如何使用GoogleApiClient的教室服务

Question

示例代码https://developers.google.com/classroom/quickstart/android显示了在使用GoogleAcccountCredential类登录到Google时如何调用该服务。

mService = new com.google.api.services.classroom.Classroom.Builder(
      transport, jsonFactory, credential) 
      .setApplicationName("Kindergarten Math School") 
      .build(); 

但是，随着新版本我们现在使用play-services-auth，我们现在使用的是GoogleApiClient。我们如何使用它创建服务？

Answer 1

您的应用程序发送给Classroom API的每个请求都必须包含授权令牌。令牌还可以识别您的应用程序到Google。您可以使用Google Sign-in或OAuth 2.0

使用classroom.googleapis.com有不同的服务，如.courses。您可以使用该服务创建课程。

HTTP请求

POST https://classroom.googleapis.com/v1/courses 

{ 
"id": string, 
"name": string, 
"section": string, 
"descriptionHeading": string, 
"description": string, 
"room": string, 
"ownerId": string, 
"creationTime": string, 
"updateTime": string, 
"enrollmentCode": string, 
"courseState": enum(CourseState), 
"alternateLink": string, 
"teacherGroupEmail": string, 
"courseGroupEmail": string, 
"teacherFolder": { 
object(DriveFolder) 
}, 
"courseMaterialSets": [ 
{ 
object(CourseMaterialSet) 
} 
], 
} 

需要他下面的OAuth范围：

https://www.googleapis.com/auth/classroom.courses

详情regaridng课堂API，检查此链接：https://developers.google.com/classroom/reference/rest/

Answer 2

所以，我做了如下变化 -

新增的依赖回来的build.gradle -

schoolCompile('com.google.api-client:google-api-client-android:1.22.0') { 
    exclude group: 'org.apache.httpcomponents' 
} 

然后，创建凭证对象旁边的googleApiClient

GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN) 
     .requestIdToken(activity.getApplicationContext().getResources().getString(R.string.firebase_client_id)) 
     .requestEmail() 
     .requestProfile() 
     .requestScopes(new Scope(ClassroomScopes.CLASSROOM_COURSES_READONLY), new Scope(ClassroomScopes.CLASSROOM_ROSTERS_READONLY)) 
     .requestServerAuthCode(auth_client_id) 
     .build(); 


mGoogleApiClient = new GoogleApiClient.Builder(activity) 
    .enableAutoManage(activity /* FragmentActivity */, this /* OnConnectionFailedListener */) 
    .addConnectionCallbacks(this) 
    //.addOnConnectionFailedListener(this) 
    .addApi(Auth.GOOGLE_SIGN_IN_API, gso) 
    .build(); 

mCredential = GoogleAccountCredential.usingOAuth2( 
    activity.getApplicationContext(), Arrays.asList(SCOPES)) 
    .setBackOff(new ExponentialBackOff()); 

做了登录使用mGoogleApiClient -

Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient); 
activity.startActivityForResult(signInIntent, REQUEST_ACCOUNT_PICKER); 

当该完成（在onActivityResult中），设置凭证上的电子邮件 -

GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data); 
if (result.isSuccess()) { 
    // Signed in successfully, show authenticated UI. 
    GoogleSignInAccount acct = result.getSignInAccount(); 
    mCredential.setSelectedAccountName(acct.getEmail()); 
} else { 
    // Signed out, show unauthenticated UI. 
    Log.i("GoogleAuthHelper", "Log in failed:"+result.getStatus()); 
} 

连接到教室的时候创建服务作为之前使用的凭据 -

HttpTransport transport = AndroidHttp.newCompatibleTransport(); 
JsonFactory jsonFactory = JacksonFactory.getDefaultInstance(); 
mService = new com.google.api.services.classroom.Classroom.Builder( 
    transport, jsonFactory, credential) 
    .setApplicationName("Kindergarten Math School") 
    .build(); 

而且，这工作。在登录过程中，我被要求授权额外的课堂范围。课堂呼叫成功完成。仍然清理上面的代码，但是，它的工作原理！