ANDROID笔记：利用XML布局文件生成Menu

 1 package com.example.android_menu;
 2 
 3 import android.app.Activity;
 4 import android.graphics.Color;
 5 import android.os.Bundle;
 6 import android.view.Menu;
 7 import android.view.MenuInflater;
 8 import android.view.MenuItem;
 9 import android.widget.TextView;
10 
11 public class MyMenuActivity extends Activity {
12     TextView textView;
13 
14     @Override
15     protected void onCreate(Bundle savedInstanceState) {
16         super.onCreate(savedInstanceState);
17         setContentView(R.layout.contextmenuactivity);
18         textView = (TextView) findViewById(R.id.itemtext);
19     }
20 
21     /**
22      * 点击菜单按键时调用的函数
23      */
24     @Override
25     public boolean onCreateOptionsMenu(Menu menu) {
26         // 菜单加载器
27         MenuInflater menuInflater = new MenuInflater(getApplicationContext());
28         menuInflater.inflate(R.menu.mymenu, menu);
29         return super.onCreateOptionsMenu(menu);
30     }
31 
32     /**
33      * 响应菜单动作的回调函数
34      */
35     @Override
36     public boolean onOptionsItemSelected(MenuItem item) {
37         //得到Id
38         switch (item.getItemId()) {
39         case R.id.font10sp:
40             textView.setTextSize(10);
41             break;
42         case R.id.font20sp:
43             textView.setTextSize(20);
44             break;
45         case R.id.font30sp:
46             textView.setTextSize(30);
47             break;
48         case R.id.fontblue:
49             textView.setTextColor(Color.BLUE);
50             break;
51         case R.id.fontgreen:
52             textView.setTextColor(Color.GREEN);
53             break;
54         case R.id.fontred:
55             textView.setTextColor(Color.RED);
56             break;
57         }
58         return super.onOptionsItemSelected(item);
59     }
60 }

res/menu/mymenu.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <menu xmlns:android="http://schemas.android.com/apk/res/android" >
 3 
 4     <item
 5         android:id="@+id/fontsize"
 6         android:title="设置字体大小">
 7         <menu>
 8  <!-- 单选 -->
 9             <group android:checkableBehavior="single" >
10                 <item
11                     android:id="@+id/font10sp"
12                     android:title="10sp">
13                 </item>
14                 <item
15                     android:id="@+id/font20sp"
16                     android:title="20sp">
17                 </item>
18                 <item
19                     android:id="@+id/font30sp"
20                     android:title="30sp">
21                 </item>
22             </group>
23         </menu>
24     </item>
25     <item
26         android:id="@+id/selectnull"
27         android:title="空白菜单"/>
28     <item
29         android:id="@+id/fontcolor"
30         android:title="设置字体颜色">
31         <menu>
32  <!-- 多选 -->
33             <group android:checkableBehavior="all" >
34                 <item
35                     android:id="@+id/fontred"
36                     android:title="红色">
37                 </item>
38                 <item
39                     android:id="@+id/fontgreen"
40                     android:title="绿色">
41                 </item>
42                 <item
43                     android:id="@+id/fontblue"
44                     android:title="蓝色">
45                 </item>
46             </group>
47         </menu>
48     </item>
49 
50 </menu>

点击Menu按键就会在屏幕底部弹出Menu