How to make a quick change of accounts in the VK SDK?

Question

Android

I am writing a client You need to do a quick account change. So far, this is how I do it: the required token is loaded from the database, and then the .save () method is applied to it.
However, with this approach, changes take effect only after the application is restarted. How to make sure that the account change occurs immediately?
PS Do not judge strictly, this is my first more or less serious project