res-common/layout/edit_expansion_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2012 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
  -->

<!-- "More" or "less" expansion button in the contact editor. -->

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="@dimen/editor_min_line_item_height"
    android:layout_gravity="top">
    <ImageView
        android:id="@+id/expansion_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:duplicateParentState="true"
        android:background="?android:attr/selectableItemBackground"
        android:paddingLeft="@dimen/editor_round_button_padding_left"
        android:paddingRight="@dimen/editor_round_button_padding_right"
        android:paddingTop="@dimen/editor_round_button_padding_top"
        android:paddingBottom="@dimen/editor_round_button_padding_bottom" />
</FrameLayout>