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flutter clean
flutter build apk
After you run the command go to build->apps->output->apk
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--BUILD APK IN FLUTTER--
flutter build apk --split-per-abi --no-tree-shake-icons
-- BUILD WEB IN FLUTTER --
flutter build web --release --web-renderer html
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keytool -genkey -v -keystore ~/upload-keystore.jks -keyalg RSA -keysize 2048 -validity 10000 -alias upload