在屏幕中显示复选框

<?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="AA"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
/>
 
<CheckBox android:id="@+id/serif_cb"
     android:text="BB"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:typeface="serif"
/>
 
<CheckBox android:id="@+id/bold_cb"
     android:text="CC"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:textStyle="bold"
/>
 
<CheckBox android:id ="@+id/italic_cb"
     android:text="DD"
     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="获取复选框的值" />
    
</LinearLayout>

</pre><pre name="code" class="java">package m.usewidget;

import m.usewidget.R;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;

public class CheckBoxActivity extends Activity {
	CheckBox plain_cb;
	CheckBox serif_cb;
	CheckBox italic_cb;
	CheckBox bold_cb;

	/** Called when the activity is first created. */
	@Override
	public 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 (italic_cb.isChecked()) {
				r = r + "," + italic_cb.getText();
			}
			if (bold_cb.isChecked()) {
				r = r + "," + bold_cb.getText();
			}
			setTitle("Checked: " + r);
		}
	};
}