Google APIs Client Library for Java

Overview
Setup Instructions
Component Modules
Android
Google App Engine
Batching
Media Download
Media Upload
OAuth 2.0
Timeouts and Errors
Support

Running on Android (@Beta)

If you are developing for Android and the Google API you want to use is included in the Google Play Services library, use that library for the best performance and experience.

To access other Google APIs, use the Google Client Library for Java’s Android-specific helper classes, which are well-integrated with Android AccountManager.

For example:

@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  // Google Accounts
  credential =
      GoogleAccountCredential.usingOAuth2(this, Collections.singleton(TasksScopes.TASKS));
  SharedPreferences settings = getPreferences(Context.MODE_PRIVATE);
  credential.setSelectedAccountName(settings.getString(PREF_ACCOUNT_NAME, null));
  // Tasks client
  service =
      new com.google.api.services.tasks.Tasks.Builder(httpTransport, jsonFactory, credential)
          .setApplicationName("Google-TasksAndroidSample/1.0").build();
}

Getting started

Begin by reading the Android development instructions for the Google HTTP Client Library for Java.

Authentication

As described in the Android development instructions, the best practice on Android is to use the AccountManager class (@Beta) for centralized identity management and credential token storage.

For information about the OAuth 2.0 flow, see the OAuth 2.0 instructions for Android.

Partial response and update

Google APIs support a partial-response protocol that allows you to specify which fields are returned to you in the HTTP response. This can significantly reduce the size of the response, thereby reducing network usage, parsing response time, and memory usage. It works with both JSON and XML.

The following snippet of code drawn from the Google+ Sample demonstrates how to use the partial-response protocol:

Plus.Activities.List listActivities = plus.activities().list("me", "public");
listActivities.setMaxResults(5L);
// Pro tip: Use partial responses to improve response time considerably
listActivities.setFields("nextPageToken,items(id,URL,object/content)");
ActivityFeed feed = listActivities.execute();