Question

I’m trying to add data (floats specifically) to a bar chart I’m creating with achartengine. I’ve created a HashMap to hold keys/values but I’m not able to access the actual value of the Integer (i.e., Integer.valueOf). See below:

    private XYMultipleSeriesDataset getBarDemoDataset() {
       XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
       HashMap<String, Integer> myMap = AppStatus.mDayMap;
       Iterator it = myMap.entrySet().iterator();
       for (int i = 0; i < 1; i++) {
          CategorySeries series = new CategorySeries("Demo series " + (i + 1));
          while(it.hasNext()){
             Map.Entry pairs = (Map.Entry)it.next();
             // I should be able to code pairs.getValue().valueOf() but I get an error - the value seems to be a string below.
             series.add((Double)pairs.getValue()); 
          }

      dataset.addSeries(series.toXYSeries());
   }
   return dataset;
}

Answer 1

Integer i = 42;
double d = i.doubleValue();

So:

while (it.hasNext()) {
    Map.Entry entry = (Map.Entry) it.next();
    series.add(entry.getValue().doubleValue()); 
}

Although I would have thought that a series chart should be ordered, which would not be the case when iterating over a HashMap.