Android中RadioGroup组与onCheckedChanged事件
例子效果图：
实现步骤：
第一步：建立Android 工程：RadioGroupDemo。
第二步：编写Activity 的子类别：RadioGroupDemo，其程序代码如下：
package com.a3gs.radiogroup;
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 {
private TextView TV;
private RadioGroup RG;
private RadioButton RB1, RB2;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TV = (TextView) findViewById(R.id.TV);
RG = (RadioGroup) findViewById(R.id.RG);
RB1 = (RadioButton) findViewById(R.id.rb1);
RB2 = (RadioButton) findViewById(R.id.rb2);
RG.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener(){
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
if(checkedId == RB1.getId()){
TV.setText("您所选择的是：" + RB1.getText().toString());
}
if(checkedId == RB2.getId()){
TV.setText("您所选择的是：" + RB2.getText().toString());
}
}
});
}
}
第三步：修改res/layout/main.xml，其代码如下：
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"
>
<TextView
android:id="@+id/TV"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<RadioGroup
android:id="@+id/RG"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<RadioButton
android:id="@+id/rb1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/rbText1"
/>
<RadioButton
android:id="@+id/rb2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/rbText2"
/>
RadioGroup>
LinearLayout>
第四步：修改res/values/ strings.xml，其代码如下：
xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, RadioGroupDemo!string>
<string name="app_name">RadioGroupDemostring>
<string name="rbText1">天使知识授理厂string>
<string name="rbText2">www.a3gs.comstring>
resources>