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?2008SunMicrosystems,Inc.Allrightsreserved.
3. *Useissubjecttolicenseterms.
4. *
5. */
6. packagecom.sun.lwuit.uidemo;
8. importcom.sun.lwuit.ButtonGroup;
9. importcom.sun.lwuit.CheckBox;
10. importcom.sun.lwuit.Command;
11. importcom.sun.lwuit.Component;
12. importcom.sun.lwuit.Dialog;
13. importcom.sun.lwuit.Form;
14. importcom.sun.lwuit.Label;
15. importcom.sun.lwuit.RadioButton;
16. importcom.sun.lwuit.layouts.BoxLayout;
17. importcom.sun.lwuit.events.ActionEvent;
18. importcom.sun.lwuit.events.ActionListener;
20. /**
21. *演示RadioButton、CheckBox、Label的使用
22. */
23. publicclassRb_Cb_LbimplementsActionListener{
24. publicFormform=newForm("Rb_Cb_Lb");
25. publicCommandbackCommand=newCommand("Back",1);//返回按钮
26. publicCommandselectCommand=newCommand("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. publicButtonGroupgroup=newButtonGroup();
29. Rb_Cb_Lb(){
30. form.setLayout(newBoxLayout(BoxLayout.Y_AXIS));
31. form.addCommand(backCommand);
32. form.addCommand(selectCommand);
33. form.setCommandListener(this);
35. Labelcdlabel=newLabel("CheckBox:");
36. cdlabel.getStyle().setMargin(Component.BOTTOM,0);
37. form.addComponent(cdlabel);
39. finalCheckBoxfirstCB=newCheckBox("FirstCheckBox");
40. firstCB.getStyle().setMargin(Component.TOP,1);
41. form.addComponent(firstCB);
43. finalCheckBoxsecondCB=newCheckBox("SecondCheckBox");
44. secondCB.getStyle().setMargin(0,5,2,2);
45. form.addComponent(secondCB);
47. Labelrblabel=newLabel("RadioButton:");
48. rblabel.getStyle().setMargin(Component.BOTTOM,0);
49. form.addComponent(rblabel);
51. finalRadioButtonfirstRB=newRadioButton("FirstRadioButton");
52. form.addComponent(firstRB);
54. finalRadioButtonsecondRB=newRadioButton("SecondRadioButton");
55. form.addComponent(secondRB);
57. finalRadioButtonthirdRB=newRadioButton("ThirdRadioButton");
58. form.addComponent(thirdRB);
60. ActionListenerlistener=newActionListener(){
61. //这里是处理CheckBox、RadioButton点击事件处理程序
62. publicvoidactionPerformed(ActionEventarg0){
63. Objectsource=arg0.getSource();
64. if(source==firstCB)
65. Dialog.show("Rb_Cb_Lb","firstCB","OK",null);
66. elseif(source==secondCB)
67. Dialog.show("Rb_Cb_Lb","secondCB","OK",null);
68. elseif(source==firstRB)
69. Dialog.show("Rb_Cb_Lb","firstRB","OK",null);
70. elseif(source==secondRB)
71. Dialog.show("Rb_Cb_Lb","secondRB","OK",null);
72. elseif(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. publicvoidactionPerformed(ActionEventarg0){
91. //这里处理Command以及判断ButtonGroup所选中的RadioButton
92. Commandcmd=arg0.getCommand();
93. if(cmd==backCommand)
94. UIDemoMIDlet.backToMainMenu();
95. elseif(cmd==selectCommand)
96. {
97. Stringstr="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. }