J2ME GUI实战之六 ----------LWUIT的Label、CheckBox、RadioButton

 本文来自：http://blog.youkuaiyun.com/hellogv/ ，转载必须注明出处！

    文章写到这里，想必大家也对LWUIT有个大概的了解了，至少也该知道LWUIT可以做些什么。九宫图只是LWUIT的Button控件的典型应用而已，在LWUIT里面，还有很多在J2SE GUI可以见到的控件，例如文本需要介绍的Label、CheckBox、RadioButton等。
    Label一般用于显示而已，CheckBox作为复选框，可以让你多选，RadioButton作为单选框，仅仅让你多选一。
    OK，废话少水，直奔代码：

1. /*
2.  * Copyright ?2008 Sun Microsystems, Inc. All rights reserved.
3.  * Use is subject to license terms.
4.  *
5.  */
6. package com.sun.lwuit.uidemo;
8. import com.sun.lwuit.ButtonGroup;
9. import com.sun.lwuit.CheckBox;
10. import com.sun.lwuit.Command;
11. import com.sun.lwuit.Component;
12. import com.sun.lwuit.Dialog;
13. import com.sun.lwuit.Form;
14. import com.sun.lwuit.Label;
15. import com.sun.lwuit.RadioButton;
16. import com.sun.lwuit.layouts.BoxLayout;
17. import com.sun.lwuit.events.ActionEvent;
18. import com.sun.lwuit.events.ActionListener;
20. /**
21.  * 演示RadioButton、CheckBox、Label的使用
22.  */
23. public class Rb_Cb_Lb implements ActionListener {
24. public Form form = new Form("Rb_Cb_Lb");
25. public  Command backCommand = new Command("Back", 1);//返回按钮
26. public  Command selectCommand = new Command("select", 2);//确认选择的按钮
27. //ButtonGroup就是把所有的RadioButton放在一起，选择唯一
28. public ButtonGroup group = new ButtonGroup();
29.     Rb_Cb_Lb(){
30.         form.setLayout(new BoxLayout(BoxLayout.Y_AXIS));
31.         form.addCommand(backCommand);
32.         form.addCommand(selectCommand);
33.         form.setCommandListener(this);
35.         Label cdlabel = new Label("CheckBox:");
36.         cdlabel.getStyle().setMargin(Component.BOTTOM, 0);
37.         form.addComponent(cdlabel);
39.         final CheckBox firstCB = new CheckBox("First CheckBox");
40.         firstCB.getStyle().setMargin(Component.TOP, 1);
41.         form.addComponent(firstCB);
43.         final CheckBox secondCB = new CheckBox("Second CheckBox");
44.         secondCB.getStyle().setMargin(0, 5, 2, 2);
45.         form.addComponent(secondCB);
47.         Label rblabel = new Label("RadioButton:");
48.         rblabel.getStyle().setMargin(Component.BOTTOM, 0);
49.         form.addComponent(rblabel);
51.         final RadioButton firstRB = new RadioButton("First RadioButton");
52.         form.addComponent(firstRB);
53.         
54.         final RadioButton secondRB = new RadioButton("Second RadioButton");
55.         form.addComponent(secondRB);
57.         final RadioButton thirdRB = new RadioButton("Third RadioButton");
58.         form.addComponent(thirdRB);
60.         ActionListener listener = new ActionListener() {
61.         //这里是处理CheckBox、RadioButton 点击事件处理程序
62.             public void actionPerformed(ActionEvent arg0) {
63.                 Object source = arg0.getSource();
64.                 if(source==firstCB)
65.                     Dialog.show("Rb_Cb_Lb","firstCB", "OK", null);
66.                 else if(source==secondCB)
67.                     Dialog.show("Rb_Cb_Lb","secondCB", "OK", null);
68.                 else if(source==firstRB)
69.                     Dialog.show("Rb_Cb_Lb","firstRB", "OK", null);
70.                 else if(source==secondRB)
71.                     Dialog.show("Rb_Cb_Lb","secondRB", "OK", null);
72.                 else if(source==thirdRB)
73.                     Dialog.show("Rb_Cb_Lb","thirdRB", "OK", null);
74.             }
75.         };
77.         //往ButtonGroup加入radiobutton
78.         group.add(firstRB);
79.         group.add(secondRB);
80.         group.add(thirdRB);
81.         firstRB.addActionListener(listener);//加入事件监听
82.         secondRB.addActionListener(listener);//加入事件监听
83.         thirdRB.addActionListener(listener);//加入事件监听
85.         //----为复选框加入事件监听
86.         firstCB.addActionListener(listener);
87.         secondCB.addActionListener(listener);
88.     };
90.     public void actionPerformed(ActionEvent arg0) {
91.     //这里处理Command 以及 判断ButtonGroup所选中的RadioButton
92.         Command cmd=arg0.getCommand();
93.         if(cmd==backCommand)
94.             UIDemoMIDlet.backToMainMenu();
95.         else if(cmd==selectCommand)
96.         {
97.             String str="ButtonCount:"+group.getButtonCount()+'/n'+
98.                        "SelectedIndex:"+group.getSelectedIndex()+'/n'+
99.                        "RadioButton:"+(group.getRadioButton(group.getSelectedIndex()).getText());
100.             Dialog.show("Rb_Cb_Lb",str, "OK", null);
101.         }
102.     }
103. }