是否可以在带有可扩展选项的推送通知中发送 Firebase(FCM) 通知消息（多行消息）； 使用 Python？

Question

I searched for the solution but could not find any relevant results.

This is what i am trying but didn't get desired output -

message = messaging.MulticastMessage(
notification=messaging.Notification(
title="Title",
body="body line1\nbody line2\nbody line3\nbody line4\nbody line5\nbody line6"),
tokens=['eg-token1','eg-token2','eg-token3',...,'eg-tokenN']
 )
messaging.send_multicast(message)

Ok, Straight forward, In below attached image you can see green squared expand option for WhatsApp and Gmail chat notification. I want the same for my red squared notification that i sent using firebase FCM.

If it's not possible using FCM then how we can achieve this??

Thank you!

Answer 1

This will depend on how the notification is being handled in the client. For example, look into the sendNotification method from the Firebase Messaging sample :

        val notificationBuilder = NotificationCompat.Builder(this, channelId)
                .setSmallIcon(R.drawable.ic_stat_ic_notification)
                .setContentTitle(getString(R.string.fcm_message))
                .setContentText(messageBody)
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent)

Here the notification is being generated, and as suggested in this answer , setting the style in the notification with setStyle will result in the behavior your are expecting:

val notificationBuilder = NotificationCompat.Builder(this, channelId)
                .setSmallIcon(R.drawable.ic_stat_ic_notification)
                .setContentTitle(getString(R.string.fcm_message))
                .setContentText(messageBody)
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent)
                .setStyle(NotificationCompat.BigTextStyle().bigText(messageBody))

This is the result I got: