FirebaseInstanceIdService getToken returning null(FirebaseInstanceIdService getToken 返回 null)

Firebase Cloud Messaging different keys(Firebase 云消息传递不同的密钥)

Do I need to migrate GCM to FCM on client side?(我需要在客户端将 GCM 迁移到 FCM 吗?)

Google FCM getIntent not returning expected data when app is in background state(当应用程序处于后台状态时，Google FCM getIntent 未返回预期数据)

FCM Notification Delivery Report(FCM 通知发送报告)

Android FCM not receiving notifications when app is removed from background(从后台删除应用程序时，Android FCM 未收到通知)

When to register an FCM token for a user(何时为用户注册 FCM 令牌)

Firebase listener when app is in the background(应用程序在后台时的 Firebase 侦听器)

How to delete a topic from Firebase Console? (FCM)(如何从 Firebase 控制台中删除主题?(FCM))

FCM Push notifications do not work on iOS 11(FCM 推送通知在 iOS 11 上不起作用)

Android FCM notification grouping(Android FCM 通知分组)

Handling refresh tokens for FCM device groups(处理 FCM 设备组的刷新令牌)

Firebase Cloud Messaging - Check existing or available Topics(Firebase 云消息传递 - 检查现有或可用主题)

Firebase (FCM): open activity and pass data on notification click. android(Firebase (FCM):打开活动并在通知点击时传递数据.安卓)

Receive GCM notification even when the app is closed (slide/swiped away)(即使应用程序关闭(滑动/滑动)也能接收 GCM 通知)

Firebase onTokenRefresh() is not called(Firebase onTokenRefresh() 未被调用)

Firebase Cloud Messaging send click_action(Firebase 云消息发送 click_action)

How to handle the Firebase notification when app is in foreground(当应用程序处于前台时如何处理 Firebase 通知)

Topics on Firebase Cloud Messaging?(Firebase 云消息传递的主题?)

What method should I use now since FirebaseInstanceId.getInstance().getToken() is deprecated(我现在应该使用什么方法，因为 FirebaseInstanceId.getInstance().getToken() 已被弃用)