Android layout with scrolling middle and fixed button bar at bottom of screen (button bar not showing) -

i'm working on screen layout having problem.

it has toolbar (being set action bar), scrolling pane , button bar @ bottom fixed bottom of screen visible.

for reason though button bar , buttons not visible if scroll bottom of screen, there no sign of them.

below xml layout

<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:ads="http://schemas.android.com/apk/res-auto"     android:layout_height="match_parent"     android:layout_width="match_parent">     <linearlayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:orientation="vertical">         <include layout="@layout/toolbar" />         <scrollview             xmlns:ads="http://schemas.android.com/apk/res-auto"             android:layout_width="match_parent"             android:layout_height="wrap_content">             <linearlayout                 android:id="@+id/relativelayout"                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:orientation="vertical" >                 <android.support.design.widget.textinputlayout                     android:layout_width="match_parent"                     android:layout_height="wrap_content">                     <edittext android:id="@+id/db_txtconnectionname"                         android:layout_width="fill_parent"                         android:layout_height="wrap_content"                         android:hint="database connection name"                         android:singleline="true"                         android:inputtype="textnosuggestions" />                 </android.support.design.widget.textinputlayout>                 <android.support.design.widget.textinputlayout                     android:layout_width="match_parent"                     android:layout_height="wrap_content">                     <edittext android:id="@+id/db_txtserver"                         android:layout_width="fill_parent"                         android:layout_height="wrap_content"                         android:hint="server"                         android:singleline="true"                         android:inputtype="textnosuggestions" />                 </android.support.design.widget.textinputlayout>                 <android.support.design.widget.textinputlayout                     android:layout_width="match_parent"                     android:layout_height="wrap_content">                     <edittext android:id="@+id/db_txtusername"                         android:layout_width="fill_parent"                         android:layout_height="wrap_content"                         android:hint="username"                         android:singleline="true"                         android:inputtype="textnosuggestions" />                 </android.support.design.widget.textinputlayout>                 <android.support.design.widget.textinputlayout                     android:layout_width="match_parent"                     android:layout_height="wrap_content">                     <edittext android:id="@+id/db_txtpassword"                         android:layout_width="fill_parent"                         android:layout_height="wrap_content"                         android:hint="password"                         android:singleline="true"                         android:inputtype="textpassword" />                 </android.support.design.widget.textinputlayout>                 <edittext android:id="@+id/db_txtdatabase"                     android:layout_width="fill_parent"                     android:layout_height="wrap_content"                     android:hint="database"                     android:singleline="true"                     android:inputtype="textnosuggestions" />                 <android.support.design.widget.textinputlayout                     android:layout_width="match_parent"                     android:layout_height="wrap_content">                     <edittext android:id="@+id/db_txtport"                         android:layout_width="fill_parent"                         android:layout_height="wrap_content"                         android:maxlength="6"                         android:hint="port"                         android:text="3306"                         android:singleline="true"                         android:inputtype="number"/>                 </android.support.design.widget.textinputlayout>                 <checkbox android:id="@+id/db_chkstorepassword"                     android:layout_width="fill_parent"                     android:layout_height="wrap_content"                     android:text="@string/store_password"                     android:checked="true" />                 <checkbox android:id="@+id/db_chkconnectviasshtunnel"                     android:layout_width="match_parent"                     android:layout_height="wrap_content"                     android:text="connect via ssh tunnel"/>                      <textview                         android:layout_width="match_parent"                         android:layout_height="wrap_content"                         android:textstyle="bold"                         android:text="ssh connection settings" />                     <android.support.design.widget.textinputlayout                         android:layout_width="match_parent"                         android:layout_height="wrap_content">                         <edittext android:id="@+id/db_txtsshhost"                             android:layout_width="match_parent"                             android:layout_height="wrap_content"                             android:hint="ssh host"                             android:singleline="true"                             android:inputtype="textnosuggestions"/>                     </android.support.design.widget.textinputlayout>                     <android.support.design.widget.textinputlayout                         android:layout_width="match_parent"                         android:layout_height="wrap_content">                         <edittext android:id="@+id/db_txtsshusername"                             android:layout_width="match_parent"                             android:layout_height="wrap_content"                             android:hint="ssh username"                             android:singleline="true"                             android:inputtype="textnosuggestions"/>                     </android.support.design.widget.textinputlayout>                     <android.support.design.widget.textinputlayout                         android:layout_width="match_parent"                         android:layout_height="wrap_content">                         <edittext android:id="@+id/db_txtsshpassword"                             android:layout_width="match_parent"                             android:layout_height="wrap_content"                             android:hint="ssh password"                             android:singleline="true"                             android:inputtype="textpassword"/>                     </android.support.design.widget.textinputlayout>                     <android.support.design.widget.textinputlayout                         android:layout_width="match_parent"                         android:layout_height="wrap_content">                         <edittext android:id="@+id/db_txtsshport"                             android:layout_width="match_parent"                             android:layout_height="wrap_content"                             android:hint="ssh port"                             android:text="22"                             android:singleline="true"                             android:inputtype="number"/>                     </android.support.design.widget.textinputlayout>                 <textview                     android:layout_margintop="10dp"                     android:layout_margin="10dp"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:gravity="center_horizontal"                     android:layout_gravity="center_horizontal"                     android:text="leave database blank connect database on server" />             </linearlayout>         </scrollview>         <linearlayout android:id="@+id/buttoncontainer"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:orientation="horizontal"             style="?android:attr/buttonbarstyle"             android:layout_alignparentbottom="true"             android:layout_gravity="bottom">             <button android:id="@+id/db_btntest"                 android:layout_width="0dp"                 android:layout_height="wrap_content"                 android:layout_weight="1"                 android:text="test connection" />             <button android:id="@+id/db_btncreateedit"                 android:layout_width="0dp"                 android:layout_height="wrap_content"                 android:layout_weight="1"                 android:text="create"                 android:enabled="false" />         </linearlayout>         <com.google.android.gms.ads.adview android:id="@+id/adview"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:layout_gravity="center"             ads:adsize="banner"/>     </linearlayout> </relativelayout> 

thanks can provide.