Android : Duplicate registration for activity com.example.abc

Duplicate registration for activity com.example.abc

The above error message means that you have added the same Activity tag/reference in AndroidManifest.xml file more than once. You must register an Activity only once in the manifest file. If you go to Android Preference and look for the lint error related to "Activity registered more than once" you will find the below statement.

✌️ An activity should only be registered once in the manifest. If it is accidentally registered more than once, then subtle errors can occur, since attribute declarations from the two elements are not merged, so you may accidentally remove previous declarations.

This kind of error has a severity of type Error in Android Lint.

So the solution is to check for any duplicate declarations you have for any Activity in your App Manifest file and remove it, Clean and build your project to resolve the issue.