current/support/v7/preference/res/layout/preference_dialog_edittext.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2015 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
  -->

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="48dp"
    android:layout_marginBottom="48dp"
    android:overScrollMode="ifContentScrolls">

  <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:padding="5dip"
      android:orientation="vertical">

    <TextView android:id="@android:id/message"
        style="?android:attr/textAppearanceSmall"
        android:layout_marginBottom="48dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="?android:attr/textColorSecondary" />

      <EditText
          android:id="@android:id/edit"
          android:layout_width="match_parent"
          android:layout_height="wrap_content" />

  </LinearLayout>

</ScrollView>