Migrate to AndroidX#18

mcampochiaro wants to merge 4 commits intobauerjj:masterbauerjj/Android-Simple-Bluetooth-Example:masterfrom

mcampochiaro:AndroidStudio_Chipmunk2021.2.1mcampochiaro/Android-Simple-Bluetooth-Example:AndroidStudio_Chipmunk2021.2.1Copy head branch name to clipboard