layout - Android: Adding elevation to a widget -

i trying add elevation widget layout. placed android:elevation in root layout, tried putting in child relative layout also.

<relativelayout     android:id="@+id/main_layout"     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"     android:background="@drawable/widget_background"     android:elevation="30dp">      <relativelayout         android:id="@+id/widget_bad_data_text"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:visibility="visible">          <imageview             android:id="@+id/widget_no_data_icon"             android:layout_width="@dimen/widget_1x1_icon_width_height"             android:layout_height="@dimen/widget_1x1_icon_width_height"             android:layout_centerhorizontal="true"             android:layout_margintop="@dimen/widget_1x1_margin_top"/>          <textview             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_below="@id/widget_no_data_icon"             android:text="@string/widget"             android:layout_centerhorizontal="true"             android:fontfamily="sans-serif-light"             android:textcolor="@android:color/white"             android:textsize="@dimen/widget_1x1"             tools:ignore="unusedattribute,spusage" />      </relativelayout>  </relativelayout> 

you're adding elevation base container. able see elevation effect, set margin 30dp.