I told them I can do everything from front end, back end, to iOS and mac app, just not Android. I don't like Android. Now they are assigning Android tasks to me, I am working like shit and very unhappy.

Am I not professional or is this ok?

What language

This is inhuman. Basically communism under stalin. "You shall be given money and you shall learn skills for the company. You asking for personal preference is selfish and anti company". You should talk with your boss or get out asap. Who wants unhappy life. It's too short.