MyFirebaseInstanceIDService.java

package sample.github.nisrulz.firebasecloudmessaging;

import android.util.Log;
import com.google.firebase.iid.FirebaseInstanceId;
import com.google.firebase.iid.FirebaseInstanceIdService;

public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {

  private static final String TAG = "MyFirebaseIIDService";

  @Override public void onTokenRefresh() {
    String refreshedToken = FirebaseInstanceId.getInstance().getToken();
    Log.d(TAG, "Refreshed token:" + refreshedToken);
    sendRegistrationToServer(refreshedToken);
  }

  private void sendRegistrationToServer(String token) {
    // save the token
  }
}