is it possible to get Visa on arrival , how much it cost and how many days can I stay in China?

If you are not under any emergency, you will be not able to get VOA in Xiamen. I advise you apply for the visa in your home country in advance. It takes 4 working days, and there is also express service. The fee is 300,000 Rupiah for a single entry one if you use the ordinary service.