Question

i am learning to program mobile aplications on Android. My first app is a unit converter. Everithing is working for now, but i have a question about formating numbers. I hava this code to get text from buttons and to convert the appropriet output:

if (bPrevodZ.getText() == "milimeter"){
    if (bPrevodDo.getText()=="kilometer"){
        String PomocnaPremenna = jednotkaZ.getText().toString();
        double cisloNaPrevod = Double.parseDouble(PomocnaPremenna);
        cisloNaPrevod = cisloNaPrevod*0.0000001;
        vysledok.setText(Double.toString(cisloNaPrevod));
    }

The final result is “cisloNaPrevod”, but i have problems to show a good format of that number. For example:
12345 mm = 0,0012345 km this is good right ? 🙂

but if i convert:
563287 mm = 0.05632869999999995 this is bad 🙂 i need it to show 0.0563287

Thx for any help

Answer 1

Use String.format:

String.format("%.6f", cisloNaPrevod);