Android 中如何处理checkbox的选中、未选中

xml页面布局

<?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">
<CheckBox android:id="@+id/plain_cb"  
	android:text="Plain"  
	android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
<CheckBox android:id="@+id/bold_cb" 
	android:text="Bold"  
    android:layout_width="wrap_content"   
	android:layout_height="wrap_content"  
	android:textStyle="bold"  />   
<CheckBox android:id="@+id/serif_cb"  
	android:text="Serif"
    android:layout_width="wrap_content"    
	android:layout_height="wrap_content"  
	android:typeface="serif"  />   
<CheckBox android:id="@+id/italic_cb"  
	android:text="Italic"
    android:layout_width="wrap_content"    
	android:layout_height="wrap_content"  
	android:textStyle="italic" />
<Button android:id="@+id/get_view_button"  
	android:layout_width="wrap_content" 
	android:layout_height="wrap_content"  
	android:text="获取CheckBox的值" />
</LinearLayout>

java类:

package com.zgct.activity; 

public class CheckBoxActivity extends Activity {
  CheckBox plain_cb, serif_cb, italic_cb, bold_cb;
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setTitle("CheckBoxActivity");
   setContentView(R.layout.check_box);
   find_and_modify_text_view();
  }
  
  private void find_and_modify_text_view(){
   plain_cb = (CheckBox) findViewById(R.id.plain_cb);
   serif_cb = (CheckBox) findViewById(R.id.serif_cb);
   italic_cb = (CheckBox) findViewById(R.id.italic_cb);
   bold_cb = (CheckBox) findViewById(R.id.bold_cb);
   Button get_view_button = (Button)findViewById(R.id.get_view_button);
   get_view_button.setOnClickListener(get_view_button_listener);
 }
 
  private Button.OnClickListener get_view_button_listener = new Button.OnClickListener(){
     public void onClick(View v){
      String r = "";
      if(plain_cb.isChecked())   r = r + "," + plain_cb.getText();
      if(serif_cb.isChecked())    r = r + "," + serif_cb.getText();
      if(bold_cb.isChecked())    r = r + "," + bold_cb.getText();
      if(italic_cb.isChecked())   r = r + "," + italic_cb.getText();
	  setTitle("Checked: " + r);
     }  
	}; 
}

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Android 中如何处理checkbox的选中、未选中

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