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Pablo Simon DiEstefano
Asked: 2020-01-25 04:49:34 +0800 CST 2020-01-25 04:49:34 +0800 CST

How to modify the number of decimal places that the marker shows in the graph?

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I am using LineChart to be able to generate a graph and represent certain values.

I get this graph from the following library: com.github.PhilJay:MPAndroidChart:v3.0.0-beta1

My problem comes when it comes to seeing the points drawn on the graph since it shows me said points with 3 decimal places and the values ​​that I give it are with 0, 1 or 2 decimal places, never with 3.

For example, if I enter 1.2 on the graph it shows me 1,200.

Example of the graph

As you can see, all the values ​​are shown to me with 3 decimal places.

The way I generate the points is as follows:

entries.add(new Entry((float) listaFechasOrig[listaDatos.length - 1 - i].getTime(), Float.parseFloat(datoOrigRecortado.replace(",","."))));

There, the values ​​are passed correctly (with the desired decimal places).

The marker I use is a custom one that inherits from the MarkerView, this is the code but this is not where it rounds it off.

public class CustomMarkerView extends MarkerView {

private TextView tvContent;
private Context cont;

public CustomMarkerView (Context context, int layoutResource) {
    super(context, layoutResource);
    // this markerview only displays a textview
    tvContent = (TextView) findViewById(R.id.tvContent);
    cont = context;

}

// callbacks everytime the MarkerView is redrawn, can be used to update the
// content (user-interface)
@Override
public void refreshContent(Entry e, Highlight highlight) {
    Date d = new Date((long)e.getX());
    String fecha = d.toString().substring(0,20);

    fecha = fecha.replace("Jan", "Ene");
    fecha = fecha.replace("Apr", "Abr");
    fecha = fecha.replace("Aug", "Ago");
    fecha = fecha.replace("Dec", "Dic");

    fecha = fecha.replace("Mon", "Lunes");
    fecha = fecha.replace("Tue", "Martes");
    fecha = fecha.replace("Wed", "Miércoles");
    fecha = fecha.replace("Thu", "Jueves");
    fecha = fecha.replace("Fri", "Viernes");
    fecha = fecha.replace("Sat", "Sábado");
    fecha = fecha.replace("Sun", "Domingo");

    try
    {
        Tab1Prueba.rellenaDatos(fecha, e.getY()+"");
    }catch(Exception exc)
    {}

    try
    {
        Tab1Gra.rellenaDatos(fecha, e.getY()+"");
    }catch(Exception exc)
    {}
}

@Override
public int getXOffset(float xpos) {
    // this will center the marker-view horizontally
    return -(getWidth() / 2);
}

@Override
public int getYOffset(float ypos) {
    // this will cause the marker-view to be above the selected value
    return -getHeight();
}
}

I thought it was a property of the Marker but I haven't put anything on it (I don't know if it comes from the class I inherited) or some attribute of the graph must be changed and not of the marker.

Thanks.

java

1 Answers

  1. Best Answer

    What you should do is use a formatter provided by the library itself, as explained here .

    First you implement the interfaceIValueFormatter

    public class MyValueFormatter implements IValueFormatter {

    private DecimalFormat mFormat;

    public MyValueFormatter() {
        mFormat = new DecimalFormat("###,###,##0.0"); // usar un decimal        }

    @Override
    public String getFormattedValue(float value, Entry entry, int dataSetIndex, ViewPortHandler viewPortHandler) {
        // escribe aqui tu logica
        return mFormat.format(value) + " $"; // por ejemplo,agregar un simbolo de dolar
    }
}

    And to use it, you simply call the method setValueFormatterpassing your class as a parameter:

    // uso en un objeto de datos completo
lineData.setValueFormatter(new MyValueFormatter());

// uso en un objeto de datos individual
lineDataSet.setValueFormatter(new MyValueFormatter());
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