Android WebView shows a blank page

Trying to create a WebView but it only shows a blank/white page. I have followed several examples and they all say that work with this code...

Here is my code:

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;

public class PostenWebView extends Activity {

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.web_view);
        WebView webview = (WebView)findViewById(R.id.webview);
        webview.loadUrl("http://www.google.com");
    }
}

And here is the web_view.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">
    <WebView 
        android:id="@+id/webview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
    />
</LinearLayout>