Question

I’m using AChartEngine to display averages across several days (2 months if possible). I’d like to provide a comparison between one individual and a group. At this point, I’m working on how to provide dates across the x-axis (ie, 12/15/2011 or Dec. 11, 2011 or even 12/15, Dec. 15).

I’m not sure how to do this in AchartEngine; the documentation is a little hard for me to follow without pictures (sorry). I’d like something like this: Using AChartEngine library for graphs, not able to get value for diffrent x-axis value

Here’s my code:

private void setupHistoryChart() {    
        XYMultipleSeriesRenderer renderer = getBarDemoRenderer();
        setChartSettings(renderer);
        Intent intent = ChartFactory.getBarChartIntent(this, getBarDemoDataset(), renderer, Type.DEFAULT);
        startActivity(intent);
    }

     public XYMultipleSeriesRenderer getBarDemoRenderer() {
         XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();
         renderer.setAxisTitleTextSize(15);
         renderer.setChartTitleTextSize(18);
         renderer.setLabelsTextSize(12);
         renderer.setLegendTextSize(15);
         renderer.setMargins(new int[] {20, 30, 15, 0});
         SimpleSeriesRenderer r = new SimpleSeriesRenderer();
         r.setColor(Color.BLUE);
         renderer.addSeriesRenderer(r);

         return renderer;
       }

     private void setChartSettings(XYMultipleSeriesRenderer renderer) {   
         renderer.setChartTitle("History");
         renderer.setChartTitleTextSize((float) 14.0);
         renderer.setXTitle("Day");
         renderer.setXLabelsAlign(Align.LEFT);
         renderer.setYLabelsAlign(Align.LEFT);
         renderer.setBarSpacing(0.5);
         renderer.setZoomEnabled(true);
         renderer.setZoomRate(0.2f);
         renderer.setYTitle("Unit)");
         renderer.setXAxisMin(1.0);

         if(AppStatus.mDayMap.size() == 0){
             renderer.setXAxisMax(3.0);
             renderer.setYAxisMax(10.0);
         }else{
             renderer.setXAxisMax(AppStatus.mDayMap.size());
             // Get the max Integer out of myMap
             Map.Entry<String, Integer> maxEntry = null;

             for (Map.Entry<String, Integer> entry : AppStatus.mDayMap.entrySet())
             {
                 if (maxEntry == null || entry.getValue().compareTo(maxEntry.getValue()) > 0)
                 {
                     maxEntry = entry;
                 }
             }
             renderer.setYAxisMax(maxEntry.getValue()/1000 + maxEntry.getValue()/1000);
         }
         renderer.setYAxisMin(0);
       }

     private XYMultipleSeriesDataset getBarDemoDataset() {
         XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
         HashMap<String, Integer> myMap = AppStatus.mDayMap;
         CategorySeries series = new CategorySeries ("Your History " + 1);
         try{

             if(AppStatus.mDayMap.size() == 0){
                 series.add(3.0);
                 series.add(10.0);
                 dataset.addSeries(series.toXYSeries());
             }else{
                 Log.v(LOG_TAG, "Size of Map = " + myMap.size());
                 float sum = (float) 0.0;
                 if(myMap.size() > 0){
                     Iterator it = myMap.entrySet().iterator();
                     float j= (float)0.0;
                     for (int i = 0; i < 1 /*2*/; i++) {
                       //CategorySeries series = new CategorySeries("Your History " + (i + 1));
                       while(it.hasNext()){
                           Map.Entry pairs = (Map.Entry)it.next();
                           sum = sum + (float) (1.0 + j);
                           series.add((((Integer) pairs.getValue()).doubleValue())/1000); 
                       }
                       dataset.addSeries(series.toXYSeries());
                     }
                 }
             }

         }catch(IllegalArgumentException e){
             Log.e(LOG_TAG, "IllegalArgumentException " + e.toString());
             series.add(3.0);
             series.add(10.0);
             dataset.addSeries(series.toXYSeries());
         }

         return dataset;
       }

Answer 1

You can set custom text for the X axis labels:

renderer.addXTextLabel(x, text);
renderer.setXLabels(0);

In order to have multiple color bars in the bar chart, you will have to add multiple series.

There are some instructions here on how to download and run the demo application which includes a lot of good code to demonstrate the AChartEngine usage.