Android : Android: Squared Diamond Drawable

I'm trying to create a drawable to use as a view background that consists of a single squared diamond centered. I've been playing with trying to create a square and rotating it 45 degrees, but it's not really working out as I'd expect. I was wondering if anyone has any suggestions or a working example that they could offer up to help me out. I've tried making this in XML, and recently switched to trying it in Java, like so:

public class DiamondView extends Drawable {

private Paint paint;

public DiamondView() {
    paint = new Paint();
    paint.setAntiAlias(true);
}

@Override
public void draw(Canvas canvas) {

    int height = getBounds().height();
    int width = getBounds().width();

    RectF rect = new RectF( 0.0f, 0.0f, height / 2, height / 2 );

    canvas.rotate( 45 );
    canvas.translate( width / 4, 0 );
    canvas.drawRect( rect, paint );


}

@Override
public void setAlpha(int alpha) {
    paint.setAlpha(alpha);
}

@Override
public void setColorFilter(ColorFilter cf) {
    paint.setColorFilter(cf);
}

@Override
public int getOpacity() {
    return PixelFormat.TRANSLUCENT;
}

}