진짜중요! firestore 오류해결

Unhandled Exception: MissingPluginException(No implementation found for method DocumentReference#snapshots on channel plugins.flutter.io/firebase_firestore)

이거 minSdk를 21로, targetSdk를 29바꿔서 해결

• multidex true도 주의! (여러개 패키지 설치할때)

  defaultConfig {
      // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
      applicationId "com.mindnetwork.chat_planner_app"
      minSdkVersion 21
      targetSdkVersion 29
      versionCode flutterVersionCode.toInteger()
      versionName flutterVersionName
      multiDexEnabled true
  
  }
  
  buildTypes {
      release {
          // TODO: Add your own signing config for the release build.
          // Signing with the debug keys for now, so `flutter run --release` works.
          signingConfig signingConfigs.debug
      }
  }

  }

flutter {
source '../..'
}

dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

implementation platform('com.google.firebase:firebase-bom:28.1.0')
implementation 'com.google.firebase:firebase-analytics'
implementation 'com.android.support:multidex:1.0.3'

}