Create a Model Class for Our Android Windchill Calculator Part 1
In an effort to reinforce the Model View Controller structure, I begin modifying the Windchill calculator by adding a class called Model, which we'll use for all data validation and modeling/manipulation.
In this video, we create the Model class and add two static methods: isEmpty() and isInRange() to check if an EditText is empty or not and whether a data point is within the proper range.