Here is my Xml file
  <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/popup"
        android:layout_width="fill_parent"
        android:layout_height="350dip" >
        <RelativeLayout
            android:id="@+id/rl_top"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:background="#00000000" >
            <ImageView
                android:id="@+id/image_tringle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_alignParentTop="true"
                android:layout_marginRight="50dp"
                android:src="@drawable/notficationarrow_icon" />
        </RelativeLayout>
        <ListView
            android:id="@+id/listView1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_below="@id/textView1"
            android:background="#ffffff" >
        </ListView>
        <TextView
            android:id="@+id/notficationbglayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_below="@+id/rl_top"
            android:background="#ffffff"
            android:gravity="center"
             style="@style/AudioFileInfoOverlayText"
            android:text="Notification"
            android:textColor="#666666"
            android:textSize="25dip"
            android:textStyle="bold" />
    </RelativeLayout>

i have tried much but unable to apply set Shadow effect please help .
i want set shadow effect on Textview where i have written Notification so its look like face book

i want make it like facebook please help and suggest how to apply Shadow effect