问题
Ok so I understand I can use the same keystore for multiple apps, but what about the same KEY or ALIAS? Should I use the same keystore AND same alias or key for all of my apps?
回答1:
You dont have to use the same alias for your apps. But for the same app when publishing updates my understanding is that you have to use the same keystore/alias. Now, which approach is better? Depends, however signing apps with the same key establishes the trust among your applications in sharing data. From android developer's website:
The Android system uses the certificate as a means of identifying the author of an application and establishing trust relationships between applications.
来源：https://stackoverflow.com/questions/25465868/same-keystore-but-different-keys-for-different-apps