ring-android/app/src/main/res/layout/activity_conversation.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ebeff0"
    android:orientation="vertical"
    tools:context=".client.ConversationActivity">

    <android.support.v7.widget.Toolbar
        android:id="@+id/main_toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:background="@color/color_primary_light"
        android:elevation="4dp"
        android:popupTheme="@style/Theme.AppCompat.Light.NoActionBar"
        android:titleTextAppearance="@style/ToolbarTitle"

        android:minHeight="?attr/actionBarSize"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        app:contentInsetStart="72dp"
        app:elevation="4dp"
        app:titleTextAppearance="@style/ToolbarTitle" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/hist_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/main_toolbar"
        android:layout_above="@+id/userInputMessageCardView"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentStart="true"
        android:clipToPadding="false"
        android:divider="@null"
        android:listSelector="@android:color/transparent"
        android:paddingTop="8dp"
        tools:listitem="@layout/item_conv_msg_peer" />

    <RelativeLayout
        android:id="@+id/ongoingcall_pane"
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:layout_below="@id/main_toolbar"
        android:background="#e3c1c1">

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:layout_margin="10dp"
            android:text="@string/ongoing_call"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:textColor="@color/text_color_primary" />
    </RelativeLayout>

    <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:id="@+id/userInputMessageCardView"
        android:layout_width="match_parent"
        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"
        android:layout_marginBottom="16dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        card_view:cardCornerRadius="2dp">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal">

            <Spinner
                android:id="@+id/number_selector"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:visibility="visible"
                tools:listitem="@layout/item_number_selected" />

            <EditText
                android:id="@+id/msg_input_txt"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="@null"
                android:hint="@string/write_a_message"
                android:imeOptions="actionSend|flagNoExtractUi"
                android:inputType="textShortMessage|textImeMultiLine|text|textMultiLine|textCapSentences"
                android:maxLines="5"
                android:padding="8dp" />

            <ImageButton
                android:id="@+id/msg_send"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:background="?selectableItemBackgroundBorderless"
                android:contentDescription="@string/send_message"
                android:padding="8dp"
                android:src="@drawable/ic_send_black_24dp"
                android:tint="@android:color/darker_gray" />
        </LinearLayout>
    </android.support.v7.widget.CardView>

</RelativeLayout>