Android:RadioButton/RadioGroup

XML layout

  <RadioGroup

        android:id="@+id/radioGroup1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" >

        <RadioButton

            android:id="@+id/radio0"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:checked="true"

            android:text="test1" />

        <RadioButton

            android:id="@+id/radio1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="test2" />

    </RadioGroup>

Source Code

package com.radio;

//與CheckBox差在RadioButton常用於單選選項

import android.app.Activity;

import android.os.Bundle;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.RadioGroup.OnCheckedChangeListener;

import android.widget.Toast;

public class Radio2Activity extends Activity {

/** Called when the activity is first created. */

RadioGroup rg;

RadioButton rb1, rb2;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

rg = (RadioGroup) findViewById(R.id.radioGroup1);

rb1 = (RadioButton) findViewById(R.id.radio0);

rb2 = (RadioButton) findViewById(R.id.radio1);

rg.setOnCheckedChangeListener(new OnCheckedChangeListener() {

/*

* arg1本身為整數型別，此整數代表原件於R.java之編號，

* 因此可以用於判斷使用者按下哪個RadioButton，以getId()方法

*/

public void onCheckedChanged(RadioGroup arg0, int arg1) {

// TODO Auto-generated method stub

if (arg1 == rb1.getId()) {

Toast.makeText(Radio2Activity.this, "test1", 3000).show();

} else if (arg1 == rb2.getId()) {

Toast.makeText(Radio2Activity.this, "test2", 3000).show();

}

}

});

}

}