public PieChartData setCenterCircleColor(int centerCircleColor) {
        this.centerCircleColor = centerCircleColor;
        return this;
    }
Set if labels should be drawn inside circle(false) or outside(true). By default false. If you set it to true you
should also change chart fill ration using {@link PieChartView#setCircleFillRatio(float)}. This flag is used only
if you also set hasLabels or hasLabelsOnlyForSelected flags.
hellocharts-library/src/lecho/lib/hellocharts/model/PieChartData.java