Google OAuth库的一部分。在那里，您设置了刷新令牌、客户端ID、客户端机密等来初始化凭据。获取刷新令牌需要您的应用程序完成提示用户进行授权和批准的GoogleAuthorizationCodeFlow。

您可以在GitHub上查看示例实现，但以下是相关代码：

  GoogleAuthorizationCodeFlow flow =
        new GoogleAuthorizationCodeFlow.Builder(
                GoogleNetHttpTransport.newTrustedTransport(),
                JSON_FACTORY,
                clientSecrets,
                selectedScopes)
            .setDataStoreFactory(new FileDataStoreFactory(DATA_STORE_DIR))
            .setAccessType("offline")
            .build();
    LocalServerReceiver receiver =
        new LocalServerReceiver.Builder().setPort(LOCAL_RECEIVER_PORT).build();
    Credential credential = new AuthorizationCodeInstalledApp(flow, receiver).authorize("user");
    return UserCredentials.newBuilder()
        .setClientId(clientId)
        .setClientSecret(clientSecret)
        .setRefreshToken(credential.getRefreshToken())
        .build();

涉及到一些活动部分，但是Google Photos库API客户端库与Google身份验证库一起处理OAuth身份验证。

Answer 3

您可以创建一个UserCredentials对象并传递它

UserCredentials.newBuilder()
        .setClientId("your client id")
        .setClientSecret("your client secret")
        .setAccessToken("Access Token")
        .build()

仔细检查这个答案https://stackoverflow.com/a/54533855/6153171

或者在github上查看这个完整的项目https://github.com/erickogi/AndroidGooglePhotosApi