achartengine如何设置某一个柱状图柱子的颜色

请输入代码private double[] y;
    XYMultipleSeriesRenderer renderer;
    public BarChart(double[] y){
        this.y = y;
    }
     /**
       * Returns the chart name.
       * 
       * @return the chart name
       */
      public String getName() {
        return "Sales stacked bar chart";
      }

      /**
       * Returns the chart description.
       * 
       * @return the chart description
       */
      public String getDesc() {
        return "The monthly sales for the last 2 years (stacked bar chart)";
      }

      /**
       * 自定义X轴坐标；单柱状图
       * Executes the chart demo.
       * 
       * @param context the context
       * @return the built intent
       */
      public GraphicalView execute(Context context) {
        String[] titles = new String[] { "今日数据" };
        //增加横坐标x
        List<double[]> x = new ArrayList<double[]>();
                            
        x.add(new double[] { 1, 2, 3, 4, 5 });
        
        List<double[]> values = new ArrayList<double[]>();
        
        values.add(y);
        for (int i = 0; i < y.length; i++) {
            if(y[i]<50){
                int[] colors = new int[] { Color.CYAN };
                renderer = buildBarRenderer(colors);
            }else{
                int[] colors = new int[] { Color.RED };
                renderer = buildBarRenderer(colors);
            }  
        }
        setChartSettings(renderer, "LNG车载气瓶参数",
                "X", "Y", 0.5, 12.5, 0, 100, Color.GRAY,
                Color.LTGRAY);     
        renderer.getSeriesRendererAt(0).setDisplayChartValues(true);
        renderer.getSeriesRendererAt(0).setChartValuesTextSize(20);
        //自定义X轴的字符串标签
        String[] test = {"液位","压力","气耗量","真空度","加气次数"};
        for(int i=0;i<5;i++){
            renderer.addXTextLabel(i+1, test[i]);
        }
        
        //如果想要在X轴显示自定义的标签，那么首先要设置renderer.setXLabels(0);  
        //如果不设置为0，那么所设置的Labels会与原X坐标轴labels重叠
        renderer.setXLabels(0);
        renderer.setYLabels(10);
        renderer.setXLabelsAlign(Align.LEFT);
        renderer.setYLabelsAlign(Align.LEFT);
        renderer.setPanEnabled(false, false);
        renderer.setZoomRate(1.1f);
        renderer.setBarSpacing(0.5f);
        // 设置条形图之间的距离
        renderer.setBarSpacing(-5);
        renderer.setBarWidth(70);
        renderer.setInScroll(false);
        renderer.setPanEnabled(false, false);
        renderer.setClickEnabled(false);
        //设置x轴和y轴标签的颜色
        renderer.setXLabelsColor(Color.RED);
        renderer.setYLabelsColor(0,Color.RED);
        renderer.setLabelsTextSize(20);
        //设置图标的标题
        renderer.setChartTitleTextSize(40);
        renderer.setLabelsColor(Color.RED);
        //设置图例的字体大小
        renderer.setLegendTextSize(30);
        
        XYMultipleSeriesDataset dataset = buildDataset(titles, x, values);
        //返回GraphicalView,可以灵活设置也可以仅作为一部分显示在任何activity上.
        return ChartFactory.getBarChartView(context, dataset, renderer, Type.STACKED);
      }

    }