Write an Android application

I need someone to answer a few questions i have. I will be having an app made for me like the choices app. My first question is what counts as a new page within an app? My app with have character pictures whos dialogue will be deplayed in text boxes underneath will i have to have a separate picture for each dialogue that chages with a tap and when the dialogue changes with a tap even if nothing else chages but the words is that a new page. For graphics do i need to have someone draw buttens for my app.