Android - flex space between views

some_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout android:id="@+id/activity_webview_toolbar"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:orientation="horizontal"
        android:layout_alignParentBottom="true"
        android:background="#FF0000">
        
        <Button android:id="@+id/activity_webview_btn_back"
	        android:layout_width="30dp"
	        android:layout_height="30dp"
	        android:layout_margin="10dp"
	        android:background="@drawable/circle_west" />
        
        <!-- This view with weight 1 as a flex space to evenly space out other views -->
        <View android:layout_width="wrap_content"
	        android:layout_height="wrap_content"
	        android:layout_weight="1" />
        
        <Button android:id="@+id/activity_webview_btn_refresh"
	        android:layout_width="30dp"
	        android:layout_height="30dp"
	        android:layout_margin="10dp"
	        android:background="@drawable/refresh" />
        
        <!-- This view with weight 1 as a flex space to evenly space out other views -->
        <View android:layout_width="wrap_content"
	        android:layout_height="wrap_content"
	        android:layout_weight="1" />
        
        <Button android:id="@+id/activity_webview_btn_forward"
	        android:layout_width="30dp"
	        android:layout_height="30dp"
	        android:layout_margin="10dp"
	        android:background="@drawable/circle_east" />
        
    </LinearLayout>
    
    <WebView android:id="@+id/activity_webview_webview"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_above="@id/activity_webview_toolbar"/>

</RelativeLayout>