You can ensure all requests have these query parameters by adding a custom RequestInterceptor to your RestAdapter
RequestInterceptor requestInterceptor = new RequestInterceptor()
{
@Override
public void intercept(RequestFacade request) {
request.addQueryParam("app_version", "Version 1.x");
request.addQueryParam("device_type", "Samsung S4");
}
};
restAdapter.setRequestInterceptor(requestInterceptor)