Change constants defined in interface-Collection of common programming errors

I have interface which hosts constants needed by my application. I would like to be able to change then during runtime, becuase they depends on various conditions. I have created small class, which will have method for handling constant. In this class I have implemented interface with constant, I have access to them but I cannot change their content. I know constants are supposed to be stable without changing, but still, is there any way how to change them?

Thx

Edit:

Of course this is not from my head, I need to change ready made library, which should depend on Android manufacturer. And I am asking if there is some other way then reimplementing it.