Android 中如何处理checkbox的选中、未选中

xml页面布局

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);
     }  
	}; 
}