MPAndroidChart Value formatter out of array range

Question

I wanna format XAxis values from int to String (actually date) the problem is that formatter is not stopping when ArrayList size is reached and I get out of array range exception. What can I do about this ?

    barEntries=new ArrayList <> (  );
    XAxisLabels=new ArrayList <> (  );
    barEntries.add ( new BarEntry ( 0,0 ) );
    XAxisLabels.add ( "2017-10-29 09:26:07" );
    barEntries.add ( new BarEntry ( 1,400 ) );
    XAxisLabels.add ( "2017-10-28 19:04:22" );
    barEntries.add ( new BarEntry ( 2,200 ) );
    XAxisLabels.add ( "2017-10-28 19:05:12" );
    barEntries.add ( new BarEntry ( 3,300 ) );
    XAxisLabels.add ( "2017-10-29 09:26:07" );

            BarDataSet barDataSet = new BarDataSet ( barEntries, "DataSet" );
            barDataSet.setColors ( ColorTemplate.COLORFUL_COLORS );

            BarData barData = new BarData ( barDataSet );

            XAxis xAxis = barChart.getXAxis ( );
            xAxis.setPosition ( XAxis.XAxisPosition.BOTH_SIDED );
            xAxis.setValueFormatter ( new MyXAxisValueFormatter ( XAxisLabels ) );
            //xAxis.setGranularity ( 1 );
            xAxis.setCenterAxisLabels ( true );
            //xAxis.setAxisMinimum ( 1 );
            barChart.setData ( barData );
            barChart.notifyDataSetChanged ( );
            barChart.invalidate ( );

My Formatter:

public class MyXAxisValueFormatter implements IAxisValueFormatter{
        int counter=0;
        private ArrayList <String> mValues = new ArrayList <> (  );
        public MyXAxisValueFormatter(ArrayList<String> values)
        {
            this.mValues=values;
        }
        @Override
        public String getFormattedValue ( float value, AxisBase axis ) {
            String x;
            value=value+counter*0.3f;
            counter++;
            x= mValues.get ( (int)value);
            return x;
        }
}

Application screenshot

Muhammad Saad Rafique · Accepted Answer · 2017-11-14 12:26:40Z

3

public class MyXAxisValueFormatter implements IAxisValueFormatter {
private List labels;

public MyXAxisValueFormatter(List<String> labels) {
    this.labels = labels;
}

@Override
public String getFormattedValue(float value, AxisBase axis) {
    try {
        int index = (int) value;
        return labels.get(index);
    } catch (Exception e) {
        return "";
    }
}
}

edited Nov 14, 2017 at 12:26

answered Nov 14, 2017 at 10:14

Muhammad Saad Rafique

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19 Comments

Muhammad Saad Rafique Over a year ago

It will work ... only check the conversion of float to string. This method will call automatically for each value you dont need to provide your arraylist. If it works please dont forget to mark this post as answer. Happy coding buddy :)

Krzysztof Skubała Over a year ago

But how it gonna know where are Strings that it needs to take to sign x axis ?

Muhammad Saad Rafique Over a year ago

Basically axis value formatter is called upon selected axis. So if you call it on specific axis it get values of all labels from there and convert them all one by one.

Muhammad Saad Rafique Over a year ago

Test this you may need to change the condition of string as I dont get in your logic that what you are doing by multiplying value with 3.0f. Give it a try it will covert all of your float values to strings of given axis.Thank you :)

Muhammad Saad Rafique Over a year ago

If you need further assistance you can text me anytime buddy :)

|

Victor Pozdnyakov · Accepted Answer · 2021-01-15 10:50:42Z

2

I've got similar problem - my formatting started at -1 - > so i had java.lang.ArrayIndexOutOfBoundsException So I fixed it like this:

@Override
    public String getFormattedValue(float value) {

        if (((int) value) < values.size() && (int) value >= 0) {
            //Log.e(TAG, "getFormattedValue: " + (int) value); // value is -1, exception!
            String strDate = values.get((int) value);
            if (mCurrentRange == 7)
                strDate = getDayOfWeekFromStr(strDate);
            else strDate = removeYearFromDate(strDate);
            return strDate;
        } else {
            return "0";
        }
    }

answered Jan 15, 2021 at 10:50

Victor Pozdnyakov

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Comments

Dino · Accepted Answer · 2019-10-15 10:26:58Z

I am having some issue in adding String to xaxis

{
                    ArrayList<Entry> yvalues = new ArrayList<>();
                    ArrayList<String> labels = new ArrayList<String>();
                    String[] values = new String[]{"Jan","Feb","Mac"};
                    for (int i = 0; i < graphData.getDate().size(); i++) {
                        yvalues.add(new Entry(i,Float.parseFloat(graphData.getMeasurement().get(i))));
                    }
                    lineChart.getAxisRight().setEnabled(false);
                    LineDataSet dataSet = new LineDataSet(yvalues, "Cells");
                    dataSet.setFillAlpha(110);
                    ArrayList<ILineDataSet> dataSets = new ArrayList<>();
                    dataSets.add(dataSet);
                    dataSet.setLineWidth(3f);
                    dataSet.setValueTextColor(Color.WHITE);
                    dataSet.setColor(Color.RED);
                    LineData data = new LineData(dataSets);
                    lineChart.setData(data);
                    XAxis xAxis = lineChart.getXAxis();
                    xAxis.setValueFormatter(new MyXAxisValueFormatter(values));

                }

MyXAxisValueFormatter is this

public class XAxisValueFormatter extends IAxisValueFormatter{
    private String[] mvalues;
    public XAxisValueFormatter(String[] mvalues){
        this.mvalues = mvalues;
    }

    @Override
    public String getFormattedValue(float value, AxisBase axis) {
        System.out.println("value"+mvalues[(int)value]);
        return mvalues[(int)value];
    }
}

When adding value to MyXAxisValueFormatter it is showing error

setValueFormatter(com.github.mikephil.chartinf.formatter.ValueFormatter) in AxisBase cannot be applied to (com.anu.myapp.myFragment.XAxisValueFormatter)

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