anotherim/src/main/res/layout/activity_trust_keys.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="?attr/color_background_secondary">

        <include android:id="@+id/toolbar"
            layout="@layout/toolbar" />

        <ScrollView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/toolbar"
            android:layout_above="@+id/button_bar">

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

                <android.support.v7.widget.CardView
                    android:id="@+id/key_error_message_card"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginBottom="@dimen/activity_vertical_margin"
                    android:layout_marginLeft="@dimen/activity_horizontal_margin"
                    android:layout_marginRight="@dimen/activity_horizontal_margin"
                    android:layout_marginTop="@dimen/activity_vertical_margin"
                    android:visibility="gone">

                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:orientation="vertical">
                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:orientation="vertical"
                        android:padding="@dimen/card_padding_regular">

                        <TextView
                            android:id="@+id/key_error_message_title"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:text="@string/error_trustkeys_title"
                            android:textAppearance="@style/TextAppearance.Conversations.Title"
                            android:layout_marginBottom="8sp"/>

                        <TextView
                            android:id="@+id/key_error_message"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:textAppearance="@style/TextAppearance.Conversations.Subhead"/>
                        <TextView
                            android:id="@+id/key_error_general"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:textAppearance="@style/TextAppearance.Conversations.Body1"/>
                        <TextView
                            android:layout_marginTop="8sp"
                            android:id="@+id/key_error_hint_mutual"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:textAppearance="@style/TextAppearance.Conversations.Body1.Secondary"
                            android:text="@string/error_trustkey_hint_mutual"/>
                    </LinearLayout>
                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_gravity="right"
                        android:gravity="right">

                        <Button
                            android:id="@+id/disable_button"
                            style="@style/Widget.Conversations.Button.Borderless"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:minWidth="0dp"
                            android:paddingLeft="16dp"
                            android:paddingRight="16dp"
                            android:text="@string/disable_encryption"
                            android:textColor="@color/accent"/>
                    </LinearLayout>
                    </LinearLayout>

                </android.support.v7.widget.CardView>

                <android.support.v7.widget.CardView
                    android:id="@+id/own_keys_card"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginBottom="@dimen/activity_vertical_margin"
                    android:layout_marginLeft="@dimen/activity_horizontal_margin"
                    android:layout_marginRight="@dimen/activity_horizontal_margin"
                    android:layout_marginTop="@dimen/activity_vertical_margin"
                    android:visibility="gone">

                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:orientation="vertical"
                        android:padding="@dimen/card_padding_list">

                        <TextView
                            android:id="@+id/own_keys_title"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_margin="@dimen/list_padding"
                            android:textAppearance="@style/TextAppearance.Conversations.Title"/>

                        <LinearLayout
                            android:id="@+id/own_keys_details"
                            android:layout_width="fill_parent"
                            android:layout_height="wrap_content"
                            android:orientation="vertical"/>
                    </LinearLayout>

                </android.support.v7.widget.CardView>

                <LinearLayout
                    android:id="@+id/foreign_keys"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical"
                    android:visibility="gone">

                </LinearLayout>

            </LinearLayout>
        </ScrollView>

        <LinearLayout
            android:id="@+id/button_bar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_alignParentEnd="true"
            android:layout_alignParentLeft="true"
            android:layout_alignParentRight="true"
            android:layout_alignParentStart="true">

            <Button
                android:id="@+id/cancel_button"
                style="@style/Widget.Conversations.Button.Borderless"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="@string/cancel"/>

            <View
                android:layout_width="1dp"
                android:layout_height="fill_parent"
                android:layout_marginBottom="7dp"
                android:layout_marginTop="7dp"
                android:background="?attr/divider"/>

            <Button
                android:id="@+id/save_button"
                style="@style/Widget.Conversations.Button.Borderless"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:enabled="true"
                android:text="@string/done"/>
        </LinearLayout>
    </RelativeLayout>
</layout>