I'm going to create a server API, but I don't want to serve someone else 
except apks signed by my certificate, because my API need a lot of server 
resource.
In my opinion, this kind of requirement is common. Finally, I found 
google's map api is design well. Google map api use a API key which link 
with the certificate of the app. If someone who don't have the original 
certificate, decompile the apk and change it, then the apk won't work.But I 
don't know how google verify the app certificate when apk call the map API. 
Or any other best pratice to do this.

Don

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