Consultation about draw graph on android
===

i got this code for drawing a graph

    public class FuelChart {
    
    	private static final String DATE_FORMAT = "dd/MM/yyyy";
    
    	public GraphicalView getView(Context context, List<Result> results) {
    		String title = "5555555";
    
    		int[] colors = new int[] { Color.GREEN };
    		PointStyle[] styles = new PointStyle[] { PointStyle.POINT};
    		XYMultipleSeriesRenderer renderer = buildRenderer(colors, styles);
    
    		Result max = Collections.max(results);
    		Result min = Collections.min(results);
    
    		setChartSettings(renderer, "dddd",
    				"3333",
    				"44444", results.get(0)
    						.getDate().getTime(), results.get(results.size() - 1)
    						.getDate().getTime(), min.getValue(), max.getValue(), Color.GRAY, Color.LTGRAY);
    		renderer.setXLabels(5);//5
    		renderer.setYLabels(10);//10
    		SimpleSeriesRenderer seriesRenderer = renderer.getSeriesRendererAt(0);
    		seriesRenderer.setDisplayChartValues(true);
    
    		return ChartFactory.getTimeChartView(context,
    				buildDateDataset(title, results), renderer, DATE_FORMAT);
    	}
    
    	protected void setChartSettings(XYMultipleSeriesRenderer renderer,
    			String title, String xTitle, String yTitle, double xMin,
    			double xMax, double yMin, double yMax, int axesColor,
    			int labelsColor) {
    		renderer.setChartTitle(title);
    		renderer.setXTitle(xTitle);
    		renderer.setYTitle(yTitle);
    		renderer.setXAxisMin(xMin);
    		renderer.setXAxisMax(xMax);
    		renderer.setYAxisMin(yMin);
    		renderer.setYAxisMax(yMax);
    		renderer.setAxesColor(axesColor);
    		renderer.setLabelsColor(labelsColor);
    	}
    
    	protected XYMultipleSeriesRenderer buildRenderer(int[] colors,
    			PointStyle[] styles) {
    		XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();
    		setRendererProperties(renderer, colors, styles);
    		return renderer;
    	}
    
    	protected XYMultipleSeriesDataset buildDateDataset(String title,
    			List<Result> results) {
    		XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
    		TimeSeries series = new TimeSeries(title);
    		for (Result result : results) {
    			series.add(result.getDate(), result.getValue());
    		}
    		dataset.addSeries(series);
    		return dataset;
    	}
    
    	protected void setRendererProperties(XYMultipleSeriesRenderer renderer, int[] colors,
    			PointStyle[] styles) {
    		renderer.setAxisTitleTextSize(16);
    		renderer.setChartTitleTextSize(20);
    		renderer.setLabelsTextSize(15);
    		renderer.setLegendTextSize(15);
    		renderer.setPointSize(5f);//5
    		renderer.setMargins(new int[] { 20, 30, 15, 20 });
    		int length = colors.length;
    		for (int i = 0; i < length; i++) {
    			XYSeriesRenderer r = new XYSeriesRenderer();
    			r.setColor(colors[i]);
    			r.setPointStyle(styles[i]);
    			renderer.addSeriesRenderer(r);
    		}
    	}


    public class GraphTestActivity extends Activity {
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            FuelChart chart = new FuelChart();
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
            setContentView(chart.getView(this, getResults()));
        }
        private List<Result> getResults() {
        	        List<Result> results = new ArrayList<Result>();
        	        results.add(new Result(new Date(108, 9, 1), 18.8));
        	        results.add(new Result(new Date(108, 9, 8), 19.0));
        	        results.add(new Result(new Date(108, 9, 15), 10.0));
        	        results.add(new Result(new Date(108, 9, 22), 19.5));
        	        results.add(new Result(new Date(108, 9, 22), 39.5));
        	        results.add(new Result(new Date(108, 9, 22), 49.5));
        	        results.add(new Result(new Date(108, 9, 22), 19.5));
        	        return results;
        	    }


this sample draw only one graph, how i can draw more than one ?  what i need to add to this code ?

thanks in advance