Android Question Help FireBase get users and send messages

hibrid0 said:

Now I want to know the ID of users, select one and send messages to any user for separare

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For this you need a server with a database. Each device calls a webservice (php or similar) and stores it's FCM token. Then you need a readable id like mail address, phone number, name (like in WhatsApp). Some registration is needed, to (like all the other chat-like apps).

You can also use B4X Push Server: https://www.b4x.com/android/forum/threads/48560/#content