App replacement even after change app name and apk file name?

Question

I start my android app writing with modifying some example codes from the internet. After some modification (Include the apk file name and the app name), I have a modified version app. When I wish to install the original example apk again, it has the message indicate that "Are you going to replace the app?" I think it want to use the original app to replace the modified version of app. What should I change so that Android won't think they are the same app?

Answer 1

Change the package name in the manifest.