NewPipe-app-android/app/src/main/res/menu/search_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item android:id="@+id/action_search"
        android:icon="@android:drawable/ic_menu_search"
        app:showAsAction="ifRoom"
        android:title="@string/search"
        app:actionViewClass="android.support.v7.widget.SearchView" />

    <group android:id="@+id/search_filter_group"
        android:checkableBehavior="single"
        android:orderInCategory="999">
        <item android:id="@+id/menu_filter_all"
            android:title = "@string/all"
            android:checked = "true"/>
        <item android:id="@+id/menu_filter_video"
            android:title = "@string/video"/>
        <item android:id="@+id/menu_filter_channel"
            android:title = "@string/channel"/>
    </group>
</menu>