Animations demo app – introducing SeekBar

That's enough theory, especially with something that should be so visible. Let's build an animation demo app that explores everything we have just discussed, and a bit more as well.

This app involves small amounts of code in lots of different files. Therefore, I have tried to make it plain what code is in what file, so you can keep track of what is going on. This will make the Kotlin we write for this app more understandable as well.

The app will demonstrate rotations, fades, translations, animation events, interpolations, and controlling duration with a SeekBar widget. The best way to explain what SeekBar does is to build it and then watch it in action.

Laying out the animation demo

Create a new project called Animation Demo using the Empty Activity template, leaving all the other settings at their usual settings. As usual, should you wish to speed things up by copying and pasting the layout, the code, or the animation XML, it can...