Java.Lang.Numberformatexception: Invalid Double: " "

java.lang.numberformatexception: invalid double:

The reason is, that "" is not a valid double. You need to test the String before or catch such exceptions

double w;

try {
    w = new Double(input3.getText().toString());
} catch (NumberFormatException e) {
    w = 0; // your default value
}

NumberFormatException: Invalid double: ٢

d = Double.parseDouble(new DecimalFormat("####.00").format(d).replace("٠", "0")
                    .replace("١", "1").replace("٢", "2").replace("٣", "3")
                    .replace("٤", "4").replace("٥", "5").replace("٦", "6")
                    .replace("٧", "7").replace("٨", "8").replace("٩", "9")
                    .replace("٫", "."));

// based on Sweeper answer :)

java.lang.NumberFormatException: Invalid double

The value of the double depends on the language of the device. For example, for devices in french the number 0.179927 becomes 0,179927 which will always throw a NumberFormatException when parsing it to double because of the comma.

You need to change the separator from a comma to a point.
You can change the separator either by setting a locale or using the DecimalFormatSymbols.

If you want the grouping separator to be a point, you can use a european locale:

NumberFormat nf = NumberFormat.getNumberInstance(Locale.GERMAN);
DecimalFormat df = (DecimalFormat)nf;

Alternatively you can use the DecimalFormatSymbols class to change the symbols that appear in the formatted numbers produced by the format method. These symbols include the decimal separator, the grouping separator, the minus sign, and the percent sign, among others:

DecimalFormatSymbols otherSymbols = new DecimalFormatSymbols(currentLocale);
otherSymbols.setDecimalSeparator(',');
otherSymbols.setGroupingSeparator('.'); 
DecimalFormat df = new DecimalFormat(formatString, otherSymbols);

java.lang.NumberFormatException: Invalid double: at java.lang.StringToReal.invalidReal

try {
   inp = Double.valueOf(fromInput.getText().toString());
} catch (NumberFormatException e) {
   inp = 0;
}

Error Invalid DOUBLE

Your problem is java.lang.NumberFormatException: Invalid double: "" .

Sample

String str = "";
if(!TextUtils.isEmpty(str)){
    double d = Double.parseDouble(str);
}

Try this in your code .

if (!TextUtils.isEmpty(location.get(i).get("Latitude").toString()) &&!TextUtils.isEmpty(location.get(i).get("Longitude").toString())){
        campo_latitud = Double.parseDouble(location.get(i).get("Latitude").toString());
        campo_longitud = Double.parseDouble(location.get(i).get("Longitude").toString());
} 

Getting NumberFormatException: Invalid double:

1) Try to change your AllUserMessages class Latitude, Longitude variables type double to String

2) Or change Latitude, Longitude from server site to double.

How to Fix java.lang.NumberFormatException: Invalid double: ?

You are calling

getLang = lat.getText().toString();
getlong = longs.getText().toString();

from onCreate()

Those values are not set yes, so its text is "";

Move those into loadMapScene() method

java.lang.NumberFormatException: Invalid double' for European languages, using Kotlin

I can't try it at the moment but something like

val otherSymbols = DecimalFormatSymbols()
otherSymbols.setDecimalSeparator(',')
otherSymbols.setGroupingSeparator('.')
DecimalFormat df = DecimalFormat("#.##", otherSymbols)
df.roundingMode = RoundingMode.CEILING
val lengthCalc = 0.01658
val length = df.format(lengthCalc)

should do the trick. You need to use decimal format symbols for Europe, so a comma for the decimals and a full stop for the thousands.

An alternative to do it on a locale basis is to use NumberFormat and cast it to a DecimalFormat

val df = NumberFormat.getNumberInstance(currentLocale) as DecimalFormat
df.applyPattern("#.##")
...
df.format(lengthCalc)

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