They float on top of other app content and follow the user wherever they go. Bubbles can be expanded to reveal app functionality and information, and can be collapsed when not being used. When the device is locked or the always-on-display is active, bubbles appear just as a notification normally would.
Bubbles are an opt-out feature. When an app presents its first bubble, a permission dialog is shown that offers two choices:. Bubbles are created via the Notification API, so you send your notification as normal. If you want your notification to display as a bubble, you need to attach some extra data to it.
The expanded view of a bubble is created from an activity that you choose. The Activity needs to be configured to display properly as a bubble. The activity must be resizeable and embedded. If it lacks either of these requirements it displays as a notification instead. If your app shows multiple bubbles of the same type, like multiple chat conversations with different contacts, the activity must be able to launch multiple instances.
On devices running Android 10, notifications are not shown as bubbles unless you explicitly set documentLaunchMode to "always". Beginning with Android 11, you do not need to explicitly set this value, as the system automatically sets all conversations' documentLaunchMode to "always". If your app is in the foreground when a bubble is sent, importance is ignored and your bubble will always be shown unless the user has blocked bubbles or notifications from your app.
You can configure your bubble to present it in expanded state automatically. We recommend only using this functionality if the user performs an action that would result in a bubble, like tapping on a button to start a new chat.
In this case, it also makes sense to suppress the initial notification sent when a bubble is created. There are methods you can use to set flags that enable these behaviours: setAutoExpandBubble and setSuppressNotification. When a bubble is expanded, the content activity goes through the normal process lifecycle , resulting in the application becoming a foreground process if not already. When the bubble is collapsed or dismissed the activity will be destroyed.
This may result in the process being cached and later killed, depending on whether the app has any other foreground components running. To reduce the number of interruptions for the user, bubbles only appear under certain circumstances. If an app targets Android 11 or higher, a notification doesn't appear as a bubble unless it meets the conversation requirements.
If an app targets Android 10, the notification appears as a bubble only if one or more of these conditions are met:. The People sample app is a simple conversation app that uses bubbles. For demonstration purposes, this app uses chat bots. In real-world applications, bubbles should only be used for messages by humans, not by bots.
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