Android-CheckBox多项选择Demo

package com.lxt008;

import com.lxt008.R;

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.Toast;

public class Activity01 extends Activity
{
    //用来显示题目
    TextView    m_TextView1;
    //“提交按钮”
    Button        m_Button1;
    //4个多选项
    CheckBox    m_CheckBox1;
    CheckBox    m_CheckBox2;
    CheckBox    m_CheckBox3;
    CheckBox    m_CheckBox4;
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        m_TextView1 = (TextView) findViewById(R.id.TextView1);
        m_Button1 = (Button) findViewById(R.id.button1);

        /* 取得每个CheckBox对象 */
        m_CheckBox1 = (CheckBox) findViewById(R.id.CheckBox1);
        m_CheckBox2 = (CheckBox) findViewById(R.id.CheckBox2);
        m_CheckBox3 = (CheckBox) findViewById(R.id.CheckBox3);
        m_CheckBox4 = (CheckBox) findViewById(R.id.CheckBox4);

        //对每个选项设置事件监听
        m_CheckBox1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
            {
                if(m_CheckBox1.isChecked())
                {
                    DisplayToast("你选择了："+m_CheckBox1.getText());
                }
            }
        });
        ////////////////////
        m_CheckBox2.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() {
            
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
            {
                if(m_CheckBox2.isChecked())
                {
                    DisplayToast("你选择了："+m_CheckBox2.getText());
                }
            }
        });
        /////////////////
        m_CheckBox3.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() {
            
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
            {
                if(m_CheckBox3.isChecked())
                {
                    DisplayToast("你选择了："+m_CheckBox3.getText());
                }
            }
        });
        ////////////////
        m_CheckBox4.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() {
            
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
            {
                if(m_CheckBox4.isChecked())
                {
                    DisplayToast("你选择了："+m_CheckBox4.getText());
                }
            }
        });
        //对按钮设置事件监听
        m_Button1.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v)
            {
                int num = 0;
                if(m_CheckBox1.isChecked())
                {
                    num++;
                }
                if(m_CheckBox2.isChecked())
                {
                    num++;
                }
                if(m_CheckBox3.isChecked())
                {
                    num++;
                }
                if(m_CheckBox4.isChecked())
                {
                    num++;
                }
                DisplayToast("谢谢参与！你一共选择了"+num+"项！");
            }
        });
    }
    
    /* 显示Toast  */
    public void DisplayToast(String str)
    {
        Toast toast = Toast.makeText(this, str, Toast.LENGTH_SHORT);
        //设置toast显示的位置
        toast.setGravity(Gravity.TOP, 0, 220);
        //显示该Toast
        toast.show();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
      android:id="@+id/TextView1"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<CheckBox
  android:id="@+id/CheckBox1"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/CheckBox1"
>
</CheckBox>
<CheckBox
  android:id="@+id/CheckBox2"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/CheckBox2"
>
</CheckBox>
<CheckBox
android:id="@+id/CheckBox3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/CheckBox3"
>
</CheckBox>
<CheckBox
android:id="@+id/CheckBox4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/CheckBox4"
>
</CheckBox>
    <Button
      android:id="@+id/button1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="提交"
    >
    </Button>
</LinearLayout>