RadioButton选项按钮控件

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="性别：" />
    <RadioGroup
        android:id="@+id/sex"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
         >
        <RadioButton 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="男"
            />
        <RadioButton 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="女"
            />
        
    </RadioGroup>
    <Button 
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="选择性别"
        />
</LinearLayout>

package com.example.android_radiobt;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends Activity {
    
    private RadioGroup group;
    private Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        group = (RadioGroup)this.findViewById(R.id.sex);
        button = (Button)this.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View arg0) {
                int len = group.getChildCount();//获得单选按钮组的选项个数
                String msgsString = "";
                for(int i=0;i<len;i++){
                    RadioButton radioButton = (RadioButton)group.getChildAt(i);
                    if(radioButton.isChecked()){
                        msgsString = radioButton.getText().toString();
                        break;
                    }
                }
                Toast.makeText(MainActivity.this, msgsString, 1).show();
            }
        });
        
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}