res/layout/lineageparts.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
/*
** Copyright 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_height="match_parent"
              android:layout_width="match_parent">

    <LinearLayout
            android:orientation="vertical"
            android:layout_height="0px"
            android:layout_width="match_parent"
            android:layout_weight="1">

        <org.lineageos.lineageparts.widget.SwitchBar
            android:id="@+id/switch_bar"
                  android:layout_height="?android:attr/actionBarSize"
                  android:layout_width="match_parent"
                  android:background="@drawable/switchbar_background"
                  android:theme="?attr/switchBarTheme"
                />

        <FrameLayout
                android:id="@+id/main_content"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                />

    </LinearLayout>

    <RelativeLayout android:id="@+id/button_bar"
                    android:layout_height="wrap_content"
                    android:layout_width="match_parent"
                    android:layout_weight="0"
                    android:visibility="gone">

        <Button android:id="@+id/back_button"
                android:layout_width="150dip"
                android:layout_height="wrap_content"
                android:layout_margin="5dip"
                android:layout_alignParentStart="true"
                android:text="@*android:string/back_button_label"
                />

        <LinearLayout
                android:orientation="horizontal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentEnd="true">

            <Button android:id="@+id/skip_button"
                    android:layout_width="150dip"
                    android:layout_height="wrap_content"
                    android:layout_margin="5dip"
                    android:text="@*android:string/skip_button_label"
                    android:visibility="gone"
                    />

            <Button android:id="@+id/next_button"
                    android:layout_width="150dip"
                    android:layout_height="wrap_content"
                    android:layout_margin="5dip"
                    android:text="@*android:string/next_button_label"
                    />

        </LinearLayout>

    </RelativeLayout>

</LinearLayout>