Widget - RadioButton

MainActivity.java

package com.ktds.myradiobutton;
 
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.Toast;
 
 
public class MainActivity extends ActionBarActivity {
 
    private RadioButton rdoStud;
    private RadioButton rdoTeac;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // setContentView가 xml 파일을 불러옴
        setContentView(R.layout.activity_main);
 
        rdoStud = (RadioButton) findViewById(R.id.rdoStud);
        rdoTeac = (RadioButton) findViewById(R.id.rdoTeac);
 
        rdoStud.setOnCheckedChangeListener(new MyRadioButtonListener());
        rdoTeac.setOnCheckedChangeListener(new MyRadioButtonListener());
    }
 
    private class MyRadioButtonListener implements RadioButton.OnCheckedChangeListener{
 
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
 
            if(isChecked){
                String message = String.format("%s 선택됨",buttonView.getText());
 
                /*  text를 보기위한 방법이 여러가지
                     1. getApplicationContext() : 현재 실행되고 있는 context(activity)
                     2. buttonView.getContext() : 현재 실행되고 있는 application의 context를 가져옴
                 */
                Toast.makeText(buttonView.getContext(), message, Toast.LENGTH_LONG).show();
            }
        }
    }
}
 

 

 activity_main.xml

<LinearLayout
    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:orientation="vertical"
    tools:context=".MainActivity">
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="직업을 선택하세요"
        android:id="@+id/textView"
        android:layout_gravity="center_horizontal"
        android:autoText="false" />
 
    <RadioGroup
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
 
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="학생"
            android:id="@+id/rdoStud" />
 
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="선생"
            android:id="@+id/rdoTeac"/>
    </RadioGroup>
</LinearLayout>