How to print a double with two decimals in Android? [duplicate]

Question

Maybe this is a silly question, but I cannot guess how to solve it if it's not creating a method. Maybe there's a "natural way" to do it, like in C for example. Here's the problem:

I have a var:

double a;

And I want to show it only with 2 or 3 decimals. When I try to show it:

Text.setText("Value of a: " + String.valueOf(a));

It gives something like:

Value of a: 5.234966145

And i would want just

Value of a: 5.23

Without changing the real value of a so it shows the approximate number but works with the real number.

Olympic

doubleNumber.toString().substring(0, 3) – Husbandry

input?.let { if (input == "0" || input == "0.0") { return "0.00" } return try { val formatter = DecimalFormat("#,###,###.00") formatter.format(input.toDouble()) } catch (e: Exception) { it } } – Monnet

Answer 1

yourTextView.setText(String.format("Value of a: %.2f", a));

Mannerless

This gives a warning: "Implicitly using the default locale is a common source of bugs: Use String.format(Locale, ...) instead" – Dibru

@Dibru that's because of variable symbols used in different countries. Even if you specify the correct formatting, you have to do the same if you parse it later. If you aren't doing that, it doesn't matter AT ALL because it uses the system settings of the device, which you should use anyway. – Shererd

Answer 2

For Displaying digit upto two decimal places there are two possibilities - 1) Firstly, you only want to display decimal digits if it's there. For example - i) 12.10 to be displayed as 12.1, ii) 12.00 to be displayed as 12. Then use-

DecimalFormat formater = new DecimalFormat("#.##"); 

2) Secondly, you want to display decimal digits irrespective of decimal present For example -i) 12.10 to be displayed as 12.10. ii) 12 to be displayed as 12.00.Then use-

DecimalFormat formater = new DecimalFormat("0.00"); 

Tetzel

This will format "0" as ".00". Instead use new DecimalFormat("0.00") to display "0" as "0.00" – Hoye

Answer 3

You can use a DecimalFormat, or String.format("%.2f", a);

Teneshatenesmus

Answer 4

Before you use DecimalFormat you need to use the following import or your code will not work:

import java.text.DecimalFormat;

The code for formatting is:

DecimalFormat precision = new DecimalFormat("0.00"); 
// dblVariable is a number variable and not a String in this case
txtTextField.setText(precision.format(dblVariable));

Semiweekly

Your code shows rounded values. For example, it shows 2.82 by calling precision.format(2.81666666)... – Montemayor

which is the desired behavior, isn't it? – Plate

Answer 5

textView2.setText(String.format("%.2f", result));

and

DecimalFormat form = new DecimalFormat("0.00");
         textView2.setText(form.format(result) );

...cause "NumberFormatException" error in locale for Europe because it sets result as comma instead of point decimal - error occurs when textView is added to number in editText. Both solutions are working excellent in locale US and UK.

Rodney