라즈이노 iOT

val binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)

class Profile ( val picture : Int , val name : String , val telNum : String , val email : String , val birthDay : String )

package com.example.recyclerview3
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView

class ProfileAdapter ( val profileList: ArrayList<Profile> ) : RecyclerView.Adapter<ProfileAdapter.CustomViewHolder> ( )
{
    class CustomViewHolder (itemView: View) : RecyclerView.ViewHolder(itemView){    // : RecyclerView... 를 상속 받아 CustomViewHolder class를 작성함.
        val picture = itemView.findViewById<ImageView>(R.id.iv_profile)    // 인물 사진
        val name = itemView.findViewById<TextView>(R.id.tv_name)           // 이름
        val telNum = itemView.findViewById<TextView>(R.id.tv_number)       // 전화번호
        val email = itemView.findViewById<TextView>(R.id.tv_email)         // 이메일
        val birthday = itemView.findViewById<TextView>(R.id.tv_birthday)   // 생일
    }

    override fun onCreateViewHolder( parent: ViewGroup, viewType: Int ): ProfileAdapter.CustomViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.list_item, parent, false)   // parent에 있는 모든 정보(context)를 가져오는 설정 함.
        return CustomViewHolder(view)   // view 형태를 첨부 하여 위에서 정의한 CustomViewHolder( )를 리턴(호출) 함.
    }

    override fun onBindViewHolder(holder: ProfileAdapter.CustomViewHolder, position: Int) {
        holder.picture.setImageResource(profileList.get(position).picture)   // (MainActivity에서 데이터를 받아서) profileList에서 손으로 클릭(터치)되는 위치에 대한 정보를 가져옴.
        holder.name.text = profileList.get(position).name             // position 값은 데이터 0 부터 시작 됨.
        holder.telNum.text = profileList.get(position).telNum         // 만약 유형이 Int 숫자라면, 코드 마지막에 숫자를 문자열로 변환하는 코드를( '.toString()' ) 삽입해주면 에러나지 않음.
        holder.email.text = profileList.get(position).email
        holder.birthday.text = profileList.get(position).birthDay
    }

    override fun getItemCount(): Int {
        return profileList.size    // profileList의 총 데이터 갯수를 반환함.
    }
}

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

val profileList = arrayListOf(
    Profile(R.drawable.woman1, "유관순", "010-0808-1515", "korea@korea.com" , "08.15"),
    Profile(R.drawable.man1, "홍길동", "010-1234-5678", "gildong@chosun.com" , "03.05"),
    Profile(R.drawable.man2, "유재석", "010-7777-8888", "leejs@naver.com" , "07.07"),
    Profile(R.drawable.woman2, "엘사", "010-3333-9999", "elsa@gmail.com" , "12.25"),
    Profile(R.drawable.man3, "모피어스", "010-2222-3434", "morpheus@gmail.com" , "07.12"),
    Profile(R.drawable.man4, "네오", "010-0505-4040", "gildong@chosun.com" , "28.05"),
    Profile(R.drawable.woman3, "지예은", "010-2323-9090", "yeeun@daum.net" , "03.08"),
    Profile(R.drawable.man5, "정상훈", "010-5555-7878", "jeong@snlkorea.com" , "11.30"),
    Profile(R.drawable.woman4, "이수지", "010-3030-7080", "suji@snlkorea.com" , "06.20"),
    Profile(R.drawable.woman5, "김슬기", "010-4747-5656", "seulgi@snlkorea.com" , "28.05"),
)

binding.rvProfile.layoutManager = LinearLayoutManager(this, LinearLayoutManager.H VERTICAL, false)
binding.rvProfile.setHasFixedSize(true)  // 리사이클러뷰에 대한 성능개선 관련
binding.rvProfile.adapter = ProfileAdapter(profileList)

package com.example.recyclerview3

import android.os.Bundle
import androidx.activity.enableEdgeToEdge
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat
import androidx.recyclerview.widget.LinearLayoutManager
import com.example.recyclerview3.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        val profileList = arrayListOf(
            Profile(R.drawable.woman1, "유관순", "010-0808-1515", "korea@korea.com" , "08.15"),
            Profile(R.drawable.man1, "홍길동", "010-1234-5678", "gildong@chosun.com" , "03.05"),
            Profile(R.drawable.man2, "유재석", "010-7777-8888", "leejs@naver.com" , "07.07"),
            Profile(R.drawable.woman2, "엘사", "010-3333-9999", "elsa@gmail.com" , "12.25"),
            Profile(R.drawable.man3, "모피어스", "010-2222-3434", "morpheus@gmail.com" , "07.12"),
            Profile(R.drawable.man4, "네오", "010-0505-4040", "gildong@chosun.com" , "28.05"),
            Profile(R.drawable.woman3, "지예은", "010-2323-9090", "yeeun@daum.net" , "03.08"),
            Profile(R.drawable.man5, "정상훈", "010-5555-7878", "jeong@snlkorea.com" , "11.30"),
            Profile(R.drawable.woman4, "이수지", "010-3030-7080", "suji@snlkorea.com" , "06.20"),
            Profile(R.drawable.woman5, "김슬기", "010-4747-5656", "seulgi@snlkorea.com" , "28.05"),
        )
            binding.rvProfile.layoutManager = LinearLayoutManager(this, LinearLayoutManager.H VERTICAL, false)
            binding.rvProfile.setHasFixedSize(true)  // 리사이클러뷰에 대한 성능개선 관련
            binding.rvProfile.adapter = ProfileAdapter(profileList)
    }
}

override fun onCreateViewHolder( parent: ViewGroup, viewType: Int ): ProfileAdapter.CustomViewHolder {
    val view = LayoutInflater.from(parent.context).inflate(R.layout.list_item, parent, false)   // parent에 있는 모든 정보(context)를 가져오는 설정 함.
    return CustomViewHolder(view).apply {
        itemView.setOnClickListener {
            val cursorPosition : Int = adapterPosition
            val profile : Profile = profileList.get(cursorPosition)
            Toast.makeText(parent.context, "-이름:${profile.name} [전화번호: ${profile.telNum}] \n-E메일: ${profile.email}", Toast.LENGTH_SHORT).show()
        }
    }
}

override fun onCreateViewHolder( parent: ViewGroup, viewType: Int ): ProfileAdapter.CustomViewHolder {
    val view = LayoutInflater.from(parent.context).inflate(R.layout.list_item, parent, false)   // parent에 있는 모든 정보(context)를 가져오는 설정 함.
    return CustomViewHolder(view).apply {
        itemView.setOnClickListener {
            val cursorPosition : Int = adapterPosition
            val profile : Profile = profileList.get(cursorPosition)
            val intent = Intent(Intent.ACTION_DIAL)
            intent.data = Uri.parse("tel:${profile.telNum}")
            itemView.context.startActivity(intent)
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- solid로 색상 변경 -->
    <solid android:color="#FFEB3B" />
    <!-- 0dp는 모서리를 사각형으로 만듭니다 -->
    <corners android:radius="80dp" />
    <!-- 테두리 굵기와 색상 주기-->
    <stroke android:width="8dp" android:color="#85790C"/>
</shape>

<?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android="http://schemas.android.com/apk/res/android">
        <!-- solid로 색상 변경 -->
        <solid android:color="#FF9800" />
        <!-- 0dp는 모서리를 사각형으로 만듭니다 -->
        <corners android:radius="50dp" />
        <!-- 테두리 굵기와 색상 주기-->
        <stroke android:width="5dp" android:color="#FF5722"/>
    </shape>

<?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android="http://schemas.android.com/apk/res/android">
        <!-- solid로 색상 변경 -->
        <solid android:color="#2196F3" />
        <!-- 0dp는 모서리를 사각형으로 만듭니다 -->
        <corners android:radius="25dp" />
        <!-- 테두리 굵기와 색상 주기-->
        <stroke android:width="10dp" android:color="#3F51B5"/>
    </shape>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- solid로 색상 변경 -->
    <solid android:color="#aa4444" />
    <!-- 0dp는 모서리를 사각형으로 만듭니다 -->
    <corners android:radius="0dp" />
    <!-- 테두리 굵기와 색상 주기-->
    <stroke android:width="10dp" android:color="#ffaa55"/>
</shape>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:weightSum="5"
    android:layout_margin="10dp"
    tools:context=".MainActivity">
    <Button
        android:id="@+id/btn1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:layout_weight="1"
        android:textStyle="bold"
        android:textColor="#FFFFFF"
        android:textSize="20dp"
        android:text="버튼 스타일 1" />
    <androidx.appcompat.widget.AppCompatButton
        android:id="@+id/btn2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:layout_weight="1"
        android:textStyle="bold"
        android:background="@drawable/square_btn1"
        android:textColor="#000000"
        android:textSize="20dp"
        android:text="버튼 스타일 2" />
    <androidx.appcompat.widget.AppCompatButton
        android:id="@+id/btn3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:layout_weight="1"
        android:textStyle="bold"
        android:background="@drawable/square_btn2"
        android:textColor="#FFFFFF"
        android:textSize="20dp"
        android:text="버튼 스타일 3" />
    <androidx.appcompat.widget.AppCompatButton
        android:id="@+id/btn4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:layout_weight="1"
        android:textStyle="bold"
        android:background="@drawable/square_btn3"
        android:textColor="#FFFFFF"
        android:textSize="20dp"
        android:text="버튼 스타일 4" />
    <androidx.appcompat.widget.AppCompatButton
        android:id="@+id/btn5"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:layout_weight="1"
        android:textStyle="bold"
        android:background="@drawable/square_btn4"
        android:textColor="#FFFFFF"
        android:textSize="20dp"
        android:text="버튼 스타일 5" />
</LinearLayout>

package com.example.btnstyle

import android.os.Bundle
import android.widget.Toast
import androidx.activity.enableEdgeToEdge
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat
import com.example.btnstyle.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)
        binding.btn1.setOnClickListener {
            Toast.makeText(this, "초기 설정된 기본 스타일입니다", Toast.LENGTH_SHORT).show()
        }
        binding.btn2.setOnClickListener {
            Toast.makeText(this, "-컬러:#FFEB3B \n-테두리(Radius): 80dp -두께: 8dp", Toast.LENGTH_LONG).show()
        }
        binding.btn3.setOnClickListener {
            Toast.makeText(this, "-컬러:#FF9800 \n-테두리(Radius): 50dp -두께: 5dp", Toast.LENGTH_LONG).show()
        }
        binding.btn4.setOnClickListener {
            Toast.makeText(this, "-컬러:#2196F3 \n-테두리(Radius): 25dp -두께: 10dp", Toast.LENGTH_LONG).show()
        }
        binding.btn5.setOnClickListener {
            Toast.makeText(this, "-컬러:#aa4444 \n-테두리(Radius): 0dp -두께: 10dp", Toast.LENGTH_LONG).show()
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#D1DB6E"
    tools:context=".intro">

    <TextView
        android:id="@+id/textView"
        android:layout_width="189dp"
        android:layout_height="107dp"
        android:gravity="center"
        android:singleLine="false"
        android:text="안녕하세요~!\n인트로 화면입니다.\n 5초 뒤에 사라집니다"
        android:textColor="#F44336"
        android:textSize="20dp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

class intro : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_intro)

        Handler(Looper.getMainLooper()).postDelayed({
            val intent = Intent(this@intro, MainActivity::class.java)
            startActivity(intent)
            finish()
        }, 5000)
    }
}

import android.os.Handler

package com.example.intropage

import android.content.Intent
import android.os.Bundle
import android.os.Handler
import android.os.Looper
import androidx.activity.enableEdgeToEdge
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat

class intro : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_intro)

        Handler(Looper.getMainLooper()).postDelayed({
            val intent = Intent(this@intro, MainActivity::class.java)
            startActivity(intent)
            finish()
        }, 5000)
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.IntroPage"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="false" />
        <activity
            android:name=".intro"
            android:exported="true" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#D1DB6E"
    tools:context=".intro">

    <TextView
        android:id="@+id/textView"
        android:layout_width="189dp"
        android:layout_height="107dp"
        android:gravity="center"
        android:singleLine="false"
        android:text="안녕하세요~!\n인트로 화면입니다.\n 5초 뒤에 사라집니다"
        android:textColor="#F44336"
        android:textSize="20dp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#2233aa"
    tools:context=".frag1">

    <TextView
        android:id="@+id/txtview_frag1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text= "Frag 1 page"
        android:textSize="20dp"
        android:textStyle="bold"
        android:textColor="@color/white"/>

</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#A51EB4"
    tools:context=".frag2">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text= "Frag 2 page"
        android:textSize="20dp"
        android:textStyle="bold"
        android:textColor="@color/white"/>

</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FF9800"
    tools:context=".frag3">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text= "Frag 3 page"
        android:textSize="20dp"
        android:textStyle="bold"
        android:textColor="@color/white"/>

</FrameLayout>

package com.example.fragment

import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup

// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private const val ARG_PARAM1 = "param1"
private const val ARG_PARAM2 = "param2"

/**
 * A simple [Fragment] subclass.
 * Use the [frag1.newInstance] factory method to
 * create an instance of this fragment.
 */
class frag1 : Fragment() {
    // TODO: Rename and change types of parameters
    private var param1: String? = null
    private var param2: String? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        arguments?.let {
            param1 = it.getString(ARG_PARAM1)
            param2 = it.getString(ARG_PARAM2)
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_frag1, container, false)
    }

    companion object {
        /**
         * Use this factory method to create a new instance of
         * this fragment using the provided parameters.
         *
         * @param param1 Parameter 1.
         * @param param2 Parameter 2.
         * @return A new instance of fragment frag1.
         */
        // TODO: Rename and change types and number of parameters
        @JvmStatic
        fun newInstance(param1: String, param2: String) =
            frag1().apply {
                arguments = Bundle().apply {
                    putString(ARG_PARAM1, param1)
                    putString(ARG_PARAM2, param2)
                }
            }
    }
}

package com.example.fragment

import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup

class frag1 : Fragment() {

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_frag1, container, false)
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <FrameLayout
        android:id="@+id/main_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toTopOf="@+id/linearLayout"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"></FrameLayout>

    <LinearLayout
        android:id="@+id/btn_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:weightSum="3"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/main_view">

        <Button
            android:id="@+id/btn1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:layout_weight="1"
            android:text="1번"
            android:textSize="20dp"
            android:textStyle="bold" />

        <Button
            android:id="@+id/btn2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:layout_weight="1"
            android:text="2번"
            android:textSize="20dp"
            android:textStyle="bold" />

        <Button
            android:id="@+id/btn3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:layout_weight="1"
            android:text="3번"
            android:textSize="20dp"
            android:textStyle="bold" />
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

package com.example.fragment

import android.os.Bundle
import androidx.activity.enableEdgeToEdge
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat
import com.example.fragment.databinding.ActivityMainBinding
import com.example.fragment.databinding.FragmentFrag1Binding

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding = ActivityMainBinding.inflate(layoutInflater)        
        setContentView(binding.root)
        binding.btn1.setOnClickListener {
            supportFragmentManager.beginTransaction().replace(R.id.main_view, frag1()).commit()
        }
        binding.btn2.setOnClickListener {
            supportFragmentManager.beginTransaction().replace(R.id.main_view, frag2()).commit()
        }
        binding.btn3.setOnClickListener {
            supportFragmentManager.beginTransaction().replace(R.id.main_view, frag3()).commit()
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffaaff"
    tools:context=".frag1">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:src="@drawable/lake1"
        android:background="#22aabb" />

</FrameLayout>

val binding = ActivityMainBinding.inflate(layoutInflater)

binding.txtview.setText("클릭했음")

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding = ActivityMainBinding.inflate(layoutInflater)        
        setContentView(binding.root)
        binding.btn1.setOnClickListener {
        	binding.txtview.setText("클릭했음")
        }