코틀린 EditText 글자 입력 체크 ( TextWatcher )

etv_email_signUp.addTextChangedListener (object: TextWatcher {
            override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
                if (p0 != null && p0.isNotEmpty()) {
                    Log.d("로그", "beforeTextChanged p0 : $p0")
                    Log.d("로그", "beforeTextChanged p0 last : ${p0.last()}")
                }
            }

            override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
                if (p0 != null && p0.isNotEmpty()) {
                    Log.d("로그", "onTextChanged p0 : $p0")
                    Log.d("로그", "onTextChanged p0 last : ${p0.last()}")
                }
            }

            override fun afterTextChanged(p0: Editable?) {
                if (p0 != null && p0.isNotEmpty()) {
                    Log.d("로그", "afterTextChanged p0 : $p0")
                    Log.d("로그", "afterTextChanged p0 last : ${p0.last()}")
                }
            }
        })

asd를 입력하면

아래와 같은 순서로 나타난다.

onTextChanged >> afterTextChanged >> beforeTextChanged