Android : how to create contents in an activity dynamically

I am developing an android application, in which user can take a test and get his score. So, I have created a database with 50 questions and I want to choose a question number randomly using Random class and retrieve that question from database and show it in an Activity. And by clicking "Next question" button in the activity, I want the same activity to be loaded with different question. How can I write the code for this?