info:
- https://developer.android.com/codelabs/basic-android-kotlin-training-first-kotlin-program?continue=https%3A%2F%2Fdeveloper.android.com%2Fcourses%2Fpathways%2Fandroid-basics-kotlin-one%23codelab-https%3A%2F%2Fdeveloper.android.com%2Fcodelabs%2Fbasic-android-kotlin-training-first-kotlin-program#2
- https://developer.android.com/develop/ui
- https://github.com/android/views-widgets-samples
- https://commonsware.com/Android/
- https://android.googlesource.com/platform/development/+/master/samples
- https://stackoverflow.com/questions/4938822/how-can-i-use-the-animation-framework-inside-the-canvas
gradle versions: