- Open Gradle Scripts → build.gradle (Module: app)
- Change the application ID with your own id name
- Standard naming procedure : com.yourdomainname.yourappname
- Click Sync Now.
- Change the id as unique as possible, because application id is very important used if you want to publish the application to the google play.
- Click once on your package and then click setting icon on Android Studio.
- Close / Unselect Compact Empty Middle Packages
- Right click your package and rename it.