Firebase is overall pretty bad at delivering messages in time, but on Android, most apps are stuck with it. FCM is the only Google approved way to send push messages to Android devices, and it's what pretty much all apps use to deliver push notifications. The reason for this is Firebase Cloud Messaging (FCM). If you've ever picked up your phone and suddenly had 10 messages that were sent long before you know what I'm talking about. Limitations without instant delivery: Without instant delivery, messages may arrive with a significant delay (sometimes many minutes, or even hours later). Turning off the persistent instant delivery notification Then toggle the "Subscription Service" off: To do so, long-press on the foreground notification (screenshot above) and navigate to the settings. This is achieved with a foreground service, which you'll see as a permanent notification that looks like this:Īndroid does not allow you to dismiss this notification, unless you turn off the notification channel in the settings. when the screen turns off, and you leave it on the desk for a while. Instant delivery allows you to receive messages on your phone instantly, even when your phone is in doze mode, i.e. Per-priority sound/vibration settings Instant delivery ¶ Per notification channel, you can configure a channel-specific sound, whether to override the Do Not Disturb (DND) setting, and other settings such as popover or notification dot: There is one notification channel for each priority: You can change these settings in Android by long-pressing on the app, and tapping "Notifications", or from the "Settings" menu under "Channel settings". High and urgent notifications show as pop-over ![]() Messages with high or urgent priority (>= 4) will also show as pop-over, like so: This priority defines how urgently Android will notify you about the notification, and whether they make a sound and/or vibrate.īy default, messages with default priority or higher (>= 3) will vibrate and make a sound. ![]() When you publish messages to a topic, you can define a priority. ![]() If those screenshots are still not enough, here's a video: Sending push notifications to your Android phone Message priority ¶
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