A ViewPager não fica debaixo da TableLayout
mesmo se colocar a tag abaixo
[XML]
android:layout_above="@+id/tab_layout"
[/XML]

o código completo em xml abaixo

[XML]

xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.felipe.chat.ChatsActivity">

android:id="@+id/tab_Layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>

android:id="@+id/viewPager"
android:layout_above="@+id/tab_layout"
android:layout_alignBottom="@id/tab_Layout"
android:layout_width="match_parent"
android:layout_height="wrap_content" />


[/XML]

Como que fica na execução

[XML]

xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.felipe.chat.ChatsActivity">

android:id="@ id/tab_Layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>

android:id="@ id/viewPager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@ id/tab_layout"
android:layout_alignBottom="@id/tab_Layout"/>



[/XML]

xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.felipe.chat.ChatsActivity">

android:id="@ id/tab_Layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>

android:id="@ id/viewPager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@ id/tab_layout"
android:layout_alignBottom="@id/tab_Layout"/>

Olá 

Obrigada pela mensagem, já estamos verificando a sua duvida, e em breve iremos lhe responder :)

Att