4.5 CheckBox施用

4.5 CheckBox应用

package com.chaowen;import android.app.Activity;import android.os.Bundle;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.TextView;public class Ex04_05_checkBox2 extends Activity {    /** Called when the activity is first created. */private TextView mTextView1;private CheckBox mCheckBox1;private CheckBox mCheckBox2;private CheckBox mCheckBox3;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                //通过findViewById取得TextView对象并调整文字内容        mTextView1=(TextView)findViewById(R.id.myTextView1);        mTextView1.setText("你所选择的项目有:");                //通过findViewById取得三个CheckBox对象        mCheckBox1=(CheckBox)findViewById(R.id.myCheckBox1);        mCheckBox2=(CheckBox)findViewById(R.id.myCheckBox2);        mCheckBox3=(CheckBox)findViewById(R.id.myCheckBox3);                               //声明并构造onCheckedChangeListener对象        CheckBox.OnCheckedChangeListener mcheckBoxChanged=new CheckBox.OnCheckedChangeListener(){        @Override        public void onCheckedChanged(CompoundButton buttonView,        boolean isChecked) {        //通过getString()取得CheckBox的文字字符串        String str0="所选的项目为: ";        String str1=getString(R.string.str_checkbox1);        String str2=getString(R.string.str_checkbox2);        String str3=getString(R.string.str_checkbox3);        String plus=";";        String result="但是超过预算咯!!";        String result2="还可以再多买几本喔!!";                //任一CheckBox被勾选后，该CheckBox的文字会改变TextView的文字内容        if(mCheckBox1.isChecked()==true & mCheckBox2.isChecked()==true                      & mCheckBox3.isChecked()==true)                   {                     mTextView1.setText(str0+str1+plus+str2+plus+str3+result);                  }                   else if(mCheckBox1.isChecked()==false & mCheckBox2.isChecked()==true                      & mCheckBox3.isChecked()==true)                   {                     mTextView1.setText(str0+str2+plus+str3+result);                  }                   else if(mCheckBox1.isChecked()==true & mCheckBox2.isChecked()==false                      & mCheckBox3.isChecked()==true)                   {                     mTextView1.setText(str0+str1+plus+str3+result);                  }                   else if(mCheckBox1.isChecked()==true & mCheckBox2.isChecked()==true                      & mCheckBox3.isChecked()==false)                   {                     mTextView1.setText(str0+str1+plus+str2+result);                  }                   else if(mCheckBox1.isChecked()==false & mCheckBox2.isChecked()==false                      & mCheckBox3.isChecked()==true)                   {                     mTextView1.setText(str0+str3+plus+result2);                  }                   else if(mCheckBox1.isChecked()==false & mCheckBox2.isChecked()==true                      & mCheckBox3.isChecked()==false)                   {                     mTextView1.setText(str0+str2);                  }                   else if(mCheckBox1.isChecked()==true & mCheckBox2.isChecked()==false                      & mCheckBox3.isChecked()==false)                   {                     mTextView1.setText(str0+str1);                  }                   else if(mCheckBox1.isChecked()==false & mCheckBox2.isChecked()==false                      & mCheckBox3.isChecked()==false)                   {                     mTextView1.setText(str0);                  }         }        };                //设置OnCheckedChangeListener给三个Checkbox对象        mCheckBox1.setOnCheckedChangeListener(mcheckBoxChanged);        mCheckBox2.setOnCheckedChangeListener(mcheckBoxChanged);        mCheckBox3.setOnCheckedChangeListener(mcheckBoxChanged);    }}

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main.xml

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<?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/myTitle"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="@string/str_title"></TextView><CheckBox  android:id="@+id/myCheckBox1"  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:text="@string/str_checkbox1"></CheckBox><CheckBox  android:id="@+id/myCheckBox2"  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:text="@string/str_checkbox2"></CheckBox><CheckBoxandroid:id="@+id/myCheckBox3"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/str_checkbox3"></CheckBox><TextViewandroid:id="@+id/myTextView1"android:layout_width="wrap_content"android:layout_height="wrap_content"/></LinearLayout>

?Strings.xml

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<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Hello World, Ex04_05_checkBox2!</string>    <string name="app_name">Ex04_05_checkBox2</string>    <string name="str_title">我的消費券採購單</string>  <string name="str_checkbox1">泰國機票一張</string>  <string name="str_checkbox2">iPhone一台</string>  <string name="str_checkbox3">Android整合應用範例集一本</string></resources>