从一个类输入，在另一个类输出？

I am developing an android application. I want it so that when a user creates an account, the application takes the user input from the New member class, and creates output in another class. For example, The user puts in their Name. And on the application home screen which is a whole different class, they are able to see, "Hello %name%! what would you like to do today?"Here I have my new user class. I am developing an android application. I want