WordPress/src/main/res/layout/reader_activity_subs.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/white">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <include
            android:id="@+id/toolbar"
            layout="@layout/toolbar" />

        <android.support.design.widget.TabLayout
            android:id="@+id/tab_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/toolbar"
            android:background="@color/tab_background"
            app:tabIndicatorColor="@color/tab_indicator" />
    </android.support.design.widget.AppBarLayout>

    <org.wordpress.android.widgets.WPViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/divider_list"
        android:layout_below="@+id/appbar" />

    <View
        android:id="@+id/divider_list"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_above="@+id/layout_bottom"
        android:layout_alignWithParentIfMissing="true"
        android:background="@color/reader_divider_grey" />

    <LinearLayout
        android:id="@+id/layout_bottom"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:paddingBottom="@dimen/margin_medium"
        android:paddingLeft="@dimen/margin_medium"
        android:paddingRight="@dimen/margin_extra_large"
        android:paddingTop="@dimen/margin_small">

        <EditText
            android:id="@+id/edit_add"
            style="@style/ReaderEditText.Topic"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:hint="@string/reader_hint_add_tag_or_url" />

        <ImageButton
            android:id="@+id/btn_add"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="?android:selectableItemBackground"
            android:padding="@dimen/margin_small"
            android:contentDescription="@string/add"
            app:srcCompat="@drawable/reader_follow" />

    </LinearLayout>

    <ProgressBar
        android:id="@+id/progress_follow"
        style="@style/ReaderProgressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:visibility="gone" />

</RelativeLayout>