I have setUp tabLayout with ViewPager which has 5 Fragments. 
tabLayout with android:layout_gravity set to bottom . Third fragment has editText which when focused , my tabs come over the keyboard. 
Tablayout without EditText
TabLayout with EditText
Main layout :
    <?xml version="1.0" encoding="utf-8"?>
    <android.support.design.widget.CoordinatorLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/coordinatorLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <android.support.design.widget.AppBarLayout
            android:id="@+id/appBarLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
         <include
              android:id="@+id/t"
             layout="@layout/toolbar"/>
        </android.support.design.widget.AppBarLayout>
  <android.support.v4.view.ViewPager
    android:id="@+id/viewPager"
    android:layout_width="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"/>
  <android.support.design.widget.TabLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tab="http://schemas.android.com/tools"
    android:layout_gravity="bottom"
    app:tabGravity="fill"
    android:background="@color/colorPrimary"
    android:layout_alignParentBottom="true"
    android:id="@+id/tabs"
    app:layout_collapseMode="parallax"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    xmlns:android="http://schemas.android.com/apk/res/android">
    </android.support.design.widget.TabLayout></android.support.design.widget.CoordinatorLayout> 
Third Fragment layout :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:hint="Enter something"
        />
</LinearLayout> 
Open AndroidManifest.xml and add to your activity tag
android:windowSoftInputMode="adjustPan"
If this doesn't work add 
android:windowSoftInputMode="adjustNothing"
This will prevent the soft keyboard from adjusting the layout.
Hope this helps.
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