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