本文实例讲述了android选项菜单用法。分享给大家供大家参考。具体如下：
android平台下所提供的菜单大体上可分为三类：选项菜单、上下文菜单和子菜单。
当activity在前台运行时，如果用户按下手机上的menu键，此时就会在屏幕低端弹出相应的选项菜单。但这个功能需要开发人员编程来实现的，如果在开发应用程序时没有实现该功能，那么程序运行时按下手机的meun键是不会起作用的。
对于携带图标的选项菜单，每次最多只能显示6个，当菜单选项多于6个时，将只显示前5个和一个扩展菜单选项，点击扩展菜单选项将会弹出其余的菜单项。扩展菜单项中将不会显示图标，但是可以显示单选按钮和复选框。
以下模拟选项菜单
main.xml布局文件：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
|
<?xml version="1.0" encoding="utf-8"?><linearlayout android:id="@+id/linearlayout01" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android"> <scrollview android:id="@+id/scrollview" android:layout_width="fill_parent" android:layout_height="fill_parent"> <edittext android:id="@+id/edittext" android:layout_width="fill_parent" android:layout_height="fill_parent" android:editable="false" android:cursorvisible="false" android:text="您的选择为\n"> </edittext> </scrollview></linearlayout> |
meunactivity类：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
package com.ljq.activity;import android.app.activity;import android.os.bundle;import android.view.menu;import android.view.menuitem;import android.view.submenu;import android.view.menuitem.onmenuitemclicklistener;import android.widget.edittext;public class meunactivity extends activity { private final int menu_gender_male = 0; private final int menu_gender_female = 1; private final int menu_hobby1 = 2; private final int menu_hobby2 = 3; private final int menu_hobby3 = 4; private final int menu_ok = 5; private final int menu_gender = 6; private final int menu_hobby = 7; private final int gender_group = 0; private final int hobby_group = 1; private final int main_group = 2; menuitem[] hoddymenuitems = new menuitem[3];// 爱好菜单项组 menuitem malemenuitem = null;// 男性菜单项 @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); } /**j * 初始化选项菜单 */ @override public boolean oncreateoptionsmenu(menu menu) { //单选菜单选项 submenu gendermenu = menu.addsubmenu(main_group, menu_gender, 0, "性别"); gendermenu.seticon(r.drawable.gender); gendermenu.setheadericon(r.drawable.gender); malemenuitem = gendermenu.add(gender_group, menu_gender_male, 0, "男"); malemenuitem.setchecked(true); gendermenu.add(gender_group, menu_gender_female, 0, "女"); //设置菜单项为单选菜单项，互斥的 gendermenu.setgroupcheckable(gender_group, true, true); //复选菜单选项 submenu hobbymenu = menu.addsubmenu(main_group,menu_hobby,0,"爱好"); hobbymenu.seticon(r.drawable.hobby); hobbymenu.setheadericon(r.drawable.hobby); hoddymenuitems[0]=hobbymenu.add(hobby_group, menu_hobby1, 0, "游泳"); hoddymenuitems[1]=hobbymenu.add(hobby_group, menu_hobby2, 0, "唱歌"); hoddymenuitems[2]=hobbymenu.add(hobby_group, menu_hobby3, 0, "编程"); //设置菜单项为复选菜单项 hoddymenuitems[0].setcheckable(true); hoddymenuitems[1].setcheckable(true); hoddymenuitems[2].setcheckable(true); //确定菜单项 menuitem ok=menu.add(main_group,menu_ok,0,"确定"); ok.setonmenuitemclicklistener(new onmenuitemclicklistener(){ public boolean onmenuitemclick(menuitem item) { appendstatestr(); return true; } }); //给确定菜单项添加快捷键 ok.setalphabeticshortcut('o');//设置字符快捷键 //ok.setnumericshortcut('1');//设置数字快捷键 //ok.setshortcut('a', '2');//同时设置两种快捷键。注意：同时设置多次时只有最后一个设置起作用 return true; // 记得返回true，否则无效 } /** * 在菜单选项中某个选项被选中时调用该事件 */ @override public boolean onoptionsitemselected(menuitem item) { switch (item.getitemid()) { case menu_gender_male: case menu_gender_female: item.setchecked(true); appendstatestr(); break; case menu_hobby1: case menu_hobby2: case menu_hobby3: item.setchecked(!item.ischecked()); appendstatestr(); break; } return true; } public void appendstatestr() { string result = "您选择的性别为："; if (malemenuitem.ischecked()) { result = result + "男"; } else { result = result + "女"; } string hobbystr = ""; for (menuitem hoddy : hoddymenuitems) { if (hoddy.ischecked()) { hobbystr = hobbystr + hoddy.gettitle() + "、"; } } if (hobbystr.length() > 0) { result = result + ",您的爱好为：" + hobbystr.substring(0, hobbystr.length() - 1) + "。\n"; } else { result = result + "。\n"; } edittext et = (edittext) meunactivity.this.findviewbyid(r.id.edittext); et.append(result); }} |
运行结果：
希望本文所述对大家的android程序设计有所帮助。
