push_message_notification_messaging_style.kt

import android.graphics.Color
import androidx.core.app.NotificationCompat
import androidx.core.app.NotificationManagerCompat
import com.sample_app.R

private const val MESSAGES_CHANNEL_ID = "notification_channel_id"
private const val NOTIFICATION_ID = 123456

fun pushMessageNotification() {
    ...
    
    val chatMessageStyle = createMessageNotificationStyle(
        userName = "Olivia",
        userProfileBitmap = notificationIcon,
        text = "Hello! How are you?",
    )

    val notification = NotificationCompat.Builder(
        context,
        MESSAGES_CHANNEL_ID,
    )
        // no "setContentTitle" nor "setContentText" because
        // information is contained in "chatMessageStyle" that
        // we apply by calling "setStyle"
        .setStyle(chatMessageStyle)
        .setContentIntent(pendingIntent)
        .setSmallIcon(R.drawable.ic_android_black_24dp)
        .setAutoCancel(true)
        .setCategory(NotificationCompat.CATEGORY_MESSAGE)
        .build()

    NotificationManagerCompat.from(context).notify(NOTIFICATION_ID, notification)
}