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Chat SDKs Android v4
Chat SDKs Android
Chat SDKs
Version 4

Add or remove a user event handler

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To receive information about events related to users connected to the Sendbird server, add a user event handler with its unique user-defined ID by calling SendbirdChat.addUserEventHandler().

If you want to stay informed of changes related to users and notify users' client apps of these changes, define and register multiple user event handlers to each Activity instance.

User event types

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List of user events

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The onTotalUnreadMessageCountChanged() attribute is turned off by default. Contact us if you wish to use this feature.

MethodInvoked whenNotified devices


A user has read messages in the joined group channels and there is an update on the total number of the user's unread messages.

The user's devices running client apps. The devices are notified of the total number of unread messages along with a collection of the number of unread messages by custom channel type.

Add a user event handler

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The following code shows a full set of supported event callbacks with their parameters and how to add a user event handler to the unique SendbirdChat instance.

    object : UserEventHandler() {
        override fun onTotalUnreadMessageCountChanged(totalCount: Int, totalCountByCustomType: Map<String, Int>) {}

Remove a user event handler

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The following code shows how to remove the user event handler.