core/res/res/layout/number_picker.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
**
** Copyright 2008, 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.
*/
-->

<merge xmlns:android="http://schemas.android.com/apk/res/android">

    <ImageButton android:id="@+id/increment"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@android:drawable/numberpicker_up_btn"
        android:paddingTop="22dip"
        android:paddingBottom="22dip"
        android:contentDescription="@string/number_picker_increment_button" />

    <EditText
        android:id="@+id/numberpicker_input"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textAppearance="@style/TextAppearance.Large.Inverse.NumberPickerInputText"
        android:gravity="center"
        android:singleLine="true"
        android:background="@drawable/numberpicker_input" />

    <ImageButton android:id="@+id/decrement"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@android:drawable/numberpicker_down_btn"
        android:paddingTop="22dip"
        android:paddingBottom="22dip"
        android:contentDescription="@string/number_picker_decrement_button" />

</merge>