I have two projects (A, B) with the same package name. One of them, I used Eclipse's Android tool or java's help tool to generate a key in the bin directory and sign it, successfully exported the APK, and then successfully installed it on the mobile phone. I didn't sign the project manually, so I debugged it with Eclipse. Then copy the APK file from his project bin directory and install it on the mobile phone. As a result, the original program I signed was changed to a different program. According to the online tutorial, the signature is unique, the package name is the same, and programs with different signatures cannot be modified or replaced.

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