Android入门--多选项CheckBox 及CheckBox选择事件 的应用

① 新建工程

② 在string.xml 中添加字符串

<pre name="code" class="html"><pre name="code" class="html"><?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Forward</string>    
    <string name="shoopingList_TextView_text" >网上购物商品清单</string>
    <string name="yourChocieWoods_text" >您选择购买的商品：</string>
    <string name="woods_Text_MP4">纽曼MP4</string>
    <string name="woods_Text_musicCD">Beyond乐队CD</string>
    <string name="woods_Text_book">Android程序员指南</string>

</resources>

activity_forward.xml文件代码如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.hanji.forward.Forward" >

    <TextView
        android:id="@+id/TextView_shoppingList"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/shoopingList_TextView_text"
        android:textSize="25px" >
    </TextView>

    <CheckBox
        android:id="@+id/CheckBox_MP4"
        android:layout_width="180px"
        android:layout_height="wrap_content"
        android:text="@string/woods_Text_MP4"
        android:layout_below="@+id/TextView_shoppingList"
    	android:layout_marginTop="20dp" >
    </CheckBox>

    <CheckBox
        android:id="@+id/CheckBox_musicCD"
        android:layout_width="180px"
        android:layout_height="wrap_content"
        android:text="@string/woods_Text_musicCD"
		android:layout_below="@+id/CheckBox_MP4"
    	android:layout_marginTop="20dp" >
    </CheckBox>

    <CheckBox
        android:id="@+id/CheckBox_book"
        android:layout_width="180px"
        android:layout_height="wrap_content"
        android:text="@string/woods_Text_book"
        android:layout_below="@+id/CheckBox_musicCD"
    	android:layout_marginTop="20dp" >
    </CheckBox>

    <TextView
        android:id="@+id/TextView_yourChoice"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/yourChocieWoods_text"
        android:textSize="20px" 
        android:layout_below="@+id/CheckBox_book"
    	android:layout_marginTop="20dp" >
    </TextView>

    <TextView
        android:id="@+id/TextView_yourWoodsList"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="20px" 
        android:layout_below="@+id/TextView_yourChoice"
    	android:layout_marginTop="20dp" >
    </TextView>

</RelativeLayout>

Forward.java文件代码如下：

package com.hanji.forward;

import android.support.v7.app.ActionBarActivity;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;

public class Forward extends ActionBarActivity {

	private TextView showyourChoice_TextView;
	private CheckBox mp4_CheckBox, musicCD_CheckBox, book_CheckBox;
	private String showinfo;

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

		/* findViewById()从XML中获取资源对象 */
		showyourChoice_TextView = (TextView) findViewById(R.id.TextView_yourWoodsList);
		mp4_CheckBox = (CheckBox) findViewById(R.id.CheckBox_MP4);
		musicCD_CheckBox = (CheckBox) findViewById(R.id.CheckBox_musicCD);
		book_CheckBox = (CheckBox) findViewById(R.id.CheckBox_book);
		/* 为三个CheckBox设置选择状态改变事件监听器 */
		mp4_CheckBox.setOnCheckedChangeListener(CheckedChangeListener);
		musicCD_CheckBox.setOnCheckedChangeListener(CheckedChangeListener);
		book_CheckBox.setOnCheckedChangeListener(CheckedChangeListener);
		/* 从XML中获取显示信息String */
		showinfo = getString(R.string.yourChocieWoods_text);
	}

	/* 内部接口实现 */
	private OnCheckedChangeListener CheckedChangeListener = new OnCheckedChangeListener() {
		@Override
		public void onCheckedChanged(CompoundButton buttonView,
				boolean isChecked) {
			// TODO Auto-generated method stub
			/* 处理选中状态改变事件，动态显示选择结果 */
			if (mp4_CheckBox.isChecked()) {
				showinfo = getString(R.string.woods_Text_MP4) + "\n";
				showString();
			} else if (musicCD_CheckBox.isChecked()) {
				showinfo = getString(R.string.woods_Text_musicCD) + "\n";
				showString();
			} else if (book_CheckBox.isChecked()) {
				showinfo = getString(R.string.woods_Text_book) + "\n";
				showString();
			}
			if (mp4_CheckBox.isChecked() && musicCD_CheckBox.isChecked()) {
				showinfo = getString(R.string.woods_Text_MP4) + "\n"
						+ getString(R.string.woods_Text_musicCD) + "\n";
				showString();
			} else if (mp4_CheckBox.isChecked() && book_CheckBox.isChecked()) {
				showinfo = getString(R.string.woods_Text_MP4) + "\n"
						+ getString(R.string.woods_Text_book) + "\n";
				showString();
			} else if (musicCD_CheckBox.isChecked()
					&& book_CheckBox.isChecked()) {
				showinfo = getString(R.string.woods_Text_musicCD) + "\n"
						+ getString(R.string.woods_Text_book) + "\n";
				showString();
			}
			if (mp4_CheckBox.isChecked() && musicCD_CheckBox.isChecked()
					&& book_CheckBox.isChecked()) {
				showinfo = getString(R.string.woods_Text_MP4) + "\n"
						+ getString(R.string.woods_Text_musicCD) + "\n"
						+ getString(R.string.woods_Text_book) + "\n";
				showString();
			}
			if (mp4_CheckBox.isChecked() == false
					&& musicCD_CheckBox.isChecked() == false
					&& book_CheckBox.isChecked() == false) {
				showyourChoice_TextView.setText("");
			}
		}

		public void showString() {
			showyourChoice_TextView.setText(showinfo);
		}
	};
}