android - Add x axis as datetime label in MPAndroidChart? (Kotlin)

Question

I believe this question and answer explains how to format time series data into readable date labels in Java. How do you do the same thing in Kotlin?

Answer 1

You could create a custom formatter class extending the IAxisValueFormatter:

class MyCustomFormatter() : IAxisValueFormatter 
{
    override fun getFormattedValue(value: Float, axis: AxisBase?): String
    {   
        val dateInMillis = value.toLong()
        val date = Calendar.getInstance().apply {
            timeInMillis = dateInMillis
        }.time

        return SimpleDateFormat("dd MMM", Locale.getDefault()).format(date)
    }
}

Then assign it to your chart with

    chart?.xAxis?.valueFormatter = MyCustomFormatter()