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Firebase Cloud Messaging Device to Device

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Takuma Lee
Takuma Lee

This document summarizes how to use Firebase Cloud Messaging (FCM) to send messages between Android devices without an FCM connection server. It discusses obtaining an FCM instance ID token, using the Firebase database and RemoteConfig, including the server key and message format in FCM requests, and handling received messages with FirebaseMessagingService. The presenter provides code examples and demos how to extend this approach for applications like chat messaging.

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FCM Device to Device Takuma@Android Study Group
Takuma Lee@Android Study Group vmgsahm1@gmail.com Individual App Developer@MangaChat Today¡¯s source code https://github.com/TakumaMochizuki/FcmD2D Download APK: http://bit.ly/2d75nfx Licensed under the Charlie Tsai
Agenda ? FCM InstanceID token ? Firebase Database ? Firebase RemoteCon?g ? GCM Parameter ? Live Debugging & Demo
FCM InstanceID Token ? Access the device registration token ? On initial startup of your app, the FCM SDK generates a registration token for the client app instance. ? If you want to target single devices or create device groups, you'll need to access this token by extending FirebaseInstanceIdService.
FCM InstanceID Token ? The registration token may change when ? The app deletes Instance ID ? The app is restored on a new device ? The user uninstalls/reinstall the app ? The user clears app data.
FCM InstanceID Token
Firebase Database ? Rule ? No setting, database will return ¡°Permission denied.¡± ? Code in FirebaseManager.java
Firebase Database
Firebase RemoteCon?g
GCM Parameter A message request is made of 2 parts: HTTP header and HTTP body. The HTTP header must contain the following headers: ? Server Key ? Header -> Authorization: key=YOUR_SERVER_KEY (Authorization, key=Azlxxxxxx¡­ic) ? Header -> Content-Type: application/json (for JSON) ? Header -> application/x-www-form-urlencoded;charset=UTF-8 (for plain text.) ? Request Url ? https://fcm.googleapis.com/fcm/send https://developers.google.com/cloud-messaging/http
Server Key Step #1: Log into https://cloud.google.com/console with your Google account Step #2: In the navigation on the left, go into "APIs & auth > APIs" Step #3: Find "Google Cloud Messaging for Android" and open this service. Step #4: In the navigation on the left, go into "APIs & auth > Credentials Step #5: You can see the Server key (auto created by google service) Step #6: Copy your key
Post Format https://?rebase.google.com/docs/cloud-messaging/send-message
Receive Messages ? FirebaseMessagingService:onMessageReceived
Question?
Live Debugging & Demo
Extending ? Awesome Chat (https://github.com/TADSG/my-awesome-chat) ? Gitbook (https://www.gitbook.com/book/cateyeslin/ myawesomechat/details)
Thanks

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Firebase Cloud Messaging Device to Device

  • 2. Takuma Lee@Android Study Group vmgsahm1@gmail.com Individual App Developer@MangaChat Today¡¯s source code https://github.com/TakumaMochizuki/FcmD2D Download APK: http://bit.ly/2d75nfx Licensed under the Charlie Tsai
  • 3. Agenda ? FCM InstanceID token ? Firebase Database ? Firebase RemoteCon?g ? GCM Parameter ? Live Debugging & Demo
  • 4. FCM InstanceID Token ? Access the device registration token ? On initial startup of your app, the FCM SDK generates a registration token for the client app instance. ? If you want to target single devices or create device groups, you'll need to access this token by extending FirebaseInstanceIdService.
  • 5. FCM InstanceID Token ? The registration token may change when ? The app deletes Instance ID ? The app is restored on a new device ? The user uninstalls/reinstall the app ? The user clears app data.
  • 7. Firebase Database ? Rule ? No setting, database will return ¡°Permission denied.¡± ? Code in FirebaseManager.java
  • 10. GCM Parameter A message request is made of 2 parts: HTTP header and HTTP body. The HTTP header must contain the following headers: ? Server Key ? Header -> Authorization: key=YOUR_SERVER_KEY (Authorization, key=Azlxxxxxx¡­ic) ? Header -> Content-Type: application/json (for JSON) ? Header -> application/x-www-form-urlencoded;charset=UTF-8 (for plain text.) ? Request Url ? https://fcm.googleapis.com/fcm/send https://developers.google.com/cloud-messaging/http
  • 11. Server Key Step #1: Log into https://cloud.google.com/console with your Google account Step #2: In the navigation on the left, go into "APIs & auth > APIs" Step #3: Find "Google Cloud Messaging for Android" and open this service. Step #4: In the navigation on the left, go into "APIs & auth > Credentials Step #5: You can see the Server key (auto created by google service) Step #6: Copy your key
  • 16. Extending ? Awesome Chat (https://github.com/TADSG/my-awesome-chat) ? Gitbook (https://www.gitbook.com/book/cateyeslin/ myawesomechat/details)