android - how to set custom Y-labels in MPAndroid chart -

i use mpandroid chart present values in time (the performance of users). code prepared chart data is:

            barchart chart = (barchart) rootview.findviewbyid(r.id.chart);              arraylist<barentry> enteries = new arraylist<>();             arraylist<string> labels = new arraylist<>();             (int = 0; < data.length; i++) {                 enteries.add(new barentry(data[i].getvalue(), i));                 labels.add(data[i].getname());             }             bardataset dataset = new bardataset(enteries, "");              int[] clr = new int[]{color.red, color.red, color.red, color.rgb(0xff, 0xff, 0x00), color.blue, color.black};             dataset.setcolors(clr);             chart.setdata(new bardata(labels, dataset));             chart.animatey(500); 

values in 'data' in 'seconds'.
how can show values both in y-labels , above bars in hhhh:mm:ss format, i.e. 1:40 (1 minute , 40 seconds) instead of 100.

edit1:
solved problem of y-lables defining custom yaxisvalueformatter class:

    public class myyaxisvalueformatter implements yaxisvalueformatter{         public myyaxisvalueformatter () {         }          @override         public string getformattedvalue(float value, yaxis yaxis) {             string ylabel="";             int h=(int)(value/3600);             int m=(int)((value%3600)/60);             int s=(int)(value%60);             if(h>0)                 ylabel=ylabel+integer.tostring(h)+":";             if(m>0)                 ylabel=ylabel+integer.tostring(m)+":";             ylabel=ylabel+integer.tostring(s);             return ylabel;         }     } 

but couldn't find way change format of values above bars yet!