Open Android Studio > App > build.gradle(Module:app)
Enter your Onesignal App id inside"onesignal_app_id"
onesignal_app_id ="Your onesignal_app_id"
How to Change One Signal Notification App Icon in Application?
How to Change One Signal Notification App Icon
Open Android Studio > app > res
Rename your icon with ic_stat_onesignal_default.png and ic_onesignal_large_icon_default.png paste in drawable-hdpi folders
How to find the package name?
Open Android Studio > app > build.gradle
How to Generate Signed APK?
Create New Keystore
Click Build > Generate Signed APK
Click On Create New or if you are updating app click choose existing
Select Keystore Path
Enter Keystore password and confirm password
Enter any name for the alias
Enter the key password and confirm password
Choose Validity Years
Fill rest of the details and click OK
Enter Keystore password, alias name, and key password and click next
Choose the signed APK destination
Tick the signatures
Note:- Please save the Keystore and remember the Keystore password, alias, and key password. If you want to update an app in future you have to use this Keystore. With new Keystore, you cannot update your app