MainActivity.java:

public class MainActivity extends GooglePlayServiceActivity implements PushCallback, ConnectListener {
...
Singular.init(this, new SingularConfig("com2ususa_ef7d31a4", "0ad35eca4cda05edd901a1fb892f39b1"));
...
}

Singluar.java:

public static void init(Context context, String str, String str2) {
        init(context, new SingularConfig(str, str2));
}

public static boolean init(Context context, SingularConfig singularConfig) {
        try {
            singular = SingularInstance.getInstance(context, singularConfig);
            saved_application_context = context.getApplicationContext();
        } catch (IOException e) {
            logger.debug("Failed to init() Singular SDK");
            logger.error("init() IOException", e);
            singular = null;
        } catch (RuntimeException e2) {
            reportException(e2);
            logger.error("Exception", e2);
        }
        return isInitialized();
    }