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Chat Android v4
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This is the new Docs for Chat SDK v4 for Android. To see the previous Docs, click here.

When a user is online, all data associated with the group channels they are a member of are automatically updated. However, when a user is disconnected from the Sendbird server and reconnects later, the refresh() method should be called to update the channels with the latest information.

groupChannel.refresh { e ->
    if (e != null) {
        // Handle error.
    }

    // ...
}

Note: If you want to provide the updated channels with the latest information when your user's app is in the foreground, call refresh() in the onReconnectSucceeded() method which receives a callback from the Sendbird server when successfully reconnected.