How to create a BarChart with grouped bars with MPAndroidChart?

Question

How can i compare two set of data using BarChart of MPAndroidChart.

It should look like this image below:

I edited a code, I get from a sample project in github. how can I put together 100f and 110f value in one Xaxis label Whole Number

        Score score1 = new Score(100f, 0, "Whole Number");         mRealm.copyToRealm(score1);         Score score2 = new Score(110f, 0, "Whole Number");         mRealm.copyToRealm(score2); 

Answer 1

Since there has been an update on BarData constructor you need to use following code:

BarChart barChart = (BarChart) view.findViewById(R.id.chart); barChart.setDrawBarShadow(false); barChart.setDrawValueAboveBar(true); barChart.setDescription(""); barChart.setMaxVisibleValueCount(50); barChart.setPinchZoom(false); barChart.setDrawGridBackground(false);  XAxis xl = barChart.getXAxis(); xl.setGranularity(1f); xl.setCenterAxisLabels(true); xl.setValueFormatter(new AxisValueFormatter() {     @Override     public String getFormattedValue(float value, AxisBase axis) {         return String.valueOf((int) value);     }      @Override     public int getDecimalDigits() {         return 0;     } });  YAxis leftAxis = barChart.getAxisLeft(); leftAxis.setValueFormatter(new AxisValueFormatter() {     @Override     public String getFormattedValue(float value, AxisBase axis) {         return String.valueOf((int) value);     }      @Override     public int getDecimalDigits() {         return 0;     } }); leftAxis.setDrawGridLines(false); leftAxis.setSpaceTop(30f); leftAxis.setAxisMinValue(0f); // this replaces setStartAtZero(true barChart.getAxisRight().setEnabled(false);  //data float groupSpace = 0.04f; float barSpace = 0.02f; // x2 dataset float barWidth = 0.46f; // x2 dataset // (0.46 + 0.02) * 2 + 0.04 = 1.00 -> interval per "group"  int startYear = 1980; int endYear = 1985; List<BarEntry> yVals1 = new ArrayList<BarEntry>();  List<BarEntry> yVals2 = new ArrayList<BarEntry>();  for (int i = startYear; i < endYear; i++) {     yVals1.add(new BarEntry(i, 0.4f));     yVals2.add(new BarEntry(i, 0.7f)); }  BarDataSet set1, set2; if (barChart.getData() != null && barChart.getData().getDataSetCount() > 0) {     set1 = (BarDataSet)barChart.getData().getDataSetByIndex(0);     set2 = (BarDataSet)barChart.getData().getDataSetByIndex(1);     set1.setValues(yVals1);     set2.setValues(yVals2);     barChart.getData().notifyDataChanged();     barChart.notifyDataSetChanged(); } else {     // create 2 datasets with different types     set1 = new BarDataSet(yVals1, "Company A");     set1.setColor(Color.rgb(104, 241, 175));     set2 = new BarDataSet(yVals2, "Company B");     set2.setColor(Color.rgb(164, 228, 251));     ArrayList<IBarDataSet> dataSets = new ArrayList<IBarDataSet>();     dataSets.add(set1);     dataSets.add(set2);     BarData data = new BarData(dataSets);     barChart.setData(data); }  barChart.getBarData().setBarWidth(barWidth); barChart.getXAxis().setAxisMinValue(startYear); barChart.groupBars(startYear, groupSpace, barSpace); barChart.invalidate(); 

That's how it will look like:

Answer 2

Yes, that can be done quite easily.

What you need is a BarChart with multiple BarDataSets where each set (in your case) represents one sex (men or women).

• Here is an example of how to create a BarChart with multiple DataSets
• Here is an tutorial of how to use MPAndroidChart with Realm.io

Example code (without realm.io)

    List<String> xValues = ...; // "Denmark", "Finland", ...      XAxis xAxis = chart.getXAxis();     xAxis.setValueFormatter(new MyValueFormatter(xValues));      // create 2 datasets      BarDataSet set1 = new BarDataSet(valuesMen, "Men");     set1.setColor(Color.BLUE);     BarDataSet set2 = new BarDataSet(valuesWomen, "Women");     set2.setColor(Color.RED);      BarData data = new BarData(set1, set2);     chart.setData(data);     chart.groupBars(...); // available since release v3.0.0     chart.invalidate(); // refresh 

If you need further assistance, here is a detailed tutorial on grouped BarChart available on the wiki.

If you want to "stack" values in a BarChart above each other, you need to create a stacked-barchart: Android Stacked Bars Chart