Here are the examples of the java api class com.google.android.gms.iid.InstanceID taken from open source projects.
1. PubSubService#getToken()
Project: easygoogle
File: PubSubService.java
File: PubSubService.java
private String getToken(String senderId) throws IOException { InstanceID instanceID = InstanceID.getInstance(this); return instanceID.getToken(senderId, GoogleCloudMessaging.INSTANCE_ID_SCOPE, null); }