uses-sdk:minSdkVersion 16 cannot be smaller than version 19 declared in library [:google_mobile_ads] ..../AndroidManifest.xml as the library might be using APIs not available in 16 Suggestion: use a compatible library with a minSdk of at most 16, or increase this project's minSdk version to at least 19, or use tools:overrideLibrary="io.flutter.plugins.googlemobileads" to force usage (may lead to runtime failures) 에러가 친절하게 minSdk를 고치라고 알려줬다. minSdk는 안드로이드 build gradle에 minsdkversion 고치면 된다고한다. https://stackoverflow.com/questions/52060516/how-to-change-android-minsdkversion-in-flutter-project --- ..안드로이드만 바꿔도 되는건가?