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Before you begin

1. Register a QuickBlox account. This is a matter of a few minutes and you will be able to use this account to build your apps.
2. Configure QuickBlox SDK for your app. Check out Setup page for more details.
3. Create a user session to be able to use QuickBlox functionality. See Authentication page to learn how to do it.
4. Connect to the Chat server. See Connection page to learn how to do it.

Visit Key Concepts page to learn the most important QuickBlox concepts.

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Check if a user is online

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Ping user

QuickBlox SDK can send application-level pings to a user. As a result, you can check if the user is connected to the Chat server.

int userId = 89987878;

try {
  await QB.chat.pingUser(userId);
} on PlatformException catch (e) {
  // Some error occurred, look at the exception message for more details
}

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Ping server

QuickBlox SDK can send application-level pings to a server. As a result, you can check if there is a connection with the Chat server.

try {
  await QB.chat.pingServer();
} on PlatformException catch (e) {
  // Some error occurred, look at the exception message for more details
}