1. Plan for today Refactoring and Design Patterns
What is a Quiz
How do you create quiz, get quiz, use quiz
What is the model, what is the view
Android specific, OO Specific
Understanding vocabulary, getting projects done, working in pairs and/or groups
Compsci 290 compared to IRL

2. Java and Object-Oriented Concepts
What is a class? When to use inheritance?
Class encapsulates state and behavior
State is instance variables
Behavior is public/exported methods: API
Inheritance models "is-a"
Liskov Substitution Principle
Given pointer/reference to Foo, replace with any subtype/subclass and everything works (beware of Rectangle/Square)

3. Quiz Differences
What are the differences in 2 and 4 question quizzes from Model perspective
A quiz is not part of a view here, it's a model/part of a model
Is this state difference of a behavior difference?
How might you capture the differences?
Subclassing?
Changing public methods of Quiz/Question?

4. Conceptual and Practical Refactoring
Design and Implementation: iterative
Think first, code later?
Code first, think later?
Think, code, think, code, … repeat until done
What is a Quiz?
Think about this from both programmatic and non-programmatic views
Do programs model real-world expectations?

5. Refactoring Ideas Question class: state and behavior What is a Quiz?
What is a question?
Ideas for two/four answer question
Who (what) creates a Question?
What is a Quiz?
What was a QuizGenerator in original program, what are flaws with that design?
What might be source of quiz?
Should user have choice of quizzes? How?

6. Design Pattern
In software engineering, a software design pattern is a general reusable solution to a commonly occurring problem within a given context in software design. It is not a finished design that can be transformed directly into source or machine code. It is a description or template for how to solve a problem that can be used in many different situations. Design patterns are formalized best practices that the programmer can use to solve common problems when designing an application or system.

7. Personal Pattern Odyssey

8. Creational Patterns
Factory:
What kind of Quiz will we use, source of questions rather than behavior, e.g., JSONQuiz, SQLQuiz, …
Creation of quiz types deferred to factory, ask the factory for the quiz
Abstract Factory and Singleton classes
What is source of factory, e.g., web-based, SQL-based, internal
Don't permit creation, e.g., singleton class

9. What about the View?
How will we display multiple answers to user as part of Quiz?
Some concepts and ideas that might help?
Android concept of Fragment: part of Activity, but not a separate Screen, e.g., swappable on the same screen
Android concept of ListView, e.g., see documentation:
Simple? Just create two or four buttons?

10. Future Considerations
Questions displayed as images rather than strings: design and coding impact?
How do you know what correct answer is?
Do you query button for state? Other mechanisms?
Source of Quiz Questions
Once Quiz created, is question the same? Is ImageQuestion different?
Is QuizGenerator/QuizFactory Different?

11. Loading Quizzes/Questions
What might issues be in creating or using different Quiz/Questions sources, e.g., web, sql, other?
How will you manage some of these issues?
How will you know what Android provides versus what you create yourself?
Loaders:

12. Adding Functionality to QuizMaster
Branch is multi-questions
Walk through refactoring changes to Quiz, Question, QuizGenerator
Java-isms
Static initializers: purpose
Android-isms
Static naming conventions
What's left? Many things 