<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical" ><TextViewandroid:id="@+id/text"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="单选按钮" /><RadioGroup android:id="@+id/sex"android:layout_width="wrap_content"android:layout_height="wrap_content"><RadioButtonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text= "男"></RadioButton><RadioButtonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text= "女"></RadioButton>
</RadioGroup>
<Buttonandroid:id="@+id/select"android:text="选择"android:layout_width="fill_parent"android:layout_height="wrap_content"android:topLeftRadius="5dip"  android:topRightRadius="5dip"  android:bottomLeftRadius="5dip"  android:bottomRightRadius="5dip"></Button></LinearLayout>

package cn.szy.com;import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;public class MainActivity extends Activity {/** Called when the activity is first created. */private RadioGroup group;private Button button;private TextView textView;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);group = (RadioGroup) this.findViewById(R.id.sex);button  =(Button) this.findViewById(R.id.select);textView = (TextView) this.findViewById(R.id.text);button.setOnClickListener(new View.OnClickListener() {public void onClick(View v) {// Perform action on clickint len = group.getChildCount();String msg = "您选择了";textView.setText(msg);//             for(int i=0;i<len;i++){
//                  RadioButton radiobutton  = (RadioButton) group.getChildAt(i);
//                  if(radiobutton.isChecked()){
//                      msg = radiobutton.getText().toString();
//                      break;
//                  }
//              }RadioButton radiobutton1  = (RadioButton) group.getChildAt(0);RadioButton radiobutton2  = (RadioButton) group.getChildAt(1);if(radiobutton1.isChecked()){Toast.makeText(MainActivity.this, "男", 1).show();}else if(radiobutton2.isChecked()){Toast.makeText(MainActivity.this, "女", 1).show();}}});}
}