Android基础教程(6)之-多选项CheckBox

Android基础教程(六)之----多选项CheckBox

首先我们看一下效果图:

string.xml:<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Hello World, CheckboxDemo!</string>    <string name="app_name">CheckboxDemo</string>    <string name="hobby">你的爱好是:</string>    <string name="basketball">篮球</string>    <string name="football">足球</string></resources>主程序界面代码main.xml<?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/hobby"    /><CheckBox    android:id="@+id/checkbox1"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="@string/basketball"/><CheckBox    android:id="@+id/checkbox2"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="@string/football"/></LinearLayout>最后是程序的核心代码CheckBoxDemo:package com.android.test;import android.app.Activity;import android.os.Bundle;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.TextView;public class CheckboxDemo extends Activity {      private TextView tv;    private CheckBox cb1;    private CheckBox cb2;    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);               tv = (TextView)findViewById(R.id.textview1);        cb1 = (CheckBox)findViewById(R.id.checkbox1);        cb2 = (CheckBox)findViewById(R.id.checkbox2);               cb1.setOnCheckedChangeListener(cbListener);        cb2.setOnCheckedChangeListener(cbListener);                  }       private CheckBox.OnCheckedChangeListener cbListener =        new CheckBox.OnCheckedChangeListener(){               public void onCheckedChanged(CompoundButton buttonView,boolean isChecked)        {            String stv = getString(R.string.hobby);            String scb1 = getString(R.string.basketball);            String scb2 = getString(R.string.football);            //判断一共有四种情况            if(cb1.isChecked()== true && cb2.isChecked()== true)            {                tv.setText(stv + scb1 + "," + scb2);            }            else if(cb1.isChecked()== true && cb2.isChecked()== false)            {                tv.setText(stv+scb1);            }            else if(cb1.isChecked() == false && cb2.isChecked() == true)            {                tv.setText(stv+scb2);            }            else{                tv.setText(stv);            }        }    };   }

? 1 楼 windloverain 2010-12-04   //判断一共有四种情况  
这样判断有点复杂了，其实只要判断每个是否check就行，如果check了就追加要显示的字符串给String对象或StringBuffer对象。
最后在把String对象设置TextView的值就ok了。