The YAxisValueFormatter interface

Available since v2.1.4

The YAxisValueFormatter interface can be used to create custom-made formatter classes that allow to format the labels of the YAxis in a specific way before drawing them.

For using the YAxisValueFormatter, simply create a new class and let it implement the interface and return whatever you want to be displayed from the getFormattedValue(...) method.

Example of a custom formatter

public class MyYAxisValueFormatter implements YAxisValueFormatter {

    private DecimalFormat mFormat;
    
    public MyYAxisValueFormatter () {
        mFormat = new DecimalFormat("###,###,##0.0"); // use one decimal
    }
    
    @Override
    public String getFormattedValue(float value, YAxis yAxis) {
        // write your logic here
        // access the YAxis object to get more information
        return mFormat.format(value) + " $"; // e.g. append a dollar-sign
    }
}

Then, set your formatter to the YAxis object:

// get an instance of the YAxis (e.g. left axis)
YAxis leftAxis = chart.getAxisLeft();
leftAxis.setValueFormatter(new MyYAxisValueFormatter());

Predefined custom formatters

• LargeValueFormatter: Can be used for formatting large values > "1.000". It will turn values like "1.000" into "1k", "1.000.000" will be "1m" (million), "1.000.000.000" will be "1b" (billion) and values like one trillion will be e.g. "1t". It does not support numbers with decimal digits like "1.000,5".
• PercentFormatter: Used for displaying a "%" sign after each value with 1 decimal digit. Especially useful for the PieChart. 50 -> 50.0 %