How to go about formatting 1200 to 1.2k in Android studio

Question

I'd like to format following numbers into the numbers next to them with Android:

1000 to 1k 5821 to 5.8k 2000000 to 2m 7800000 to 7.8m

Answer 1

Function

public String prettyCount(Number number) {
    char[] suffix = {' ', 'k', 'M', 'B', 'T', 'P', 'E'};
    long numValue = number.longValue();
    int value = (int) Math.floor(Math.log10(numValue));
    int base = value / 3;
    if (value >= 3 && base < suffix.length) {
        return new DecimalFormat("#0.0").format(numValue / Math.pow(10, base * 3)) + suffix[base];
    } else {
        return new DecimalFormat("#,##0").format(numValue);
    }
}

Use

prettyCount(789); Output: 789
prettyCount(5821); Output: 5.8k
prettyCount(101808); Output: 101.8k
prettyCount(7898562); Output: 7.9M

Answer 2

Try this method :

For Java

public static String formatNumber(long count) {
    if (count < 1000) return "" + count;
    int exp = (int) (Math.log(count) / Math.log(1000));
    return String.format("%.1f %c", count / Math.pow(1000, exp),"kMGTPE".charAt(exp-1));
}

For Kotlin(Android)

fun getFormatedNumber(count: Long): String {
if (count < 1000) return "" + count
val exp = (ln(count.toDouble()) / ln(1000.0)).toInt()
return String.format("%.1f %c", count / 1000.0.pow(exp.toDouble()), "kMGTPE"[exp - 1])
}