Change Application Package Name

To change the package name, follow the following steps

• In your Project pane, click on the little gear icon

• Uncheck the Compact Empty Middle Packages option

• Your package directory will now be broken up into individual directories

• 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

  • Click Do Refactor in the bottom

  • 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, select >Rename All

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

• 
• You may need to change the package= attribute in your manifest file.

• Clean and Rebuild. Done.

Important : your applicationId or package name must same with your package name that you’ve create on firebase console when you generate google-services.json