posted 4 years ago
Yes, you can still program Android in Java. Although older Android code examples may be obsolete. I just upgraded an app of my own and it's still in Java.
However, you might be interested to know that Android Studio can automatically convert Java files to Kotlin. So you can learn Kotlin by seeing how your Java code translates.
It's worth learning Kotlin because Java can't do certain Android things as well as it might and Kotlin is being actively developed specifically to be more capable in Android. But at the moment Java is just fine.
The problem with getting rid of the "undesirables" is that sooner or later someone will decide that YOU are an undesirable.