Shall I start with C++ or Java for android app development?

Answer 1

Up to you actually
Because both of them can develope the android apps
This might be not the good answer sorry
I think you should start at java first :P
Then c++ for android

Answer 2

Both of them are good for android. But if you want to demonstrate to your friends you are a programmer, you should start with HTML because it's quite easy . Obviously HTML is not for android but in this way you can feel a programmer