res/layout/guided_action_editable.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ 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.
  -->

<android.support.v17.leanback.widget.GuidedActionItemContainer
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/guidedactions_editable"
    style="?attr/guidedActionItemContainerStyle"
    android:layout_height="88dp">

    <android.support.v17.leanback.widget.NonOverlappingLinearLayout
        android:id="@+id/guidedactions_item_content"
        style="?attr/guidedActionItemContentStyle" >

        <EditText
            android:id="@+id/guidedactions_item_title"
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            android:textColor="@color/lb_guidedactions_item_unselected_text_color"
            android:textSize="16sp" />

        <android.support.v17.leanback.widget.GuidedActionEditText
            android:id="@+id/guidedactions_item_description"
            style="?attr/guidedActionItemDescriptionStyle" />

    </android.support.v17.leanback.widget.NonOverlappingLinearLayout>

</android.support.v17.leanback.widget.GuidedActionItemContainer>