android - Changing the item text size in navigation view -

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i creating navigation drawer in android , have added items in menu_main.xml not able change size of menu items. below code menu_main.xml: 

  <menu xmlns:android="http://schemas.android.com/apk/res/android">     <group android:checkablebehavior="single">     <item         android:id="@+id/motel"         android:title="motel">     </item>     <item         android:id="@+id/packages"         android:title="packages">     </item>     </group> </menu>

create style , apply navigationview using app:theme

<style name="navigationviewstyle">      <item name="android:textsize">20sp</item> <!-- menu item text size-->      <item name="android:listpreferreditemheightsmall">40dp</item><!-- menu item height--> </style>

and said, apply style navigationview using app:theme

<android.support.design.widget.navigationview        ...        ...             app:theme="@style/navigationviewstyle"        ...        ...   </android.support.design.widget.navigationview>

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