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

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

    <RelativeLayout
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="?attr/color_background_secondary">

        <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.widget.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:maxLines="8"
                android:minHeight="48dp"
                android:minLines="1"
                android:paddingBottom="12dp"
                android:paddingLeft="8dp"
                android:paddingRight="8dp"
                android:paddingTop="12dp">

                <requestFocus/>
            </eu.siacs.conversations.ui.widget.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:contentDescription="@string/send_message"
                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:textAppearance="@style/TextAppearance.Conversations.Body1.OnDark"/>

            <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:textAppearance="@style/TextAppearance.Conversations.Body1.OnDark"
                android:textStyle="bold"/>
        </RelativeLayout>

    </RelativeLayout>
</layout>