FairEmail/app/src/main/res/layout/activity_eml.xml

<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context="eu.faircode.email.ActivityEML">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/tvHint"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="3dp"
                android:text="@string/title_hint_eml"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textStyle="italic"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <View
                android:id="@+id/vSeparatorHeader"
                android:layout_width="0dp"
                android:layout_height="1dp"
                android:layout_marginTop="3dp"
                android:background="?attr/colorSeparator"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/tvHint" />

            <TextView
                android:id="@+id/tvFromTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/title_from"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textStyle="bold"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/vSeparatorHeader" />

            <eu.faircode.email.FixedTextView
                android:id="@+id/tvFrom"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="6dp"
                android:text="From"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textIsSelectable="true"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@id/tvFromTitle"
                app:layout_constraintTop_toBottomOf="@id/vSeparatorHeader" />

            <TextView
                android:id="@+id/tvToTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/title_to"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textStyle="bold"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/tvFrom" />

            <eu.faircode.email.FixedTextView
                android:id="@+id/tvTo"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="6dp"
                android:text="To"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textIsSelectable="true"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@id/tvToTitle"
                app:layout_constraintTop_toBottomOf="@id/tvFrom" />

            <TextView
                android:id="@+id/tvReplyToTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/title_reply_to"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textStyle="bold"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/tvTo" />

            <eu.faircode.email.FixedTextView
                android:id="@+id/tvReplyTo"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="6dp"
                android:text="Reply to"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textIsSelectable="true"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@id/tvReplyToTitle"
                app:layout_constraintTop_toBottomOf="@id/tvTo" />

            <TextView
                android:id="@+id/tvCcTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/title_cc"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textStyle="bold"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/tvReplyTo" />

            <eu.faircode.email.FixedTextView
                android:id="@+id/tvCc"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="6dp"
                android:text="Cc"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textIsSelectable="true"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@id/tvCcTitle"
                app:layout_constraintTop_toBottomOf="@id/tvReplyTo" />

            <TextView
                android:id="@+id/tvSentTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/title_sent"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textStyle="bold"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/tvCc" />

            <eu.faircode.email.FixedTextView
                android:id="@+id/tvSent"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="6dp"
                android:text="Sent"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textIsSelectable="true"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@id/tvSentTitle"
                app:layout_constraintTop_toBottomOf="@id/tvCc" />

            <TextView
                android:id="@+id/tvReceivedTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/title_received"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textStyle="bold"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/tvSent" />

            <eu.faircode.email.FixedTextView
                android:id="@+id/tvReceived"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="6dp"
                android:text="Received"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textIsSelectable="true"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@id/tvReceivedTitle"
                app:layout_constraintTop_toBottomOf="@id/tvSent" />

            <eu.faircode.email.FixedTextView
                android:id="@+id/tvSubject"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:text="Subject"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textIsSelectable="true"
                android:textStyle="italic"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/tvReceived" />

            <View
                android:id="@+id/vSeparatorAttachments"
                android:layout_width="0dp"
                android:layout_height="1dp"
                android:layout_marginTop="3dp"
                android:background="?attr/colorSeparator"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/tvSubject" />

            <androidx.recyclerview.widget.RecyclerView
                android:id="@+id/rvAttachment"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/vSeparatorAttachments" />

            <View
                android:id="@+id/vSeparatorBody"
                android:layout_width="0dp"
                android:layout_height="1dp"
                android:layout_marginTop="3dp"
                android:background="?attr/colorSeparator"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/rvAttachment" />

            <eu.faircode.email.FixedTextView
                android:id="@+id/tvBody"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="3dp"
                android:fontFamily="monospace"
                android:text="Body"
                android:textAppearance="@style/TextAppearance.AppCompat.Small"
                android:textIsSelectable="true"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/vSeparatorBody" />

            <androidx.constraintlayout.widget.Group
                android:id="@+id/grpReady"
                android:layout_width="0dp"
                android:layout_height="0dp"
                app:constraint_referenced_ids="
                    vSeparatorHeader,
                    tvFromTitle,tvFrom,
                    tvToTitle,tvTo,
                    tvReplyToTitle,tvReplyTo,
                    tvCcTitle,tvCc,
                    tvSentTitle,tvSent,
                    tvReceivedTitle,tvReceived,
                    tvSubject,
                    rvAttachment,
                    vSeparatorBody,tvBody" />
        </androidx.constraintlayout.widget.ConstraintLayout>
    </ScrollView>

    <eu.faircode.email.ContentLoadingProgressBar
        android:id="@+id/pbWait"
        style="@style/Base.Widget.AppCompat.ProgressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:indeterminate="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>