ionic cordova build android --prod --release
keytool -genkey -v -keystore my-release-key.keystore -alias alias_name -keyalg RSA -keysize 2048 -validity 10000
jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore my-release-key.keystore app-release-unsigned.apk alias_name
zipalign -v 4 C:\PATH_TO_UNSIGNED_APK\app-release-unsigned.apk C:\PATH_WHERE_YOU_WANT_TO_GENERATE_NEW_APK\Name_Of_New_APK.apk