Recently I asked a question about Android. It was answered the next day. Now I would like to mark the question as answered or solved.
Is there a standard way to do it? If yes, where to find it?
On SE sites, you don't mark the question as solved – but you mark the answer as solution, so it stands out and can easily be identified by other people with a similar problem. The exact details are described in our help center: What should I do when someone answers my question? with a link to accept the answer and How to accept an answer.