MPAndroidChart BarChart Grouped Data

Question

I am using the MPAndroidChart release v2 library . I am trying to show 3 bars with data taken from a database. Unfortunately, instead of seeing 3 bars with their data, looking at them with the same result. See screenshot. Thank you for your help.

int [] x = {1,2,3}; Cursor c = db.rawQuery(sql, null); int count = c.getCount(); float value1 ; float value2 ; float value3 ; String[] mesi = new String[count]; for(int n=0; n<count; n++) { c.moveToNext(); mesi[n]= c.getString(0); value1 = c.getFloat(1); value2 = c.getFloat(2); value3 = c.getFloat(3); ArrayList<String> xVals = new ArrayList<String>(); for (int i = 0; i <x.length; i++) { xVals.add(x.length + " " + mChart.getUnit()); } ArrayList<BarEntry> yVals1 = new ArrayList<BarEntry>(); ArrayList<BarEntry> yVals2 = new ArrayList<BarEntry>(); ArrayList<BarEntry> yVals3 = new ArrayList<BarEntry>(); for (int i = 0; i < x.length; i++) { yVals1.add(new BarEntry(value1, i)); } for (int i = 0; i < x.length; i++) { yVals2.add(new BarEntry(value2, i)); } for (int i = 0; i < x.length; i++) { yVals3.add(new BarEntry(value3, i)); } // create 3 datasets with different types BarDataSet set1 = new BarDataSet(yVals1, "Company A"); set1.setColor(Color.rgb(104, 241, 175)); BarDataSet set2 = new BarDataSet(yVals2, "Company B"); set2.setColor(Color.rgb(164, 228, 251)); BarDataSet set3 = new BarDataSet(yVals3, "Company C"); set3.setColor(Color.rgb(242, 247, 158)); ArrayList<BarDataSet> dataSets = new ArrayList<BarDataSet>(); dataSets.add(set1); dataSets.add(set2); dataSets.add(set3); BarData data = new BarData(xVals, dataSets); // add space between the dataset groups in percent of bar-width data.setGroupSpace(0); mChart.setData(data); mChart.invalidate(); } c.close(); db.close(); } 

result

Answer 1

Have you drawn the logcat values ​​that the chart should display? They may not be stored correctly in the database.

Your code seems correct to me.

You can also check it by simply providing a predefined value, for example, for example. 50 for all the bars and see if it is built correctly.

To change the color call:

BarDataSet.setColor(...);

UPDATE . There is currently a very detailed guide to creating grouped BarCharts , available on the official GitHub page of the library, based on version v3.0.0: Group training on BarChart