Setting webview background image to a resource graphic in Android

I'm trying to set the background of a webview to a drawable image resource in Android.

From the sdk it seems something like this would work but it doesn't.

WebView web = (WebView) findViewById(R.id.webView);

web.setBackgroundResource(R.drawable.backgroundmain);
web.loadData(profile, "text/html", "UTF-8");

Any idea's?