mihon/app/src/main/res/menu/library.xml

<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=".MainActivity">

    <item
        android:id="@+id/action_search"
        android:icon="@drawable/ic_search_white_24dp"
        android:title="@string/action_search"
        app:actionViewClass="android.support.v7.widget.SearchView"
        app:showAsAction="collapseActionView|ifRoom"/>

    <item
        android:id="@+id/action_filter"
        android:icon="@drawable/ic_filter_list_white_24dp"
        android:title="@string/action_filter"
        app:showAsAction="ifRoom"/>

    <item
        android:id="@+id/action_update_library"
        android:icon="@drawable/ic_refresh_white_24dp"
        android:title="@string/action_update_library"
        app:showAsAction="ifRoom"/>

    <item
        android:id="@+id/action_edit_categories"
        android:title="@string/action_edit_categories"
        app:showAsAction="never"/>

</menu>