Package Name
The package name of an Android app uniquely identifies your app on the device, in Google Play Store and in supported third-party Android stores.
Step 1
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.

Step 2
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.

Step 3
If you use OneSignal for sending push notification, you must manually change the NotificationServiceExtension value in the AndroidManifest.xml according to your package name
<meta-data
android:name="com.onesignal.NotificationServiceExtension"
android:value="<your_package_name>.notification.NotificationServiceExtension" />

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