How to display data which contains topics and sub topics like a book in an android app?

Hi I am building an android app which contains information regarding some 11 steps of a process. The 11 steps are displayed in a recyclerview in a activity. When you click on any topic its brief introducton appears in a separate activity. When you click on the details button one more activity appears with the full details regarding the step. Note the details contain Headings, sub headings, images and descriptions like in a book. I want to load the data dynamically in the same activity for every step instead of making 11 separate description activities. How do I acheive that.