Flutter Android Google Play Store Release Issues API Level 29 and com.example is restricted

Getting the Key figured out

The keystore password and the other password are *the same* by default, but you need the right kind of key for it to work:

keytool -genkey -v -keystore ~/upload-keystore.jks -keyalg RSA -keysize 2048 -validity 10000 -alias upload -storetype JKS

This worked, but the error message has stuck in my mind:

The JKS keystore uses a proprietary format. It is recommended to migrate to PKCS12 which is an industry standard format using "keytool -importkeystore -srckeystore /Users/john.maeda/upload-keystore.jks -destkeystore /Users/john.maeda/upload-keystore.jks -deststoretype pkcs12"

Fixing the API level

In your Flutter project open build.gradle file which is located at android/app/build.gradle and change the targetSdkVersion to 30 or higher:

defaultConfig {
    applicationId "com.example.dev"
    minSdkVersion 21
    targetSdkVersion 30
    versionCode flutterVersionCode.toInteger()
    versionName flutterVersionName
}

Fixing the com.example issue

In your Flutter project open build.gradle file which is located at android/app/build.gradle and change the targetSdkVersion to 30 or higher:

defaultConfig {
    applicationId "com.blahblahblahunique.dev"
    minSdkVersion 21
    targetSdkVersion 30
    versionCode flutterVersionCode.toInteger()
    versionName flutterVersionName
}