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;    }