How to expand SearchView attached to a view?

Question

I want the default view of searchview in expanded form, placed inside layout file.

my code...

layout file:

 <android.support.v7.widget.SearchView

            android:id="@+id/search_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBottom="@id/rel2"
            android:layout_alignTop="@id/rel2"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:textSize="16sp" />

Java src:

search_view.setIconifiedByDefault(false);

There is other option like: this one and this one

both dosen't work for me.