conversations-classic/src/main/res/layout/fragment_conversation.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:id="@+id/messages_view"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/snackbar"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:background="?attr/color_background_secondary"
        android:divider="@null"
        android:dividerHeight="0dp"
        android:listSelector="@android:color/transparent"
        android:stackFromBottom="true"
        android:transcriptMode="normal"
        tools:listitem="@layout/message_sent">
    </ListView>

    <RelativeLayout
        android:id="@+id/textsend"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:background="?attr/color_background_primary" >

        <eu.siacs.conversations.ui.EditMessage
            android:id="@+id/textinput"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_toLeftOf="@+id/textSendButton"
            android:background="?attr/color_background_primary"
            android:ems="10"
            android:imeOptions="flagNoExtractUi|actionSend"
            android:inputType="textShortMessage|textMultiLine|textCapSentences"
            android:minHeight="48dp"
            android:minLines="1"
            android:paddingBottom="12dp"
            android:paddingLeft="8dp"
            android:paddingRight="8dp"
            android:paddingTop="12dp"
            android:textColor="?attr/color_text_primary" >

            <requestFocus />
        </eu.siacs.conversations.ui.EditMessage>

        <ImageButton
            android:id="@+id/textSendButton"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:background="?attr/color_background_primary"
            android:src="?attr/ic_send_text_offline" />
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/snackbar"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/textsend"
        android:layout_marginBottom="4dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:background="@drawable/snackbar"
        android:minHeight="48dp"
        android:visibility="gone" >

        <TextView
            android:id="@+id/snackbar_message"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:layout_toLeftOf="@+id/snackbar_action"
            android:paddingLeft="24dp"
            android:textColor="@color/white"
            android:textSize="?attr/TextSizeBody" />

        <TextView
            android:id="@+id/snackbar_action"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:paddingBottom="16dp"
            android:paddingLeft="24dp"
            android:paddingRight="24dp"
            android:paddingTop="16dp"
            android:textAllCaps="true"
            android:textColor="@color/white"
            android:textSize="?attr/TextSizeBody"
            android:textStyle="bold" />
    </RelativeLayout>

</RelativeLayout>