The rudimentary volume adjust in iTunes is stored and works only within iTunes and iTunes (the Windows programme) does not work with Android devices anyway. To create a consistent volume across all songs in a playlist you would actually need to adjust every song in your library as well as adjusting any additions made after that work. It's a big task and requires a third-party app (or programme).
Stepping back a bit, I don't know what you're using since there is (as far as I know) no "iTunes for Android", but since you are using an Android device there is no need for your to use iTunes at all.