Firebase Push Messaging support

[dotbugfix]

New features

• Registering app with Firebase
• Getting a unique instance ID
• Subscribing to a topic and receiving messages sent to it

Log messages from testing

Get Instance ID

2019-03-24 19:17:46.296 6434-6434/com.saraswitty.wittyapp I/c*.s*.w*.MainActivity: [Firebase] Instance ID token: f_wvn6infE0:APA91bHsYjCBx27WnU4fUnRkGomfkdSWameo0NTEadmKyx5APbEXcEEY8ZHUuAkLo6wGxAI_5Cl7IsSiOvn7hlMpJORaMNftWHmqVRAP8owufPHC82AXHUg7-09Xcb6YFWASwlzNMOXI

Receive direct message from Firebase Console

2019-03-24 19:18:04.410 6434-7184/com.saraswitty.wittyapp I/*rebaseMessagingService: [Firebase] Message From: 998868710353
2019-03-24 19:18:04.411 6434-7184/com.saraswitty.wittyapp I/*rebaseMessagingService: [Firebase] Message data payload: {}
2019-03-24 19:18:04.413 6434-7184/com.saraswitty.wittyapp I/*rebaseMessagingService: [Firebase] Message Notification Body: Just saying hi!

Receive message on subscribed topic

019-03-24 19:23:29.245 6434-8257/com.saraswitty.wittyapp I/*rebaseMessagingService: [Firebase] Message From: /topics/weather
2019-03-24 19:23:29.245 6434-8257/com.saraswitty.wittyapp I/*rebaseMessagingService: [Firebase] Message data payload: {customKey=customValue}
2019-03-24 19:23:29.248 6434-8257/com.saraswitty.wittyapp I/*rebaseMessagingService: [Firebase] Message Notification Body: Just saying hi!

Screenshots

[ajaynair]

Are notifications queued? What happens if the app is not immediately available for the notification from firebase?

[ajaynair]

Are there any constraints on firebase usage (No.of. notifications we can send, No.of. notifications we can send at a time etc.)?

[ajaynair]

What are the steps required to test your changes on my phone?

1. Pull your code
2. ?

[ajaynair]

val token = task.result?.token

i.e. token can be null
Check if token is null here.

[dotbugfix]

Ah, ok will do.

[ajaynair]

Do you think we should use toast only for failure cases?

[dotbugfix]

Yes. This was only for quick debugging.

[dotbugfix]

Are notifications queued? What happens if the app is not immediately available for the notification from firebase?

Yes, see Lifetime of a message:

If the device is not connected to FCM, the message is stored until a connection is established (again respecting the collapse key rules). When a connection is established, FCM delivers all pending messages to the device. If the device never gets connected again (for instance, if it was factory reset), the message eventually times out and is discarded from FCM storage. The default timeout is four weeks, unless the time_to_live flag is set.

[dotbugfix]

Are there any constraints on firebase usage (No.of. notifications we can send, No.of. notifications we can send at a time etc.)?

Stackoverflow says its unlimited.

[dotbugfix]

What are the steps required to test your changes on my phone?

1. Pull your code

2. ?

On your laptop, open the Firebase Console and login as 'dotbugfix' (not your Google account). I've registered WittyApp as a project there. You can then follow the screenshots above to send a new notification and it should show up on your phone after the app is opened at least once (to subscribe to the topic).

Logcat on Android will print the unique instance ID for your phone - you can use that to send a 'test message' from Firebase. This is not required as we can send a message on the 'weather' topic instead of a particular device.