Hardcoded string "안녕하세요", should use @string resource
Hardcoding text attributes directly in layout files is bad for several reasons:
* When creating configuration variations (for example for landscape or portrait)you have to repeat the actual text (and keep it up to date when making changes)
* The application cannot be translated to other languages by just adding new translations for existing string resources. There are quickfixes to automatically extract this hardcoded string into a resource lookup.