[android-developers] using getSurfaceFrame to get display width/height?

So I'm trying out making a live wallpaper and I'm using the sample
code provided in the SDK for the cube live wallpaper

I wanted to use this code to get the height/width of the display

@Override
public void onCreate(SurfaceHolder surfaceHolder) {
super.onCreate(surfaceHolder);

Rect frame = getSurfaceHolder().getSurfaceFrame();
float width = frame.width();
float height = frame.height();
// By default, we don't get touch events, so enable them.
setTouchEventsEnabled(true);
}

Unfortunately, when I run this code, the width and height return as 0,
though if I put this in onVisibilityChanged, the correct values are
returned, why is this and is it suitable to move the code to
onVisibilityChanged?

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