RetroMusicPlayer/app/src/main/res/menu/menu_main.xml

<!--
  ~ Copyright (c) 2019 Hemanth Savarala.
  ~
  ~ Licensed under the GNU General Public License v3
  ~
  ~ This is free software: you can redistribute it and/or modify it under
  ~ the terms of the GNU General Public License as published by
  ~  the Free Software Foundation either version 3 of the License, or (at your option) any later version.
  ~
  ~ This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  ~ without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  ~ See the GNU General Public License for more details.
  -->

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".DrawerActivity">


    <item
        android:id="@+id/action_grid_size"
        android:icon="@drawable/ic_grid_size"
        android:orderInCategory="5"
        android:title="@string/action_grid_size"
        app:showAsAction="ifRoom">
        <menu>
            <group
                android:id="@+id/group_grid_size"
                android:checkableBehavior="single">
                <item
                    android:id="@+id/action_grid_size_1"
                    android:title="@string/grid_size_1" />
                <item
                    android:id="@+id/action_grid_size_2"
                    android:title="@string/grid_size_2" />
                <item
                    android:id="@+id/action_grid_size_3"
                    android:title="@string/grid_size_3" />
                <item
                    android:id="@+id/action_grid_size_4"
                    android:title="@string/grid_size_4" />
                <item
                    android:id="@+id/action_grid_size_5"
                    android:title="@string/grid_size_5" />
                <item
                    android:id="@+id/action_grid_size_6"
                    android:title="@string/grid_size_6" />
                <item
                    android:id="@+id/action_grid_size_7"
                    android:title="@string/grid_size_7" />
                <item
                    android:id="@+id/action_grid_size_8"
                    android:title="@string/grid_size_8" />
            </group>
        </menu>
    </item>
    <item
        android:id="@+id/action_layout_type"
        android:icon="@drawable/ic_dashboard"
        android:orderInCategory="6"
        android:title="@string/grid_style_label"
        app:showAsAction="ifRoom">
        <menu>
            <group
                android:id="@+id/group_layout_type"
                android:checkableBehavior="single">
                <item
                    android:id="@+id/action_layout_normal"
                    android:checked="true"
                    android:title="@string/normal" />
                <item
                    android:id="@+id/action_layout_card"
                    android:title="@string/card" />
                <item
                    android:id="@+id/action_layout_colored_card"
                    android:title="@string/card_color_style" />
                <item
                    android:id="@+id/action_layout_circular"
                    android:title="@string/circular" />
                <item
                    android:id="@+id/action_layout_image"
                    android:title="@string/image" />
                <item
                    android:id="@+id/action_layout_gradient_image"
                    android:title="@string/image_gradient" />
            </group>
        </menu>
    </item>
    <item
        android:id="@+id/action_sort_order"
        android:icon="@drawable/ic_sort"
        android:orderInCategory="2"
        android:title="@string/action_sort_order"
        app:showAsAction="ifRoom">
        <menu></menu>
    </item>

</menu>