[android-developers] "Lights Out" mode

I am trying (unsuccessfully thus far) to dim the system bar on
Honeycomb devices. My current layout contains a single WebView. The
following is called in my bundle's onCreate routine.

setContentView(R.layout.main);
mWebView = (WebView) findViewById(R.id.webview);
if (android.os.Build.VERSION.SDK_INT >=
android.os.Build.VERSION_CODES.HONEYCOMB){
mWebView.setSystemUiVisibility(View.STATUS_BAR_HIDDEN);
}

The function is getting called, but the system bar is never dimmed.
What am I missing here?
Thanks in advance.

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