Android Code Organization

In this project we'll begin to explore keeping code well-organized into logical packages.

Objectives

• organize code between activities and models / classes
• explain the importance of packages for code organization
• learn how to keep code DRY

Instructions

Part 1 - Starter Code

Start with the assignment project in the current repo.

Part 2 - Add the appropriate packages

Add packages called:

1. application
2. model
3. ui
4. util

Move the existing app code to the appropriate packages.

Part 3 - Add the util methods

Open TextUtils and complete the util methods, as specified in the comments. You'll have to look at the documentation and examples for the NumberFormat class to complete this step.

Part 4 - Define a model class for a Product in the appropriate package

This model will represent a product we're selling and will include the normal characteristics of a product. Fields defined in this model should include:

1. productName - the product's name
2. productDescription - the product's description
3. productPrice - the product's price
4. productTax - the dollar-amount of tax for this item
5. productDiscount - the percent discount for this item

(Hint: You should use a Kotlin data class for the model.)

Part 5 - Open MainActivity and wire up the UI

You'll need to complete the displayProductDetails method in MainActivity.

1. Instantiate the model from Part 4. You can give your product any kind of name, description and other characteristics that you want.
2. Open the activity_main.xml layout and examine the pre-created TextView fields. Take note of their names.
3. In the displayProductDetails method you'll want to set the fields from your model into the appropriate TextViews in the layout.
4. Use the TextUtils you defined from Part 3
5. Display today's date in the orderDate TextView. Use the appropriate DateUtils method for formatting.
6. Search the code for any remaining TODO items, and fix any bugs.

Part 6 - Bonus Challenge

How would you make your model available to every screen in your Application? What are the pros and cons to doing this?