CODEWITHSUNDEEP
javaandroid
Arif YILMAZ
Arif YILMAZ

Reputation: 5866

convert string to float in android

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

Upvotes: 8

Views: 39608

Answers (8)

Vaishali Sharma
Vaishali Sharma

Reputation: 602

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

Or In one line

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

Upvotes: 3

bko
bko

Reputation: 106

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());
    }
}

Upvotes: 3

vishnu benny
vishnu benny

Reputation: 1058

In kotlin:

stringValue.toFloatOrNull() ?: 0F

Which will give NumberFormatException free conversion.

More precise:

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

Upvotes: 1

Makvin
Makvin

Reputation: 3629

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();
}

Upvotes: 2

user2039429
user2039429

Reputation:

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

Upvotes: 1

Mr.Sandy
Mr.Sandy

Reputation: 4349

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;

Upvotes: 1

Rachita Nanda
Rachita Nanda

Reputation: 4659

You have added comma instead of '.'

Do like this.

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

Upvotes: 5

JREN
JREN

Reputation: 3630

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

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

That should work.

Upvotes: 15

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