Android选项菜单用法实例分析
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：
<?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：
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。