移动开发问题
onTokenRefresh not getting called in signed APK, if previous version of app installed doesn#39;t have FCM implemented(onTokenRefresh 不会在签名的 APK 中被调用，如果之前安装的应用版本没有实现 FCM)
Keep data from the Firebase Realtime Database always in sync(始终保持 Firebase 实时数据库中的数据同步)
How to restore topic subscriptions after refreshed token?(刷新令牌后如何恢复主题订阅?)
Firebase Cloud Messaging - Are GCM canonical IDs still necessary?(Firebase 云消息传递 - GCM 规范 ID 是否仍然需要?)
Firebase API is not sending push notifications when using the API(使用 API 时 Firebase API 不发送推送通知)
Can#39;t send push notifications using the server API(无法使用服务器 API 发送推送通知)
Restricting GCM/FCM notifications through unregister(通过注销限制 GCM/FCM 通知)
Failed to resolve: play-services-tasks(无法解决:play-services-tasks)
How to handle FirebaseInstanceId.getInstance().getToken() = null(如何处理 FirebaseInstanceId.getInstance().getToken() = null)
FCM default icon uses invalid gradient(FCM 默认图标使用无效渐变)
Is GCM (now FCM) free for any limit?(GCM(现在的 FCM)是否有任何限制?)
Firebase Cloud Messaging - Check existing or available Topics(Firebase 云消息传递 - 检查现有或可用主题)
