问题
Can one use a 3rd party service to send Push Notifications without relying on Google's Firebase Cloud Messaging (FCM)?
If the Firebase package is not included with the app by default, could creating / using a custom framework have a similar feature set as Firebase? Or is Firebase integrated within the Android Operating System in some way that is external from an app?
回答1:
So it depends on your requirements. So if you want to just send normal notifications, then I can really recommend the PushBots.
But if you want to create extra features like invisible data payload, you probaly have to use FCM.
回答2:
You can try out services like Baidu, a very well known messaging service in China.
来源：https://stackoverflow.com/questions/44570247/push-notifications-without-firebase-cloud-messaging