android menu

public boolean onCreateOptionsMenu(Menu menu)
    {
        // -------------向menu中添加子菜单-------------
        SubMenu p    = menu.addSubMenu("测试");
        SubMenu prog = menu.addSubMenu("启动程序");
        // 设置菜单头的图标
        p.setHeaderIcon(R.drawable.tools);
        p.setHeaderTitle("测试标题");
        MenuItem item1 = p.add("启动other");
        item1.setIntent(new Intent(this , OtherActivity.class));
        prog.setHeaderIcon(R.drawable.tools);
        // 设置菜单头的标题
        prog.setHeaderTitle("选择您要启动的程序");
        // 添加菜单项
        MenuItem item = prog.add("查看经典Java EE");
        //为菜单项设置关联的Activity
        item.setIntent(new Intent(this , OtherActivity.class));
        return super.onCreateOptionsMenu(menu);
    }

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:title="@string/font_size"
        android:icon="@drawable/font">
        <menu>
            <!-- 定义一组单选菜单项 -->
            <group android:checkableBehavior="single">
                <!-- 定义多个菜单项 -->
                <item
                    android:id="@+id/font_10"
                    android:title="@string/font_10"/>
                <item
                    android:id="@+id/font_12"
                    android:title="@string/font_12"/>
                <item
                    android:id="@+id/font_14"
                    android:title="@string/font_14"/>
                <item
                    android:id="@+id/font_16"
                    android:title="@string/font_16"/>
                <item
                    android:id="@+id/font_18"
                    android:title="@string/font_18"/>                                                                
            </group>
        </menu>
    </item>
    <!-- 定义一个普通菜单项 -->
    <item android:id="@+id/plain_item"
        android:title="@string/plain_item">
    </item>
    <item android:title="@string/font_color"
        android:icon="@drawable/color">
        <menu>
            <!-- 定义一组允许复选的菜单项 -->
            <group>
                <!-- 定义3个菜单项 -->
                <item
                    android:id="@+id/red_font"
                    android:title="@string/red_title"/>
                <item
                    android:id="@+id/green_font"
                    android:title="@string/green_title"/>
                <item
                    android:id="@+id/blue_font"
                    android:title="@string/blue_title"/>                        
            </group>
        </menu>
    </item>
</menu>

@Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        MenuInflater inflator = new MenuInflater(this);
        // 状态R.menu.context对应的菜单，并添加到menu中
        inflator.inflate(R.menu.my_menu, menu);
        return super.onCreateOptionsMenu(menu);
    }

    // 选项菜单的菜单项被单击后的回调方法
    public boolean onOptionsItemSelected(MenuItem mi)
    {
        if(mi.isCheckable())
        {
            mi.setChecked(true);  //②
        }
        // 判断单击的是哪个菜单项，并针对性的作出响应。
        switch (mi.getItemId())
        {
            case R.id.font_10:
                txt.setTextSize(10 * 2);
                break;
            case R.id.font_12:
                txt.setTextSize(12 * 2);
                break;
            case R.id.font_14:
                txt.setTextSize(14 * 2);
                break;
            case R.id.font_16:
                txt.setTextSize(16 * 2);
                break;
            case R.id.font_18:
                txt.setTextSize(18 * 2);
                break;
            case R.id.red_font:
                txt.setTextColor(Color.RED);
                mi.setChecked(true);
                break;
            case R.id.green_font:
                txt.setTextColor(Color.GREEN);
                mi.setChecked(true);
                break;
            case R.id.blue_font:
                txt.setTextColor(Color.BLUE);
                mi.setChecked(true);
                break;
            case R.id.plain_item:
                Toast toast = Toast.makeText(MenuResTest.this, "您单击了普通菜单项",
                        Toast.LENGTH_SHORT);
                toast.show();
                break;
        }
        return true;
    }