https://jangwoojun.github.io/posts/%EC%95%88%EB%93%9C%EB%A1%9C%EC%9D%B4%EB%93%9C-EditText-%EC%A0%84%ED%99%94%EB%B2%88%ED%98%B8-%ED%95%98%EC%9D%B4%ED%94%88-%EA%B5%AC%EB%B6%84/