Элемент RecyclerView использует constraintLayout в качестве root макета.
Элемент RecyclerView использует constraintLayout в качестве root макета. Он содержит только TextView.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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="wrap_content">
<TextView
android:id="@+id/tvInRv"
android:layout_width="0dp"
android:layout_height="48dp"
android:gravity="center"
android:textColor="@color/colorPrimary"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="Hello world" />
</android.support.constraint.ConstraintLayout>
RecyclerView в ConstraintLayout
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
tools:context=".findviewbyid.FindViewByIdActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/rv"
android:layout_width="0dp"
android:layout_height="200dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
Затем элементы не отображаются, пока я не прокручиваю RecyclerView.