Categorize messages by custom type

When sending a message, you can specify a custom message type to subclassify messages. This custom type takes on the form of String and can be useful in searching or filtering messages.

The data and customType properties of a message object allow you to append information to your messages. While both properties can be used flexibly, common examples for customType include grouping messages into categories such as Notes or Contacts.

To embed a custom type into your message, assign a value to customType under the UserMessageCreateParams or FileMessageCreateParams object. Then, pass the specified object as an argument to the parameter in the sendUserMessage() or sendFileMessage() method.

To get a message's custom type, read message.customType.

final params = UserMessageCreateParams(message: 'MESSAGE')
  ..customType = 'CUSTOM_TYPE';

try {
  final preMessage = channel.sendUserMessage(params, handler: (message, e) {
    if (e != null) {
      // Handle error.
    } else {
      // The message has been sent successfully.
    }    
  });
} catch (e) {
  // Handle error.
}

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