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, Jun 25 '13 at 07:17
Your locale is not set correctly to allow commas in floating point numbers. You need to use a locale which allows this. — Peter Lawrey, Jun 25 '13 at 07:19

score 14 · Answer 1 · answered Jun 25 '13 at 07:13

14

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

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

That should work.

answered Jun 25 '13 at 07:13

JREN

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score 5 · Answer 2 · edited Jun 25 '13 at 07:19

5

You have added comma instead of '.'

Do like this.

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

edited Jun 25 '13 at 07:19

Avadhani Y

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answered Jun 25 '13 at 07:16

Rachita Nanda

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Vaishali Sharma · Answer 3 · 2017-01-09T06:32:06.200

4

Hope this will help you..

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

Or In one line-

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

edited Jan 09 '17 at 06:32

answered Jun 25 '13 at 07:17

Vaishali Sharma

670
3
6
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score 1 · Answer 4 · answered Jun 27 '13 at 12:43

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;

score 1 · Answer 5 · answered May 29 '15 at 09:00

1

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

answered May 29 '15 at 09:00

score 1 · Answer 6 · edited Nov 23 '16 at 06:00

1

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 '16 at 06:00

HebeleHododo

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answered Nov 23 '16 at 05:44

Makvin

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Some comments would be good. The questioner is asking why his code does not work. It would be nice to answer that question, too. – Werner Henze Nov 23 '16 at 06:05
because comma(,) is not converted into float so we use decimalformat – Makvin Nov 24 '16 at 04:50

score 1 · Answer 7 · answered Mar 29 '20 at 06:56

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 '20 at 06:56

vishnu benny

774
7
14

score 1 · Accepted Answer · answered Feb 03 '22 at 09:01

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());
    }
}

convert string to float in android

8 Answers8