Round number to only first decimal place

Question

I would like to know the available phone memory, so I wrote this code.

File path2 = Environment.getDataDirectory();
StatFs stat2 = new StatFs(path.getPath());
lo         


        

Answer 1

If you need the value for display purpose, use NumberFormat (see answer by Adam Arnold).

For numeric rounding (producing the rounded number), use BigDecimal:

double num = 3.141592653589793d;
double rounded = BigDecimal.valueOf(num).setScale(1, BigDecimal.ROUND_HALF_UP).doubleValue();

Answer 2

Have you tried using free = Math.round(free * 10) / 10d; instead of free = Math.round(size * 10) / 10d;? I don't see size as a defined variable.

A simple test of

double free = 5.654707363;
free = Math.round(free * 10) / 10d;
System.out.println(free);

outputs 5.7.

Answer 3

If I understood your question right you need NumberFormat here:

NumberFormat nf = NumberFormat.getInstance();
nf.setMaximumFractionDigits(1);
nf.format(5.654707363);

produces 5,7