public void setOnValueTouchListener(ComboLineColumnChartOnValueSelectListener touchListener) {
        if (null != touchListener) {
            this.onValueTouchListener = touchListener;
        }
    }
ComboChart, supports ColumnChart combined with LineChart. Lines are always drawn on top.

@author Leszek Wach
hellocharts-library/src/lecho/lib/hellocharts/view/ComboLineColumnChartView.java