@Blog

package com.example

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.text.Editable
import android.widget.EditText
import  android.text.TextWatcher
import android.util.Log
import android.widget.TextView

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        var editText = findViewById<EditText>(R.id.editTextTextN1)
        var textview = findViewById<TextView>(R.id.textView)
        editText.addTextChangedListener(object : TextWatcher {
            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {

            }

            override fun afterTextChanged(s: Editable?) {

            }

            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
                Log.d("テキストが入力されました","$s")
                textview.text = s.toString()
            }
        }
        )
    }
}