Problem that i faced in 2021:
https://rick38yip.medium.com/aapt-error-failed-writing-to-r-txt-app-processdebugresources-android-studio-4-0-1-aug-2020-8f8bc2e06df9
https://medium.com/swlh/how-to-fix-the-error-invalid-main-apk-outputs-in-android-876d4b2640cb
private static final String TAG2 = Welcome.class.getSimpleName();
logd [TAB]
sout [TAB]
arrayName.fori [TAB]
arrayName.iter [TAB]
alt + Enter (split variable name)
alt + shift + up/down (move line)
ctrl + N (search in all classes)
shift + shift (search in all)