Java-Android 之单选按钮的运用

<?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" >
    <TextView
        android: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"
    >
    <RadioButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text= "男"
        ></RadioButton>
   <RadioButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text= "女"
        ></RadioButton>
</RadioGroup>
<Button
    android: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;
    @Override
    public 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 click
            	int 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();
            	}
            	
            }
        });

    }
}