How to use androidx.recyclerview.widget.RecyclerView with tools:listitem?

Question

How to use androidx.recyclerview.widget.RecyclerView with tools:listitem? I have this layout:

Answer 1

From your code it seems that your recyclerview is the root element of the XML, and is missing the reference from xmlns:tools

Try to use another root element, as a constraint layout or even just layout as per example of google sunflowerapp:

<layout 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">

    <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/plant_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:clipToPadding="false"
            android:paddingLeft="@dimen/margin_normal"
            android:paddingRight="@dimen/margin_normal"
            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
            tools:context="com.google.samples.apps.sunflower.GardenActivity"
            tools:listitem="@layout/list_item_plant" />

</layout>