I have created a spinner which looks like

My layout file is:
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/round_corners"
android:padding="7dip" >
<Spinner
android:id="@+id/select_city"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:prompt="@string/selectCity" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="14dp"
android:text="@string/City"
android:textColor="@color/dark_grey"
android:textSize="18dp" />
</RelativeLayout>
What I want is to make the background of the spinner transparent but still show the downward arrow. Is there any way that I can do this?
Create xml file and place it in drawable folder.
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For more Information Check this Change Spinner Style In Android