andriod RadioButton

<?xml version="1.0" encoding="UTF-8"?>

    <LinearLayout android:orientation="vertical" android:layout_height="fill_parent" android:layout_width="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">

    <TextView android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="多选控件：" android:id="@+id/label"/>
    <RadioGroup android:orientation="horizontal" android:layout_height="fill_parent" android:layout_width="fill_parent" android:id="@+id/radionGroup">
    <RadioButton android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="女" android:id="@+id/radioFemale"/>
    <RadioButton android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="男" android:id="@+id/radioMale" android:checked="true"/>
    <Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="确定" android:id="@+id/ok"/>
</RadioGroup>

</LinearLayout>

package com.example.yanlei.mytk;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;

public class MainActivity extends AppCompatActivity  {

    private RadioButton radioFemale;
    private RadioButton radioMale;
    private Button ok;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        radioFemale=(RadioButton)findViewById(R.id.radioFemale);
        radioMale=(RadioButton)findViewById(R.id.radioMale);
        ok=(Button)findViewById(R.id.ok);

        ok.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String result = "你选择的是：";
                if (radioFemale.isChecked()) {
                    setTitle(result + "女");
                } else {
                    setTitle(result + "男");
                }
            }
        });
    }
}