Release Build
It gives information on how to create a Keystore and APK for the release.
If you have an existing keystore, skip to the next step. If not, create one by running the following at the command line:
keytool -genkey -v -keystore ~/key.jks -keyalg RSA -keysize 2048 -validity 10000 -alias key** $ flutter build apk --release
** $ flutter build --release