Android编程开发之RadioGroup用法实例

package com.example.lesson16_radio;import android.app.Activity;import android.os.Bundle;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.Toast;public class MainActivity extends Activity { private RadioGroup group_temo; private RadioButton checkRadioButton; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  group_temo = (RadioGroup) findViewById(R.id.radioGroup1);  // 改变默认选项  group_temo.check(R.id.radio1);  // 获取默认被被选中值  checkRadioButton = (RadioButton) group_temo.findViewById(group_temo    .getCheckedRadioButtonId());  Toast.makeText(this, "默认的选项的值是:" + checkRadioButton.getText(),    Toast.LENGTH_LONG).show();  // 注册事件  group_temo    .setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {     @Override     public void onCheckedChanged(RadioGroup group, int checkedId) {      // 点击事件获取的选择对象      checkRadioButton = (RadioButton) group_temo        .findViewById(checkedId);      Toast.makeText(getApplicationContext(),        "获取的ID是" + checkRadioButton.getText(),        Toast.LENGTH_LONG).show();     }    }); }}

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <RadioGroup  android:id="@+id/radioGroup1"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_alignParentLeft="true"  android:layout_alignParentRight="true"  android:layout_alignParentTop="true" >  <RadioButton   android:id="@+id/radio0"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:checked="true"   android:text="@string/text_java" />  <RadioButton   android:id="@+id/radio1"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:text="@string/text_net" />  <RadioButton   android:id="@+id/radio2"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:text="@string/text_php" /> </RadioGroup></RelativeLayout>