4.5消费者采购列表---多选项CheckBox的应用

来源：互联网发布：淘宝购物车的东西少了编辑：程序博客网时间：2024/06/06 01:30

package irdc.EX04_05;import android.app.Activity; import android.os.Bundle; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.TextView; public class EX04_05 extends Activity {   /*声明对象变量*/   private TextView mTextView1;  private CheckBox mCheckBox1;   private CheckBox mCheckBox2;  private CheckBox mCheckBox3;    /** Called when the activity is first created. */  @Override   public void onCreate(Bundle savedInstanceState)  {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);             /*透过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: ");    /*透过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);    /*设定OnCheckedChangeListener给三个CheckBox对象*/    mCheckBox1.setOnCheckedChangeListener(mCheckBoxChanged);     mCheckBox2.setOnCheckedChangeListener(mCheckBoxChanged);     mCheckBox3.setOnCheckedChangeListener(mCheckBoxChanged);    }  /*声明并建构onCheckedChangeListener对象*/   private CheckBox.OnCheckedChangeListener mCheckBoxChanged =     new CheckBox.OnCheckedChangeListener()   {     /*implement onCheckedChanged方法*/    @Override     public void onCheckedChanged(         CompoundButton buttonView, boolean isChecked) {      // TODO Auto-generated method stub       /*透过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="但是超过预算啰!!";       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 * 三个对象总共八种情境*/      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);                   }      }      };}

<?xml version="1.0" encoding="utf-8"?><LinearLayout  android:id="@+id/widget28"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:orientation="vertical"  xmlns:android="http://schemas.android.com/apk/res/android"><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"></TextView></LinearLayout>

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