<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
   <group android:checkableBehavior="single">
    <item
    android:id="@+id/home"
    android:title="Home"
    android:icon="@drawable/ic_launcher_background">
   </item>
    <item
        android:id="@+id/register"
        android:title="Register"
        android:icon="@drawable/ic_launcher_background">
    </item>
    <item
        android:id="@+id/setting"
        android:title="Setting"
        android:icon="@drawable/ic_launcher_background">
    </item>


<item android:title="Communicate">
    <menu><group android:checkableBehavior="single">
        <item
            android:id="@+id/exit"
            android:title="Exit"
            android:icon="@drawable/ic_launcher_background">
        </item>
    </group>
    </menu>
</item>
   </group>
</menu>