<안드로이드 스터디 03> 라디오 버튼을 누르면 토스트 띄우기

1. XML 코드

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <RadioGroup
        android:id="@+id/RadioGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="196dp"
        android:layout_marginTop="282dp"
        android:layout_marginEnd="106dp"
        android:layout_marginBottom="305dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <RadioButton
            android:id="@+id/RadioApple"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="사과" />

        <RadioButton
            android:id="@+id/RadioOrange"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="오렌지" />

        <RadioButton
            android:id="@+id/RadioBanana"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="바나나" />

    </RadioGroup>
</androidx.constraintlayout.widget.ConstraintLayout>

 

 

2. 코틀린 코드

package com.android.myapplication

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.RadioButton
import android.widget.RadioGroup
import android.widget.Toast

class MainActivity : AppCompatActivity() {
//////////변수선언/////////////////

    lateinit var RadioGroup : RadioGroup
lateinit var RadioApple : RadioButton
lateinit var RadioOrange : RadioButton
lateinit var RadioBanana : RadioButton

/////////////////////////////////

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        RadioGroup = findViewById(R.id.RadioGroup)
        RadioApple = findViewById(R.id.RadioApple)
        RadioOrange = findViewById(R.id.RadioOrange)
        RadioBanana = findViewById(R.id.RadioOrange)

        RadioGroup.setOnCheckedChangeListener{group, checkedId ->
            when(checkedId){
            R.id.RadioApple -> Toast.makeText(applicationContext, "사과", Toast.LENGTH_SHORT).show()
                R.id.RadioOrange ->Toast.makeText(applicationContext, "오렌지", Toast.LENGTH_SHORT).show()
                R.id.RadioBanana -> Toast.makeText(applicationContext, "바나나", Toast.LENGTH_SHORT).show()
            }
        }


    }



}

3. 결과화면

 

4. 하고싶은 말

라디오버튼은 라디오그룹으로 묶어서 사용하는 것을 알게 되었다.

또한 토스트를 띄우는 코드가 체크박스와는 약간 차이가 있다.