Loops demo app

To get started, create a new Android project called Loops, use the Empty Activity template, and leave all the other settings at their default.

Let's add a few buttons to our UI to make this more fun. Switch to the activity_main.xml file and make sure you are on the Design tab, and then follow these steps:

1. Drag a button onto the UI and center it horizontally near the top.
2. In the properties window, change the text property to Count Up.
3. In the properties window, change the onClick property to countUp.
4. Place a new button just below the previous one and repeat steps 2 and 3 but this time use Count Down for the text property and countDown for the onClick property.
5. Place a new button just below the previous one and repeat steps 2 and 3 but this time use nested for the text property and the onClick property.
6. Click the Infer Constraints button to constrain the three buttons in position.

Looks are not important for this demo but run the...