Warning:(6, 9) On SDK version 23 and up, your app data will be automatically backed up and restored on app install. Consider adding the attribute `android:fullBackupContent` to specify an `@xml` resource which configures which files to backup, or just set `android:fullBackupOnly=true`. More info: https://developer.android.com/guide/topics/data/autobackup 경고:(6, 9) SDK 버전 23 이상에서는 앱 설치 시 앱 데이터가 자..