Java – DateTimeFormatter does not use Arabic or Bengali native numbers

I’m trying to display a specific time in a TextView using the DateTimeFormatter API, but whenever I run my app my device is set to Arabic or Bengali, somehow the time always seems to show Western numerals. Is this intentional, or is there something I need to do to fix this?

Kotlin

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

val localizedTimeFormatter = DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT)

val timeOpen = LocalTime.of(9, 30)
        val timeClose = LocalTime.of(17, 15)

tv_time.text = (timeOpen.format(localizedTimeFormatter) +
                "\n\n" + timeClose.format(localizedTimeFormatter))
    }
}

Clock app (Arabic).

My app (Arabic).

Clock app (Bengali).

My app (Bengali).

This is by design. DateTimeFormatter's instances, even localized ones, use Western/ASCII numerals unless explicitly stated otherwise. The instructions are not difficult when you know how to do it:

    DateTimeFormatter localizedTimeFormatter = DateTimeFormatter
            .ofLocalizedTime(FormatStyle.SHORT)
            .withDecimalStyle(DecimalStyle.ofDefaultLocale());
    
LocalTime timeOpen = LocalTime.of(9, 30);
    LocalTime timeClose = LocalTime.of(17, 15);
    
String text = timeOpen.format(localizedTimeFormatter)
            + '\n' + timeClose.format(localizedTimeFormatter);
    System.out.println(text);

Output of the Bengali locale (bn-BD):

৯:৩০ AM
৫:১৫ PM

Arabic (ar):

٩:٣٠ ص
٥:١٥ م

I hope you can translate my Java code yourself. I believe it shouldn’t be difficult.