E/RecyclerView: No layout manager attached; skipping layout

아래의 오류는 RecyclerView에 Layout Manager를 설정하지 않아 서 발생합니다.

E/RecyclerView: No layout manager attached; skipping layout

 

아래와 같이 RecyclerView에 layoutManager를 설정하면 됩니다.

app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_list"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>