you have to escape the GFW (great firewall of China). use FanQiang (VPN) to access the "google paly"
We are looking into providing better access to Drone Harmony from China. The map services is one area, that currently is not ideal. China Gov <-> Google Map services do not get along that well.
I am in Ireland...not in China. I actually down graded the Google Play Services, and then the map can be shown, but the app cannot connect to drone...
try to check whether you set the correct drone type