라디오 버튼(RadioButton) 및 확인란(CheckBox)의 기능 및 사용 방법

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TableRow>
        <TextView android:text="  ："
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="16px"/>

        <RadioGroup android:id="@+id/rg"
            android:orientation="horizontal"
            android:layout_gravity="center_horizontal">

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/male"
                android:text=" "
                android:checked="true"/>
            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/female"
                android:text=" "/>
        RadioGroup>
    TableRow>

    <TableRow>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="     "
            android:textSize="16px"/>

        <LinearLayout
            android:layout_gravity="center_horizontal"
            android:orientation="vertical"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">

            <CheckBox
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="  "
                android:checked="true"/>

            <CheckBox
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="  "
                />

            <CheckBox
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="  "
                />
        LinearLayout>

    TableRow>
    <TextView
        android:id="@+id/show"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

TableLayout>

package com.example.yangjian.checkbuttontest;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.RadioGroup;
import android.widget.TextView;


public class MainActivity extends ActionBarActivity {

    RadioGroup rg;
    TextView show;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        rg = (RadioGroup) findViewById(R.id.rg);
        show = (TextView) findViewById(R.id.show);
        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                String tip = checkedId == R.id.male ? "       ":"       ";
                show.setText(tip);
            }
        });
    }

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}