webview in layout with 4 textviews in top

I do not have much experience with screen layouts xml. I would like to show my screen like this: http://ift.tt/1uOGs3k

PS: I would add textvies label3 and Label4 (in red). they are in the figure, but are not in the xml, because I could not aligning them.

Would help to fit these two textviews in my layout below:

  <?xml version="1.0" encoding="utf-8"?>
  <RelativeLayout xmlns:android="http://ift.tt/nIICcg"
     android:layout_width="fill_parent"
     android:theme="@android:style/Theme.Dialog"
     android:layout_height="fill_parent" >

    <WebView
        android:id="@+id/id_web_view_browser"
        android:layout_above="@+id/id_web_view_bar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" />

    <RelativeLayout
        android:id="@+id/id_web_view_bar"
        android:layout_width="fill_parent"
        android:layout_height="40dp"
        android:layout_alignParentBottom="true"
        android:background="#ffffff"
        android:orientation="vertical" >
        <Button
            android:id="@+id/btnCancelar"
            android:background="@drawable/btn_red"
            android:layout_width="fill_parent"
            android:layout_centerHorizontal="true"
            android:layout_height="wrap_content"
            android:text="     Cancelar Corrida      "
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:textSize="20sp" />

    </RelativeLayout>

<RelativeLayout
            android:id="@+id/relativeLayout1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:gravity="top">
            <TextView 
                android:id="@+id/txtLabel1"
                android:layout_alignParentLeft="true"
                android:layout_height="wrap_content"
                android:background="#ffffff"
                android:maxLines="1"
                android:layout_width="wrap_content"
                android:text="Label1: Sample1">
            </TextView>
            <TextView
                android:id="@+id/txtLabel2"
                android:layout_alignParentRight="true"
                android:layout_height="wrap_content"
                android:layout_width="wrap_content"
                android:background="#ffffff"
                android:text="Label2: Sample2">
            </TextView>

</RelativeLayout>

</RelativeLayout>