[RealCodingOtaku]

This, I set an alias for `adb` to use `"$XDG_DATA_HOME"/android` instead of `~/.android` because it stores the keys there for whatever reason. I would rather not see my home folder being cluttered with hidden files, it makes backing things up unnecessarily complex.

    export ANDROID_USER_HOME="$XDG_DATA_HOME"/android
    alias adb='HOME="$ANDROID_USER_HOME" adb'

[Avamander]

Don't forget Gradle ("GRADLE_USER_HOME") and OpenJDK ("-Djava.util.prefs.userRoot"), those too litter.