In Android Studio, you can do this:

For example, if you want to change com.example.app to my.awesome.game, then:

1. In your Project pane, click on the little gear icon ( )
2. Uncheck / De-select the Compact Empty Middle Packages option

3. Your package directory will now be broken up in individual directories
4. Individually select each directory you want to rename, and:
   • Right-click it
   • Select Refactor
   • Click on Rename
   • In the Pop-up dialog, click on Rename Package instead of Rename Directory
   • Enter the new name and hit Refactor
   • Allow a minute to let Android Studio update all changes
   • Note: When renaming com in Android Studio, it might give a warning. In such case, selectRename All

5. Now open your Gradle Build File (build.gradle – Usually app or mobile). Update the applicationId to your new Package Name and Sync Gradle, if it hasn’t already been updated automatically:

6. Done! Anyways, Android Studio needs to make this process a little simpler.