android学习--radiogroup学习

<?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="wrap_content"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/sex" />

    <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="@string/boy" />

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/girl" />
    </RadioGroup>

    <Button
        android:id="@+id/btn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/btnSel" />

</LinearLayout>

package com.skycc.radio;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
/**
 * 

 * @Description: 单选按钮练习

 * @author:skycc

 * @time:2014-4-10 下午3:53:15
 */
public class MainActivity extends Activity {
    private Button button;
    private RadioGroup group;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_layout);
        button = (Button) this.findViewById(R.id.btn);
        group = (RadioGroup) this.findViewById(R.id.sex);
        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                int len = group.getChildCount();//获取这个group中的radio数
                String msgString = "";
                for (int i = 0; i < len; i++) {
                    RadioButton radioButton = (RadioButton) group.getChildAt(i);//将每个group中的radio进行遍历，并判断是否被选中
                    if (radioButton.isChecked()) {

                        msgString = "选中了性别" + radioButton.getText().toString();
                        break;
                    }
                }
                Toast.makeText(MainActivity.this, msgString, 1).show();
            }
        });
    }
}