- Manifest package name and application id are two different things. Don't be confused because they are same when project is created.
- You can change the manifest package name any time after even uploaded on playstore.(Only manifest package name). Because it is related to your java classes.
- Application id is created by gradle. Apk will have the application id finally which you have written in gradle.
So you can't change your gradle application id but you can change manifest package name when you have released build on playstore.
You can change package name com.codecanyon.advanceclassified
to com.myapp
but don't change applicationId."
Update:
After understanding your senario, you can do this.
- You need not to change package name of java classes in manifest.
- You just change application Id as same as your previous app on playstore. and you are good to go. :)