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

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

    <ImageView
        android:id="@+id/message_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="4dp"
        android:layout_marginTop="8dp"
        android:adjustViewBounds="true"
        android:background="@color/black87"
        android:longClickable="true"
        android:scaleType="centerCrop"/>

    <eu.siacs.conversations.ui.widget.CopyTextView
        android:id="@+id/message_body"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:autoLink="web"
        android:longClickable="true"
        android:textAppearance="@style/TextAppearance.Conversations.Body1"/>

    <Button
        android:id="@+id/download_button"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:longClickable="true"
        android:visibility="gone"/>

    <RelativeLayout
        android:id="@+id/audio_player"
        android:layout_width="@dimen/audio_player_width"
        android:layout_height="wrap_content"
        android:visibility="gone"
        >

        <ImageButton
            android:id="@+id/play_pause"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:alpha="?attr/icon_alpha"
            android:background="?android:selectableItemBackground"/>

        <TextView
            android:id="@+id/runtime"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:layout_alignParentRight="true"
            android:paddingBottom="16dp"
            android:paddingRight="16dp"
            android:textAppearance="@style/TextAppearance.Conversations.Caption"/>

        <SeekBar
            android:id="@+id/progress"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/runtime"
            android:layout_centerVertical="true"
            android:layout_toRightOf="@+id/play_pause"
            android:progress="100"/>
    </RelativeLayout>

</merge>