Develop Reference

Java convert location coordinates into double for long and lat

I've been making an mobile android application on android studio and I've got locations saved on the database. I need to convert these long and lats into a double so that it can be used in a google maps fragment.
At the moment it is getting the string from the database like this:
Cursor res = dbHelper3.getEvent(journey, message);
if (res.getCount() == 0) {
showMessageData("Error", "No data");
return;
}
StringBuffer buffer = new StringBuffer();
while (res.moveToNext()) {
buffer.append(res.getString(1));
}
but theres an issue with converting it into a double as both long and lat are saved as one big string. For example it will print:
"52.301293 0.185935"
When I try this
String location = buffer.toString();
locationText.setText(buffer.toString().trim());
float f = Float.parseFloat(location);
it gives an error:
This cannot be converted into a double as its two separate numbers Is there a way of somehow separating these into two double numbers or do I have to redesign the way my database gets the location ?

You are trying to convert a string containing space into double, which will ultimately crash app.
You need to split your string ''location'' to two strings by space as:
String[] splited = location.split("\\s+");
Then you can covert it to double as below
double latitude = Double.parseDouble(splited[0]);
double longitude = Double.parseDouble(splited[1]);

You need to keep the latitude and longitude information separately like that:
String location = "52.301293 0.185935";
String[] afterSplitLoc = location.split(" ");
After that convert them to Double like that :
double latitude = Double.parseDouble(afterSplitLoc[0]);
double longitude = Double.parseDouble(afterSplitLoc[1]);
And than use on map. For example add a marker:
private GoogleMap googleMap((MapView)rootView.findViewById(R.id.YOURMAPID)).getMap();
googleMap.addMarker(new MarkerOptions().position(new LatLng( latitude, -longitude)).title("Marker"));

IMO, unless you have special reason, you should save the latitude and longitude in separate columns, as it will make future update operation easier.
You can use split() method to separate the two values:
String location = "52.301293 0.185935";
String[] latlng = location.split(" ");
System.out.println("Lat = " +latlng[0]+" Longitude = "+latlng[1]);
//You will get sth like "Lat = 52.301293 Longitude = 0.185935"

Just use something like this:
String location = buffer.toString().trim();
String[] latLon = location.split(" ");
double lat = Double.parseDouble(latLon[0]);
double lon = Double.parseDouble(latLon[1]);

thanks kshetline,
worked perfect
String string = buffer.toString();
String[] parts = string.split(" ");
String part1 = parts[0]; // 004
String part2 = parts[1]; // 034556
locationText.setText(part1 + "\n" + part2);
float longNum = Float.parseFloat(part1);
float latNum = Float.parseFloat(part2);
locationText.setText(longNum + "\n" + latNum);
final LatLng eventLocation1 = new LatLng(longNum, latNum);

How to convert string with $ sing in it to int

I have a string "$1,076.00" and I want to convert them in to int,
I capture some value $1,076.00 and saved in string called originalAmount,
and tried int edited = Integer.parseInt(originalAmount); and it gave me error java.lang.NumberFormatException: For input string: "$1,076.00"
can anyone help?

You need to remove the undesired part ($ sign) and then parse the string to double carefully since the decimal part is a locale dependent
String pay = "$1,076.00";
NumberFormat format = NumberFormat.getInstance(Locale.FRANCE);
Number number = format.parse(pay.replace("$", ""));
double result = number.doubleValue();
System.out.println(result);

string sourceString = "$1,076.00";
sourceString.substring(1, sourceString.length() - 1)
int foo = Integer.parseInt(sourceString);

Try this:
String amount = "$1,076,.00";
String formatted = amount.replace("$", ""); // remove "$" sign
formatted = formatted.replace(",", ""); // remove "," signs from number
double amountDouble = Double.parseDouble(formatted); // convert to double
int amountInt = (int)amountDouble; // convert double value to int
System.out.println(amountInt); // prints out 1076

String originalAmount="$1076.00";
String amount = originalAmount.replace($,"");
int edited = Integer.parseInt(amount);

Thanks everyone yr answers help me a lot
I have come up with
originalAmount = originalAmount.substring(1);
if (originalAmount.contains("$")) {
originalAmount = originalAmount.replace("$", "");
}
newOriginalAmt = Double.parseDouble(originalAmount);
System.out.println(newOriginalAmt);
pls let me know yr thoughts

Conversion of double to string gives exponent values

I am trying to convert a string 32,646,513.32 to a double and then convert it to a string in scientific notation like this 3.264651332E7. The code below is
double amount = 0;
for (Payments payments : pvor.getPayments()) {
payments.setDocumentNumber(pvor);
amount += Double.parseDouble(payments.getAmount());
payments.setDate(new Date());
}
DecimalFormat df = new DecimalFormat("#.00");
double totalAMount = Double.valueOf(df.format(amount));
Double totalAMounts = (Double) totalAMount;
pvor.setAmount(String.valueOf(totalAMounts.doubleValue()));
How do I display large numbers in same format as I give?

Instead of using just String.valueOf(totalAmounts), which give you number in exponential format, you need to format your double value to match the string format that you want. Try something like new DecimalFormat("#,###.00").format(totalAmounts). Or simply use String.format("%,.2f", totalAMounts).

If I understood your problem correctly then you do not need String.valueOf() but String.format().
Here is the code snippet:
public static void main (String[] args) throws Exception
{
String input = "32,646,513.32";
double value = Double.parseDouble(input.replace(",",""));
String output = String.format("%f",value);
System.out.println("Value: " + output);
}
Output:
Value: 32646513.320000
Replace the following line in your code appropriately:
/* Note the change from `valueOf()` to `format()` */
pvor.setAmount(String.format("%f",totalAMounts.doubleValue()));

Convert string to float: "8.9km" to float

I'm getting the distance in string like "8.9km". I need to convert it to float.
So if the string is "8.9km", the corresponding float will be 8.9
How to achieve this in Java?
Note: The value can change to miles/meters also, since it is retrieved from Google Maps

You can try the following code,
String dis = "8.9km";
Float distance = Float.valueof(dis.substring(0,dis.indexOf("km")));
float d = distance.floatValue();

You can do
String distance = "8.9km";
float distanceInFloat = Float.parseFloat(distance.substring(0,distance.indexOf("km")));
System.out.println(distanceInFloat);
Output :
8.9

Use following code:
String s="8.9km";
s=s.replace("km", "");
float f=Float.parseFloat(s);
System.out.println(f);
Output:
8.9
Hope it helps.

try the following for removing all non-digits(excluding '.') from a string
String distance = "7.9km";
float floatValue = Float.parseFloat(distance.replaceAll("[^\\d.]",""));
System.out.println(floatValue);

String str = "8.9km";
str = (str.replace("km", ""); //remove the km
float f = Float.parseFloat(str); //convert the string to a float
The float f will now have a value of 8.9
System.out.println(f);
Output:
8.9

Try this:
public float parse(String string, String suffix) { // suffix can be m, km etc.
if (!string.endsWith(suffix)) {
throw new IllegalArgumentException();
}
string = string.subString(0, string.length() - suffix.length()); // get rid of the suffix we have at the end
return Float.parseFloat(string); // parse the float from what we have left
}
If the float is invalid, or the string doesn't end in "km", a NumberFormatException or IllegalArgumentException will be thrown, respectively.

Try this.. i hope it will help
String km = "8.9km";
float kmInFloat=Float.parseFloat(km.replaceAll("km",""));
System.out.println(kmInFloat);
Output :
8.9

NumberFormatException for input string to double

In my android app, I am trying to convert a string value to a double value. But it throws NumberFormatException. The string value is "30.192781000000000"
My code is,
String Latitude="30.192781000000000";
double Lat2 = Double.parseDouble(Latitude.trim());
I have tried with this also,
NumberFormat nf = NumberFormat.getInstance(Locale.US); // Looks like a US format
double lat2=nf.parse(Latitude.trim()).toDouble();
But didnot work. Please suggest me any solution. I have to work with a double value and not a string value.
Thanks in advance!!

Try this Code i think this should work.
NumberFormat _format = NumberFormat.getInstance(Locale.US);
Number number = null;
try {
number = _format.parse(latitude);
double _double = Double.parseDouble(number.toString());
System.err.println("Double Value is :"+_double);
} catch (ParseException e) {
}
Thank you,

Blockquote
String latitude="30.192781000000000";
double latitude2= Double.parseDouble(latitude.toString());

that isnt valid java code. try:
String latitude = "30.192781000000000";
double latDouble = Double.parseDouble(latitude);