android quiz editor implementation

we are planning to build a quiz app for android. The idea is that the user can add quizzes, let us say he can add name, description, etc. in the quiz body the user can add text, images or code segments. So, the user has something like building blocks that he can add, rearrange and remove. Now the question is: what is the best way to implement this? What design pattern should we use? And what is the best strategy to represent these elements in android.