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

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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"
    android:orientation="vertical"
    tools:context=".ActivityView">

    <TextView
        android:id="@+id/tvFrom"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="6dp"
        android:layout_marginStart="6dp"
        android:layout_marginTop="3dp"
        android:text="From"
        android:textAppearance="@style/TextAppearance.AppCompat.Medium"
        android:textIsSelectable="true"
        app:layout_constraintEnd_toStartOf="@+id/tvTime"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tvTime"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="6dp"
        android:maxLines="1"
        android:text="Time"
        android:textAppearance="@style/TextAppearance.AppCompat.Small"
        android:textIsSelectable="true"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="@id/tvFrom" />

    <TextView
        android:id="@+id/tvSubject"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="6dp"
        android:layout_marginStart="6dp"
        android:text="Subject"
        android:textAppearance="@style/TextAppearance.AppCompat.Small"
        android:textIsSelectable="true"
        app:layout_constraintEnd_toStartOf="@+id/tvCount"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tvFrom" />

    <TextView
        android:id="@+id/tvCount"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="6dp"
        android:maxLines="1"
        android:text="3"
        android:textAppearance="@style/TextAppearance.AppCompat.Small"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="@id/tvSubject" />

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

    <TextView
        android:id="@+id/tvToTitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="6dp"
        android:layout_marginTop="3dp"
        android:text="@string/title_to"
        android:textAppearance="@style/TextAppearance.AppCompat.Small"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/vSeparatorAddress" />

    <TextView
        android:id="@+id/tvTo"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="6dp"
        android:layout_marginStart="6dp"
        android:layout_marginTop="3dp"
        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/vSeparatorAddress" />

    <TextView
        android:id="@+id/tvCcTitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="6dp"
        android:text="@string/title_cc"
        android:textAppearance="@style/TextAppearance.AppCompat.Small"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tvTo" />

    <TextView
        android:id="@+id/tvCc"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="6dp"
        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/tvTo" />

    <TextView
        android:id="@+id/tvBccTitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="6dp"
        android:text="@string/title_bcc"
        android:textAppearance="@style/TextAppearance.AppCompat.Small"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tvCc" />

    <TextView
        android:id="@+id/tvBcc"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="6dp"
        android:layout_marginStart="6dp"
        android:text="Bcc"
        android:textAppearance="@style/TextAppearance.AppCompat.Small"
        android:textIsSelectable="true"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/tvBccTitle"
        app:layout_constraintTop_toBottomOf="@id/tvCc" />

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

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rvAttachment"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="6dp"
        android:layout_marginStart="6dp"
        android:layout_marginTop="3dp"
        android:maxHeight="90dp"
        android:scrollbarStyle="outsideOverlay"
        android:scrollbars="vertical"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/vSeparatorAttachments" />

    <android.support.design.widget.BottomNavigationView
        android:id="@+id/top_navigation"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:layout_marginTop="3dp"
        android:background="@color/darkColorSeparator"
        app:itemIconTint="@color/colorActionForeground"
        app:itemTextColor="@color/colorActionForeground"
        app:labelVisibilityMode="unlabeled"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/rvAttachment"
        app:menu="@menu/action_view_top" />

    <ScrollView
        android:id="@+id/scroll"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginLeft="6dp"
        android:layout_marginRight="6dp"
        android:layout_marginTop="3dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toTopOf="@+id/bottom_navigation"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/top_navigation">

        <TextView
            android:id="@+id/tvBody"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fontFamily="monospace"
            android:text="Body"
            android:textAppearance="@style/TextAppearance.AppCompat.Small"
            android:textIsSelectable="true" />
    </ScrollView>

    <android.support.design.widget.BottomNavigationView
        android:id="@+id/bottom_navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="3dp"
        android:background="@color/colorPrimary"
        app:itemIconTint="@color/colorActionForeground"
        app:itemTextColor="@color/colorActionForeground"
        app:labelVisibilityMode="labeled"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:menu="@menu/action_view_bottom" />

    <ProgressBar
        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" />

    <android.support.constraint.Group
        android:id="@+id/grpAddress"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:constraint_referenced_ids="vSeparatorAddress,tvToTitle,tvTo,tvCcTitle,tvCc,tvBccTitle,tvBcc" />

    <android.support.constraint.Group
        android:id="@+id/grpAttachments"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:constraint_referenced_ids="vSeparatorAttachments,rvAttachment" />

    <android.support.constraint.Group
        android:id="@+id/grpReady"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:constraint_referenced_ids="tvFrom,tvTime,tvSubject,tvCount,top_navigation,scroll" />
</android.support.constraint.ConstraintLayout>