Android Programming with Kotlin for Beginners

Summary

This was probably the most technical chapter so far. We explored threads, game loops, timing, using interfaces, and the Activity lifecycle – it's a very long list of topics to cram in.

If the exact interrelationship between these things is still not entirely clear, it is not a problem. All you need to know is that when the user starts and stops the app, the MainActivity class will handle starting and stopping the thread by calling the LiveDrawingView class's pause and resume functions. It achieves this through the overridden onPause and onResume functions, which are called by the OS.

Once the thread is running, the code inside the run function executes alongside the UI thread that is listening for user input. As we call the update and ...