RadioGroup实现单选并获得所选项值

上面是一个TextView，下面有个RadioGroup，布局如下：

主布局 main.xml：

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <!--第一个TextView -->
    <TextView
        android:id="@+id/myTextView"
        android:layout_width="228px"
        android:layout_height="49px"
        android:text="@string/str_radio_question1"
        android:textSize="30sp"
        />
    <!--建立一个RadioGroup -->
    <RadioGroup
        android:id="@+id/myRadioGroup"
        android:layout_width="137px"
        android:layout_height="216px"
        android:orientation="vertical">
        <!--第一个RadioButton -->
        <RadioButton
            android:id="@+id/myRadioButton1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/tr_radio_op1"
            />
        <!--第二个RadioButton -->
        <RadioButton
            android:id="@+id/myRadioButton2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/tr_radio_op2"
            />
    </RadioGroup>
</LinearLayout>

主控制程序 RadioGroupDemo.java：

package com.android.test;
 
import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
 
public class RadioGroupDemo extends Activity {
    public TextView mTextView1;
    public RadioGroup mRadioGroup1;
    public RadioButton mRadio1, mRadio2;
 
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
 
        // 取得 TextView、RadioGroup、RadioButton对象
        mTextView1 = (TextView) findViewById(R.id.myTextView);
        mRadioGroup1 = (RadioGroup) findViewById(R.id.myRadioGroup);
        mRadio1 = (RadioButton) findViewById(R.id.myRadioButton1);
        mRadio2 = (RadioButton) findViewById(R.id.myRadioButton2);
 
        // RadioGroup用OnCheckedChangeListener来运行
        mRadioGroup1.setOnCheckedChangeListener(mChangeRadio);
    }
 
    private RadioGroup.OnCheckedChangeListener mChangeRadio = new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            // TODO Auto-generated method stub
            if (checkedId == mRadio1.getId()) {
                // 把mRadio1的内容传到mTextView1
                mTextView1.setText(mRadio1.getText());
            } else if (checkedId == mRadio2.getId()) {
                // 把mRadio2的内容传到mTextView1
                mTextView1.setText(mRadio2.getText());
            }
        }
    };
}

　　需要注意的就是RadioGroup的消息处理。
mRadioGroup1.setOnCheckedChangeListener(mChangeRadio);

 

出处：http://www.android-study.com/jichuzhishi/369.html