9.13. Multiple Choice Quiz App: List of Lists (Optional)¶
Time Estimate: 45 minutes
This version of the Presidents Quiz app introduces a couple of new features. One is the
List Picker component, which you can see at work in the preview video. It
provides the user with a list of options, letting us create multiple-choice quizzes,
rather than just short-answer quizzes as in the previous version of the app.
The other feature is a complex programming construct known as a
list of lists -- i.e., a list that contain sublists as its elements.
The list of lists abstraction is a data structure that you will
find useful not only in this app but it lots of upcoming apps.
Objectives: In this lesson you will learn to :
To get started, open
App Inventor with the List of Lists template in a separate tab and follow along with the following tutorial.
|1 Use a ListPicker||2 Define a list of lists for answer choices|
9.13.4. Reflection: For Your Portfolio¶
Create a page named List of Lists under the Reflections category of your portfolio and answer the following questions.
- Describe how using a list of lists allowed the Presidents Quiz app to have more variety.