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); }}?
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">我的消券</string> <string name="str_checkbox1">泰票一</string> <string name="str_checkbox2">iPhone一台</string> <string name="str_checkbox3">Android整合用例集一本</string></resources>?