android - how to align the button at bottom in linear layout? -

i want keep adview layout @ bottom in linear layout. tried using gravity , layout_gravity @ bottom not working,i had attached code , snapshot too. please give me solution

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"     android:id="@+id/linearmainlayout"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:background="@drawable/inner_screen_bg"     android:orientation="vertical"     android:weightsum="10" >      <linearlayout         android:id="@+id/linear1"         android:layout_width="match_parent"         android:layout_height="0dp"         android:layout_weight="4"         android:orientation="horizontal"         android:paddingbottom="10dip"         android:paddingtop="5dip"         android:weightsum="100" >          <linearlayout             android:layout_width="0dip"             android:layout_height="match_parent"             android:layout_weight="20"             android:gravity="center_vertical"             android:orientation="vertical" >              <button                 android:id="@+id/fbshare"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:layout_gravity="center_horizontal"                 android:background="@drawable/fb_btn"                 android:textappearance="?android:attr/textappearancesmall" />              <button                 android:id="@+id/twittershare"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:layout_gravity="center_horizontal"                 android:background="@drawable/tw_btn"                 android:textappearance="?android:attr/textappearancesmall" />              <button                 android:id="@+id/revealbutton"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:layout_gravity="center_horizontal"                 android:background="@drawable/reveal_btn"                 android:textappearance="?android:attr/textappearancesmall" />         </linearlayout>          <relativelayout             android:id="@+id/imagecontainer"             android:layout_width="0dip"             android:layout_height="wrap_content"             android:layout_gravity="center_vertical|center_horizontal"             android:layout_marginright="10dip"             android:layout_margintop="3dp"             android:layout_weight="60"             android:orientation="vertical" >              <relativelayout                 android:id="@+id/imageview"                 android:layout_width="320dip"                 android:layout_height="150dip"                 android:layout_centerhorizontal="true"                 android:layout_centervertical="true"                 android:background="@drawable/image5" >                  <imageview                     android:id="@+id/correctmark"                     android:layout_width="80dip"                     android:layout_height="80dip"                     android:layout_alignparentbottom="true"                     android:layout_alignparentleft="true"                     android:layout_marginbottom="10dip"                     android:layout_marginleft="5dip"                     android:src="@drawable/cleared_imag"                     android:visibility="gone" />             </relativelayout>         </relativelayout>          <linearlayout             android:id="@+id/ticketcountercontainer"             android:layout_width="0dip"             android:layout_height="match_parent"             android:layout_weight="20"             android:gravity="center_vertical"             android:orientation="vertical" >              <button                 android:id="@+id/ticket1"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:background="@drawable/ticket"                 android:textappearance="?android:attr/textappearancesmall" />              <button                 android:id="@+id/ticket2"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:background="@drawable/ticket"                 android:textappearance="?android:attr/textappearancesmall" />              <button                 android:id="@+id/ticket3"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:background="@drawable/ticket"                 android:textappearance="?android:attr/textappearancesmall" />         </linearlayout>     </linearlayout>      <edittext         android:id="@+id/moviename"         android:layout_width="match_parent"         android:layout_height="0dp"         android:layout_below="@id/linear1"         android:layout_marginleft="10dip"         android:layout_marginright="10dip"         android:layout_weight="1"         android:background="@drawable/input_field"         android:imeoptions="actiondone"         android:inputtype="text"         android:padding="10dip" />      <relativelayout         android:id="@+id/correctanswerlayoutcontainer"         android:layout_width="fill_parent"         android:layout_height="0dp"         android:layout_below="@id/moviename"         android:layout_marginleft="10dip"         android:layout_marginright="10dip"         android:layout_weight="1"         android:background="@drawable/circular_rectangle_white_background"         android:paddingleft="10dip"         android:visibility="gone" >          <linearlayout             android:id="@+id/hintcontainer"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:layout_margintop="5dip"             android:orientation="vertical" >              <linearlayout                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:gravity="center_vertical"                 android:orientation="horizontal" >                  <imageview                     android:layout_width="40dp"                     android:layout_height="35dp"                     android:src="@drawable/icon" />                  <textview                     android:id="@+id/hintone"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:layout_gravity="center_vertical"                     android:text="@string/musical_moview_text"                     android:textappearance="?android:attr/textappearancemedium"                     android:textcolor="@android:color/black"                     android:textsize="15dp" />             </linearlayout>              <linearlayout                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:layout_margintop="5dip"                 android:gravity="center_vertical"                 android:orientation="horizontal" >                  <imageview                     android:layout_width="40dp"                     android:layout_height="35dp"                     android:src="@drawable/icon" />                  <textview                     android:id="@+id/hinttwo"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:layout_gravity="center_vertical"                     android:text="@string/release_text"                     android:textappearance="?android:attr/textappearancemedium"                     android:textcolor="@android:color/black"                     android:textsize="15dp" />             </linearlayout>              <linearlayout                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:layout_marginbottom="5dip"                 android:layout_margintop="5dip"                 android:gravity="center_vertical"                 android:orientation="horizontal" >                  <imageview                     android:layout_width="40dp"                     android:layout_height="35dp"                     android:src="@drawable/icon" />                  <textview                     android:id="@+id/hintthree"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:layout_gravity="center_vertical"                     android:text="@string/hint3_text"                     android:textappearance="?android:attr/textappearancemedium"                     android:textcolor="@android:color/black"                     android:textsize="15dp" />             </linearlayout>         </linearlayout>     </relativelayout>      <button         android:id="@+id/nextbutton"         android:layout_width="wrap_content"         android:layout_height="0dp"         android:layout_gravity="center_horizontal"         android:layout_marginbottom="5dp"         android:layout_margintop="5dip"         android:layout_weight="1"         android:background="@drawable/next_btn" />      <linearlayout         android:layout_width="fill_parent"         android:layout_height="0dp"         android:orientation="vertical"         android:layout_weight="1" >          <com.google.ads.adview             android:id="@+id/adview"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             ads:adsize="banner"             ads:adunitid="@string/publisher_id"             ads:loadadoncreate="true" />     </linearlayout>  </linearlayout> 

try this..

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"     android:id="@+id/linearmainlayout"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical" >      <linearlayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_weight="1"         android:orientation="vertical"         android:weightsum="10" >          <linearlayout             android:id="@+id/linear1"             android:layout_width="match_parent"             android:layout_height="0dp"             android:layout_weight="4"             android:orientation="horizontal"             android:paddingbottom="10dip"             android:paddingtop="5dip"             android:weightsum="100" >              <linearlayout                 android:layout_width="0dip"                 android:layout_height="match_parent"                 android:layout_weight="20"                 android:gravity="center_vertical"                 android:orientation="vertical" >                  <button                     android:id="@+id/fbshare"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:layout_gravity="center_horizontal"                     android:textappearance="?android:attr/textappearancesmall" />                  <button                     android:id="@+id/twittershare"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:layout_gravity="center_horizontal"                     android:textappearance="?android:attr/textappearancesmall" />                  <button                     android:id="@+id/revealbutton"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:layout_gravity="center_horizontal"                     android:textappearance="?android:attr/textappearancesmall" />             </linearlayout>              <relativelayout                 android:id="@+id/imagecontainer"                 android:layout_width="0dip"                 android:layout_height="wrap_content"                 android:layout_gravity="center_vertical|center_horizontal"                 android:layout_marginright="10dip"                 android:layout_margintop="3dp"                 android:layout_weight="60"                 android:orientation="vertical" >                  <relativelayout                     android:id="@+id/imageview"                     android:layout_width="320dip"                     android:layout_height="150dip"                     android:layout_centerhorizontal="true"                     android:layout_centervertical="true" >                      <imageview                         android:id="@+id/correctmark"                         android:layout_width="80dip"                         android:layout_height="80dip"                         android:layout_alignparentbottom="true"                         android:layout_alignparentleft="true"                         android:layout_marginbottom="10dip"                         android:layout_marginleft="5dip"                         android:src="@drawable/ic_launcher"                         android:visibility="gone" />                 </relativelayout>             </relativelayout>              <linearlayout                 android:id="@+id/ticketcountercontainer"                 android:layout_width="0dip"                 android:layout_height="match_parent"                 android:layout_weight="20"                 android:gravity="center_vertical"                 android:orientation="vertical" >                  <button                     android:id="@+id/ticket1"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:textappearance="?android:attr/textappearancesmall" />                  <button                     android:id="@+id/ticket2"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:textappearance="?android:attr/textappearancesmall" />                  <button                     android:id="@+id/ticket3"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:textappearance="?android:attr/textappearancesmall" />             </linearlayout>         </linearlayout>          <edittext             android:id="@+id/moviename"             android:layout_width="match_parent"             android:layout_height="0dp"             android:layout_below="@+id/linear1"             android:layout_marginleft="10dip"             android:layout_marginright="10dip"             android:layout_weight="1"             android:imeoptions="actiondone"             android:inputtype="text"             android:padding="10dip" />          <relativelayout             android:id="@+id/correctanswerlayoutcontainer"             android:layout_width="fill_parent"             android:layout_height="0dp"             android:layout_below="@+id/moviename"             android:layout_marginleft="10dip"             android:layout_marginright="10dip"             android:layout_weight="1"             android:paddingleft="10dip"             android:visibility="gone" >              <linearlayout                 android:id="@+id/hintcontainer"                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:layout_margintop="5dip"                 android:orientation="vertical" >                  <linearlayout                     android:layout_width="match_parent"                     android:layout_height="wrap_content"                     android:gravity="center_vertical"                     android:orientation="horizontal" >                      <imageview                         android:layout_width="40dp"                         android:layout_height="35dp"                         android:src="@drawable/ic_launcher" />                      <textview                         android:id="@+id/hintone"                         android:layout_width="wrap_content"                         android:layout_height="wrap_content"                         android:layout_gravity="center_vertical"                         android:text="musical_moview_text"                         android:textappearance="?android:attr/textappearancemedium"                         android:textcolor="@android:color/black"                         android:textsize="15dp" />                 </linearlayout>                  <linearlayout                     android:layout_width="match_parent"                     android:layout_height="wrap_content"                     android:layout_margintop="5dip"                     android:gravity="center_vertical"                     android:orientation="horizontal" >                      <imageview                         android:layout_width="40dp"                         android:layout_height="35dp"                         android:src="@drawable/ic_launcher" />                      <textview                         android:id="@+id/hinttwo"                         android:layout_width="wrap_content"                         android:layout_height="wrap_content"                         android:layout_gravity="center_vertical"                         android:text="release_text"                         android:textappearance="?android:attr/textappearancemedium"                         android:textcolor="@android:color/black"                         android:textsize="15dp" />                 </linearlayout>                  <linearlayout                     android:layout_width="match_parent"                     android:layout_height="wrap_content"                     android:layout_marginbottom="5dip"                     android:layout_margintop="5dip"                     android:gravity="center_vertical"                     android:orientation="horizontal" >                      <imageview                         android:layout_width="40dp"                         android:layout_height="35dp"                         android:src="@drawable/ic_launcher" />                      <textview                         android:id="@+id/hintthree"                         android:layout_width="wrap_content"                         android:layout_height="wrap_content"                         android:layout_gravity="center_vertical"                         android:text="hint3_text"                         android:textappearance="?android:attr/textappearancemedium"                         android:textcolor="@android:color/black"                         android:textsize="15dp" />                 </linearlayout>             </linearlayout>         </relativelayout>          <button             android:id="@+id/nextbutton"             android:layout_width="wrap_content"             android:layout_height="0dp"             android:layout_gravity="center_horizontal"             android:layout_marginbottom="5dp"             android:layout_margintop="5dip"             android:layout_weight="1" />     </linearlayout>      <linearlayout         android:layout_width="fill_parent"         android:layout_height="55dp"         android:orientation="vertical" >          <com.google.ads.adview             android:id="@+id/adview"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             ads:adsize="banner"             ads:adunitid="@string/publisher_id"             ads:loadadoncreate="true" />     </linearlayout>  </linearlayout>