China visa and Hong Kong visa for Indonesian passport holder

Hi,

I would like to ask whether I need to apply for tourist visa for 5 days visit to Xiamen and Hong Kong or not.

I have bought the two way ticket. the origin is from singapore.

I wonder whether it is possible to fly from singapore to xiamen and HK and same time to apply for visa if i need one.

Please advice me.
thank you.

rgds,
Me Me