leanback/src/androidTest/res/layout/horizontal_linear_rtl.xml

<!--
  ~ Copyright (C) 2017 The Android Open Source Project
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~      http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License.
  -->

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:lb="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layoutDirection="rtl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
  <androidx.leanback.widget.HorizontalGridViewEx
      android:id="@+id/gridview"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:clipToPadding="false"
      android:focusable="true"
      android:focusableInTouchMode="true"
      android:background="#00ffff"
      android:horizontalSpacing="12dip"
      android:verticalSpacing="24dip"
      lb:numberOfColumns="1"
      lb:columnWidth="150dip"
      android:paddingBottom="12dip"
      android:paddingLeft="12dip"
      android:paddingRight="12dip"
      android:paddingTop="12dip" />
</LinearLayout>