update
public abstract void updateMessageExpansion(Map<String, String> expansion, String messageUId, RongIMClient.OperationCallback callback)
Update message extension information
Each message can carry a maximum of 300 key-value pairs of extension information. A single update can set a maximum of 20 key-value pairs.
Parameters
expansion
The key-value pairs of message extension information to be updated, of type HashMap. Key supports combinations of uppercase and lowercase letters, numbers, and special symbols + = - _. Chinese characters are not supported. Value can include spaces.
message
The message messageUId
callback
Callback for updating extension information