本文实例讲述了Android RadioGroup和RadioButton控件简单用法。分享给大家供大家参考，具体如下：
RadioGroup和RadioButton代表的是Android中单选按钮的一种控件，写个简单的代码熟悉一下：
import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;
public class Radio extends Activity {
private TextView myTextView;
private RadioButton chinaBtn;
private RadioButton ukBtn;
private RadioButton usaBtn;
private RadioGroup rg;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//通过ID找到TextView
myTextView = (TextView) findViewById(R.id.myTextView);
//通过ID找到RadioButton
chinaBtn = (RadioButton) findViewById(R.id.china_Button);
ukBtn = (RadioButton) findViewById(R.id.uk_Button);
usaBtn = (RadioButton) findViewById(R.id.usa_Button);
//通过ID找到RadioGroup
rg = (RadioGroup) findViewById(R.id.rBtnGroup);
//只要对RadioGroup进行监听
rg.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
if(R.id.china_Button == checkedId){
myTextView.setText("您选择的国家是：" + chinaBtn.getText().toString());
}
else if(R.id.uk_Button == checkedId){
myTextView.setText("您选择的国家是：" + ukBtn.getText().toString());
}
else if(R.id.usa_Button == checkedId){
myTextView.setText("您选择的国家是：" + usaBtn.getText().toString());
}
}
});
}
}
main.xml文件如下：
<?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/myTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<RadioGroup android:id="@+id/rBtnGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
<RadioButton
android:id="@+id/china_Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="中国"
/>
<RadioButton
android:id="@+id/uk_Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="英国"
/>
<RadioButton
android:id="@+id/usa_Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="美国"
/>
</RadioGroup>
</LinearLayout>
效果如下：
希望本文所述对大家Android程序设计有所帮助。
