res/layout/encryption_interstitial.xml

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

<!--
  ~ Copyright (C) 2014 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"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingStart="?attr/side_margin"
        android:paddingEnd="?attr/side_margin">

    <TextView
            android:id="@+id/encryption_message"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            android:layout_marginStart="?android:attr/listPreferredItemPaddingStart"
            android:layout_marginEnd="?android:attr/listPreferredItemPaddingEnd"
            android:textAppearance="?android:attr/textAppearanceMedium" />

    <RadioGroup
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            android:layout_marginStart="?android:attr/listPreferredItemPaddingStart"
            android:layout_marginEnd="?android:attr/listPreferredItemPaddingEnd"
            android:checkedButton="@+id/encrypt_require_password">

        <RadioButton
                android:id="@+id/encrypt_require_password"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp" />

        <RadioButton
                android:id="@+id/encrypt_dont_require_password"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp" />

    </RadioGroup>

</LinearLayout>