Proxy-GoogleAPIs

proxy-googleapis.java

com.google.api.client.googleapis.auth.oauth2.GoogleCredential credential = com.google.api.client.googleapis.auth.oauth2.GoogleCredential.getApplicationDefault(mHttpTransport,jsonFactory);
if (credential.createScopedRequired())
    credential = credential.createScoped(Arrays.asList(StorageScopes.DEVSTORAGE_READ_ONLY));

com.google.api.services.storage.Storage service = new com.google.api.services.storage.Storage.Builder(mHttpTransport, jsonFactory, credential)
                .setApplicationName("oauth client")   
                .build();