Android - Build Release

Create keystore & generate signed aab or apk

In your Flutter project Select menu Tool > Flutter > Open Android module in Android Studio

It will open android project then after successful build select menu Build > Generate Signed Bundle/APK.. It open up popup select one option & click next

To generate signed AAB or APK first you've to create key store & store this at safe place for future app updates.If you generate first time signed AAB/APK then select create new

Create new key store select a folder where you want to store key store file & fill up other information.

Remember password you set here which required for next app update