build signed app bundle in andriod studio flutter code example
Example 1: flutter build apk release target arm android
flutter build apk --release --target-platform=android-arm
Example 2: flutter build apk relese
keytool -genkey -v -keystore c:\Users\USER_NAME\key.jks -storetype JKS -keyalg RSA -keysize 2048 -validity 10000 -alias key