Dr. J's Android Development Lectures: Creating a Tip Calculator App

The famous (or infamous) tip calculator application is a common application for people to create learning Android development. In this lecture, I cover how to use ConstraintLayout - with margins, opposing constraints, constraint bias, edge alignment, vertical centering and more. I also cover event handling for both the Button (with the click event) and the Seek Bar (with the change event, when the seek bar thumb progresses back and forth). Further, I discuss View Binding (part of Android Jetpack), which is now the recommended way of accessing views by their identifiers (IDs) instead of the old findViewById method or using synthetic properties. It's quite simple to use - don't be intimidated!