k-9/res/layout/message_view_header.xml

<?xml version="1.0" encoding="utf-8"?>
<com.fsck.k9.view.MessageHeader
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/header_container"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">

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

        <!-- Message header area -->
        <TableLayout
            android:id="@+id/top_container"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:stretchColumns="1"
            android:shrinkColumns="1"
            android:background="@drawable/message_view_header_background">

            <TableRow>

                <!-- Color chip -->
                <View
                    android:id="@+id/chip"
                    android:layout_marginRight="6dip"
                    android:layout_width="6dip"
                    android:layout_height="fill_parent"/>

                <LinearLayout
                    android:paddingTop="2dip"
                    android:paddingBottom="3dip"
                    android:layout_column="1"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <!-- Subject -->
                    <TextView
                        android:id="@+id/subject"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:maxLines="3"
                        android:ellipsize="end"
                        android:textSize="10sp"
                        android:textStyle="bold"
                        android:textColor="?android:attr/textColorSecondary"
                        android:textAppearance="?android:attr/textAppearanceSmall"/>

                    <!-- From -->
                    <LinearLayout
                        android:id="@+id/from_container"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content">

                        <TextView
                            android:id="@+id/from"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:paddingRight="6dip"
                            android:singleLine="true"
                            android:ellipsize="end"
                            android:textColor="?android:attr/textColorPrimary"
                            android:textAppearance="?android:attr/textAppearanceSmall"/>

                    </LinearLayout>

                    <!-- To -->
                    <LinearLayout
                        android:id="@+id/to_container"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:baselineAligned="true">

                        <TextView
                            android:id="@+id/to_label"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:paddingRight="4dip"
                            android:text="@string/message_to_label"
                            android:textSize="10sp"
                            android:textStyle="bold"
                            android:textColor="?android:attr/textColorSecondary"/>

                        <TextView
                            android:id="@+id/to"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:maxLines="2"
                            android:ellipsize="end"
                            android:textSize="10sp"
                            android:textColor="?android:attr/textColorSecondary"
                            android:textAppearance="?android:attr/textAppearanceSmall"/>

                    </LinearLayout>

                    <!-- CC -->
                    <LinearLayout
                        android:id="@+id/cc_container"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:baselineAligned="true">

                        <TextView
                            android:id="@+id/cc_label"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:paddingRight="4dip"
                            android:text="@string/message_view_cc_label"
                            android:textSize="10sp"
                            android:textStyle="bold"
                            android:textColor="?android:attr/textColorSecondary"/>

                        <TextView
                            android:id="@+id/cc"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:maxLines="2"
                            android:ellipsize="end"
                            android:textSize="10sp"
                            android:textColor="?android:attr/textColorSecondary"
                            android:textAppearance="?android:attr/textAppearanceSmall"/>

                    </LinearLayout>

                    <TextView
                        android:id="@+id/additional_headers_view"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:singleLine="false"
                        android:ellipsize="none"
                        android:textSize="10sp"
                        android:textColor="?android:attr/textColorSecondary"
                        android:textAppearance="?android:attr/textAppearanceSmall"/>

                </LinearLayout>

                <!-- Dummy column that is used to ensure the height of the table row is large
                     enough to fit the date/time column -->
                <LinearLayout
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <!-- Fixed spacing -->
                    <View
                        android:layout_width="0dp"
                        android:layout_height="18dp"/>

                    <!-- We don't want to hardcode the height of the star. The minHeight
                         is that of 'answered'. -->
                    <CheckBox
                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:minHeight="22sp"
                        android:focusable="false"
                        style="?android:attr/starStyle"/>

                    <!-- Two text views that will be set to the same height as their
                         counterparts in the next colum -->
                    <TextView
                        android:id="@+id/dummy_date"
                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:singleLine="true"/>

                    <TextView
                        android:id="@+id/dummy_time"
                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:textSize="10sp"
                        android:singleLine="true"/>

                </LinearLayout>

                <!-- Date/Time + Icons
                     The height of this column is 'fill_parent' so we can put the show more/less
                     indicator at the bottom. Unfortunately using 'fill_parent' also means that
                     the views in this column will be cut of if their combined height exceeds
                     that of the highest non-'fill_parent' column. That's why we need the dummy
                     column above. -->
                <LinearLayout
                    android:id="@+id/topright_container"
                    android:layout_marginTop="2dip"
                    android:layout_marginRight="6dip"
                    android:orientation="vertical"
                    android:layout_height="fill_parent"
                    android:layout_marginLeft="6dp"
                    android:gravity="right">

                    <LinearLayout
                        android:id="@+id/icons_container"
                        android:orientation="horizontal"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:gravity="center_vertical">

                        <View
                            android:id="@+id/answered"
                            android:layout_width="22sp"
                            android:layout_height="22sp"
                            android:paddingRight="4dip"
                            android:background="@drawable/ic_email_answered_small"/>

                        <CheckBox
                            android:id="@+id/flagged"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:focusable="false"
                            style="?android:attr/starStyle"/>

                    </LinearLayout>

                    <TextView
                        android:id="@+id/date"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:singleLine="true"
                        android:ellipsize="none"
                        android:textSize="10sp"
                        android:textColor="?android:attr/textColorPrimary"
                        android:textAppearance="?android:attr/textAppearanceSmall"/>

                    <TextView
                        android:id="@+id/time"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:textSize="10sp"
                        android:singleLine="true"
                        android:ellipsize="none"
                        android:textColor="?android:attr/textColorPrimary"
                        android:textAppearance="?android:attr/textAppearanceSmall"/>

                    <!-- View that will take up all available space between the time and
                         the show more/less indicator -->
                    <View
                        android:layout_width="0dp"
                        android:layout_height="0dp"
                        android:layout_weight="1"/>

                    <ImageView
                        android:id="@+id/show_additional_headers_icon"
                        android:src="@drawable/show_more"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginRight="6dp"
                        android:layout_marginBottom="3dip"/>

                </LinearLayout>

            </TableRow>

        </TableLayout>

        <View
            android:id="@+id/separator"
            android:layout_width="fill_parent"
            android:layout_height="1.5dp"
            android:background="#59000000"/>

        <!-- Button area -->
        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:gravity="right"
            android:paddingLeft="6dip"
            android:paddingRight="6dip"
            android:paddingTop="4dip"
            android:baselineAligned="false">

            <Button
                android:id="@+id/show_pictures"
                android:layout_width="wrap_content"
                android:visibility="gone"
                android:layout_marginLeft="6dip"
                android:layout_marginBottom="4dip"
                android:layout_height="wrap_content"
                android:text="@string/message_view_show_pictures_action"
                style="?android:attr/buttonStyleSmall"/>

            <Button
                android:id="@+id/show_attachments"
                android:visibility="gone"
                android:layout_marginLeft="6dip"
                android:layout_marginBottom="4dip"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/message_view_show_attachments_action"
                style="?android:attr/buttonStyleSmall"/>

            <Button
                android:id="@+id/show_message"
                android:visibility="gone"
                android:layout_marginLeft="6dip"
                android:layout_marginBottom="4dip"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/message_view_show_message_action"
                style="?android:attr/buttonStyleSmall"/>

        </LinearLayout>

        <include layout="@layout/message_view_crypto_layout"/>

    </LinearLayout>

</com.fsck.k9.view.MessageHeader>