FCMSend.java

private static final String ANDROID_NEWS_ICON_RESOURCE = "news_alert_icon";
private static final int APNS_NEWS_BADGE_RESOURCE = 42;
private static final String WEBPUSH_NEWS_ICON_URL = "https://auto.news.url/alert.png";

public String sendAutoNewsAlert(String title, String body) throws Exception {
  Message message = Message.builder()
      .setNotification(new Notification(title, body))
      .setAndroidConfig(AndroidConfig.builder()
          .setNotification(AndroidNotification.builder()
              .setIcon(ANDROID_NEWS_ICON_RESOURCE)
              .build())
          .build())
      .setApnsConfig(ApnsConfig.builder()
          .setAps(Aps.builder()
              .setBadge(APNS_NEWS_BADGE_RESOURCE)
              .build())
          .build())
      .setWebpushConfig(WebpushConfig.builder()
          .setNotification(new WebpushNotification(null, null, WEBPUSH_NEWS_ICON_URL))
          .build())
      .setTopic("auto-news")
      .build();
  return FirebaseMessaging.getInstance().sendAsync(message).get();
}