Kotlin 라디오 버튼으로 항목 선택하고 텍스트 뷰에 보이게 하는 안드로이드 페이지 만들기 radio, TextView

activity_main.xml

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


    <RadioGroup
            android:id="@+id/radioGroup"
            android:layout_width="253dp"
            android:layout_height="207dp"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.55" app:layout_constraintVertical_bias="0.463">
        <RadioButton
                android:text="사과"
                android:checked="true"
                android:layout_width="match_parent"
                android:layout_height="71dp"
                android:id="@+id/radio1"/>
        <RadioButton
                android:text="바나나"
                android:layout_width="match_parent"
                android:layout_height="59dp"
                android:id="@+id/radio2"/>
        <RadioButton
                android:text="오렌지"
                android:layout_width="match_parent"
                android:layout_height="74dp"
                android:id="@+id/radio3"/>
    </RadioGroup>

    <TextView
            android:text="TextView"
            android:id="@+id/textView"
            android:layout_width="248dp"
            android:layout_height="73dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            android:layout_marginBottom="232dp"
            android:layout_marginTop="53dp"
            app:layout_constraintTop_toBottomOf="@+id/radioGroup"
            app:layout_constraintVertical_bias="0.043"
            app:layout_constraintHorizontal_bias="0.542"/>


</androidx.constraintlayout.widget.ConstraintLayout>

build.gradle(:app)

plugins {
    id 'com.android.application'
    id 'kotlin-android'
}

android {
    compileSdk 32

    defaultConfig {
        applicationId "com.example.sample11"
        minSdk 21
        targetSdk 32
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }

    buildFeatures{
        viewBinding true
    }

}

dependencies {

    implementation 'androidx.core:core-ktx:1.7.0'
    implementation 'androidx.appcompat:appcompat:1.4.1'
    implementation 'com.google.android.material:material:1.5.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

추가된 부분

buildFeatures{
    viewBinding true
}

 

MainActivity.kt

package com.example.sample11

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.RadioGroup
import android.widget.TextView
import com.example.sample11.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

    val binding by lazy { ActivityMainBinding.inflate(layoutInflater)}
	

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
       /* setContentView(binding.root) 
       build.gradle에서 추가된 부분인 viewBinding과 연결.
       binding 통해 모든 루트에 접근 가능
      

        binding.radioGroup.setOnCheckedChangeListener{group,checkID->
            Log.d("RadioButton","radio 버튼 클릭")
            when(checkID){
                R.id.radio1 -> binding.textView.text ="사과가 선택되었습니다."
                R.id.radio2 -> binding.textView.text ="바나나가 선택되었습니다."
                R.id.radio3 -> binding.textView.text ="오렌지가 선택되었습니다."
                //binding을 통해서 textView에 접근

            }
        }*/
        setContentView(R.layout.activity_main) 
        //binding.root 쓸 때는 못쓴다.

        val radioGroup = findViewById<RadioGroup>(R.id.radioGroup)
        val textView = findViewById<TextView>(R.id.textView)

            radioGroup.setOnCheckedChangeListener{_,checkedid->
                Log.d("RadioButton","radio 버튼 클릭")
                when(checkedid){
                    R.id.radio1 -> textView.text ="사과가 선택되었습니다."
                    R.id.radio2 -> textView.text ="바나나가 선택되었습니다."
                    R.id.radio3 -> textView.text ="오렌지가 선택되었습니다."

                }
            }

    }
}

결과 화면