convert string to float in android

Question

I am trying to convert string to float but I couldnt succeed.

here is my code

float f1 = Float.parseFloat("1,9698");

the error it gives is

Invalid float  "1,9698";

why is it doing this? it is a valid float

@ayilmaz yes .replace it .I haved added the solution as answer also . — Rachita Nanda
– Rachita Nanda, Commented Jun 25, 2013 at 7:17
Your locale is not set correctly to allow commas in floating point numbers. You need to use a locale which allows this. — Peter Lawrey
– Peter Lawrey, Commented Jun 25, 2013 at 7:19

JREN · Accepted Answer · 2013-06-25 07:13:45Z

15

You are using a comma when you should be using a period

float f1 = Float.parseFloat("1.9698");

That should work.

answered Jun 25, 2013 at 7:13

JREN

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Comments

Avadhani Y · Accepted Answer · 2013-06-25 07:19:18Z

5

You have added comma instead of '.'

Do like this.

float f1 = Float.parseFloat("1.9698");

edited Jun 25, 2013 at 7:19

Avadhani Y

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answered Jun 25, 2013 at 7:16

Rachita Nanda

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Comments

bko · Accepted Answer · 2022-02-03 09:01:24Z

3

I suggest you use something like this:

String text = ...;
text = text.replace(",", ".");

if(text.length() > 0) {
    try {
        float f = Float.parseFloat(text);
        Log.i(TAG, "Found float " + String.format(Locale.getDefault(), "%f", f));
    } catch (Exception e) {
        Log.i(TAG, "Exception " + e.toString());
    }
}

answered Feb 3, 2022 at 9:01

bko

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Comments

Dharman · Accepted Answer · 2022-09-24 15:12:36Z

3

Float number;
String str=e1.getText().toString();
number = Float.parseFloat(str);

Or In one line

float float_no = Float.parseFloat("3.1427");

edited Sep 24, 2022 at 15:12

Dharman♦

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answered Jun 25, 2013 at 7:17

Vaishali Sharma

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Comments

HebeleHododo · Accepted Answer · 2016-11-23 06:00:01Z

2

Float total = Float.valueOf(0);
try
{
    total = Float.valueOf(str);
}
catch(NumberFormatException ex)
{
    DecimalFormat df = new DecimalFormat();
    Number n = null;
    try
    {
        n = df.parse(str);
    } 
    catch(ParseException ex2){ }
    if(n != null)
        total = n.floatValue();
}

edited Nov 23, 2016 at 6:00

HebeleHododo

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answered Nov 23, 2016 at 5:44

Makvin

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3 Comments

Werner Henze Over a year ago

Some comments would be good. The questioner is asking why his code does not work. It would be nice to answer that question, too.

Makvin Over a year ago

because comma(,) is not converted into float so we use decimalformat

likeme Over a year ago

This would be the right answer. This problem is because there is no character internationalization.And I googled that turkey uses a semicolon for decimals. Should use ICU developer.android.com/guide/topics/resources/… Look at this developer.android.com/reference/android/icu/text/DecimalFormat

Mr.Sandy · Accepted Answer · 2013-06-27 12:43:15Z

1

This is Type Conversion: type conversion required when we use different type of data in any variables.

    String str = "123.22";

    int i = Integer.parseInt(str);
    float f = Float.parseFloat(str);
    long l = Long.parseLong(str);
    double d= Double.parseDouble(str);

    str = String.valueOf(d);
    str = String.valueOf(i);
    str = String.valueOf(f);
    str = String.valueOf(l);

Also some times we need Type Casting: type casting required when we use same data but in different type. only you cast Big to Small Datatype.

    i = (int)f;
    i = (int)d;
    i = (int)l;

    f = (float)d;
    f = (float)l;

    l = (long)d;

answered Jun 27, 2013 at 12:43

Mr.Sandy

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Comments

user2039429 · Accepted Answer · 2015-05-29 09:00:35Z

1

used this float f1 = Float.parseFloat("1.9698"); or replace ,(comma) with .(dot) that is invalid form of flot number

answered May 29, 2015 at 9:00

user2039429

Comments

vishnu benny · Accepted Answer · 2020-03-29 06:56:14Z

1

In kotlin:

stringValue.toFloatOrNull() ?: 0F

Which will give NumberFormatException free conversion.

More precise:

private fun getFloat(stringValue: String) = stringValue.toFloatOrNull() ?: 0F

answered Mar 29, 2020 at 6:56

vishnu benny

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