RadioGroup实现单选并获得所选项内容

RadioGroup 有时候比较有用．主要特征是给用户提供多选一机制．现在要绘制一个画面．

举例如下：

顶上是一个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" > <!--第一個TextView --> <TextView android:id="@+id/myTextView" android:layout_width="228px" android:layout_height="49px" android:text="@string/str_radio_question1" android:textSize="30sp" /> <!--建立一個RadioGroup --> <RadioGroup android:id="@+id/myRadioGroup" android:layout_width="137px" android:layout_height="216px" android:orientation="vertical" > <!--第一個RadioButton --> <RadioButton android:id="@+id/myRadioButton1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/tr_radio_op1" /> <!--第二個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);