android CheckBox控件的定义及事件监听

CheckBox控件的定义,main.xml内容如下：

activity CheckBoxTest.java内容如下：

    package checkbox.pack; 
     
    import android.app.Activity; 
    import android.os.Bundle; 
    import android.widget.CheckBox; 
    import android.widget.CompoundButton; 
    import android.widget.EditText; 
     
    public class CheckBoxTest extends Activity { 
         
        //对控件对象进行声明 
        CheckBox beijing=null; 
        CheckBox shanghai=null; 
        CheckBox shenzhen=null; 
        EditText editText1=null; 
        @Override 
        public void onCreate(Bundle savedInstanceState) { 
            super.onCreate(savedInstanceState); 
            setContentView(R.layout.main); 
            //通过控件的ID来得到代表控件的对象 
            beijing=(CheckBox)findViewById(R.id.beijing); 
            shanghai=(CheckBox)findViewById(R.id.shanghai); 
            shenzhen=(CheckBox)findViewById(R.id.shenzhen); 
            editText1=(EditText)findViewById(R.id.editText1); 
            //给CheckBox设置事件监听 
            beijing.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){ 
                @Override 
                public void onCheckedChanged(CompoundButton buttonView, 
                        boolean isChecked) { 
                    // TODO Auto-generated method stub 
                    if(isChecked){ 
                        editText1.setText(buttonView.getText()+"选中"); 
                    }else{ 
                        editText1.setText(buttonView.getText()+"取消选中"); 
                    } 
                } 
            }); 
            shanghai.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){ 
                @Override 
                public void onCheckedChanged(CompoundButton buttonView, 
                        boolean isChecked) { 
                    // TODO Auto-generated method stub 
                    if(isChecked){ 
                        editText1.setText(buttonView.getText()+"选中"); 
                    }else{ 
                        editText1.setText(buttonView.getText()+"取消选中"); 
                    } 
                } 
            }); 
            shenzhen.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){ 
                @Override 
                public void onCheckedChanged(CompoundButton buttonView, 
                        boolean isChecked) { 
                    // TODO Auto-generated method stub 
                    if(isChecked){ 
                        editText1.setText(buttonView.getText()+"选中"); 
                    }else{ 
                        editText1.setText(buttonView.getText()+"取消选中"); 
                    } 
                } 
            }); 
        } 
    } 

android怎么把checkbox状态设置为选中状态

android:checked="true"

通过checkbox.isChecked();是判断后是否选中，

checkbox.setChecked(true|false)是赋某个checkbox选中。