Error: Caused by: java.lang.NumberFormatException: Invalid double: ""

Question

How to convert a string to double?

MainActivity.java

Location savedLocation = new Location("databaseLocation");
                savedLocation.setLatitude(Double.parseDouble(latitude));

Logcat:

07-06 14:41:21.870: E/AndroidRuntime(24097): FATAL EXCEPTION: main
07-06 14:41:21.870: E/AndroidRuntime(24097): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.locademo/com.example.locademo.MainActivity}: java.lang.NumberFormatException: Invalid double: ""
07-06 14:41:21.870: E/AndroidRuntime(24097):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2146)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at android.app.ActivityThread.access$700(ActivityThread.java:140)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1238)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at android.os.Handler.dispatchMessage(Handler.java:99)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at android.os.Looper.loop(Looper.java:177)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at android.app.ActivityThread.main(ActivityThread.java:4947)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at java.lang.reflect.Method.invokeNative(Native Method)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at java.lang.reflect.Method.invoke(Method.java:511)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at dalvik.system.NativeStart.main(Native Method)
07-06 14:41:21.870: E/AndroidRuntime(24097): Caused by: java.lang.NumberFormatException: Invalid double: ""
07-06 14:41:21.870: E/AndroidRuntime(24097):    at java.lang.StringToReal.invalidReal(StringToReal.java:63)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at java.lang.StringToReal.parseDouble(StringToReal.java:248)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at java.lang.Double.parseDouble(Double.java:295)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at com.example.locademo.MainActivity.getExpandableListData(MainActivity.java:203)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at com.example.locademo.MainActivity.onCreate(MainActivity.java:107)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at android.app.Activity.performCreate(Activity.java:5207)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
07-06 14:41:21.870: E/AndroidRuntime(24097):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2085)
07-06 14:41:21.870: E/AndroidRuntime(24097):    ... 11 more

You are trying to cast an **empty string** to a number. Which is **not valid**. — Phantômaxx, Jul 06 '15 at 09:16
@BinkanSalaryman: Yeah... I got that from the stack trace. But I asked this question to OP, so that he might get where he went wrong. — Prerak Sola, Jul 06 '15 at 09:19
When I print the value of latitude in Log so its showing the value of latitude so its not an empty string @DerGolem — Manish, Jul 06 '15 at 09:22
So if you have a value in `latitude`, can you show how do you get that value? — Prerak Sola, Jul 06 '15 at 09:26
This is **very clear**: `Caused by: java.lang.NumberFormatException: Invalid double: ""` — Phantômaxx, Jul 06 '15 at 09:29
possible duplicate of [java.lang.numberformatexception: invalid double: " "](http://stackoverflow.com/questions/18672456/java-lang-numberformatexception-invalid-double) — Sufian, Aug 04 '15 at 10:41

score 3 · Answer 1 · answered Jul 06 '15 at 09:24

Error clearly shows your value is empty

java.lang.NumberFormatException: Invalid double: ""

You need add one condition like this

if (!latitude.equals("")){
Location savedLocation = new Location("databaseLocation");
                savedLocation.setLatitude(Double.parseDouble(latitude));
}

Note : Whenever you make number format conversion make sure you don't get any empty or null values

score 1 · Answer 2 · answered Jul 06 '15 at 09:25

Double.parseDouble(String) is working fine, but throws an NumberFormatException if the supplied value cannot be converted to a double. Referring to the second line of your stacktrace:

java.lang.NumberFormatException: Invalid double: ""

means in this case latitude had the value "" (empty string) and the conversion failed. You may implement some checks for blank strings (empty string or null), fix the value of latitude before it reaches the conversion or catch the exception and handle it.

Samir Bhatt · Answer 3 · 2015-10-14T12:33:12.837

-1

Check that youR latitude value will be null or blank.

if (!latitude.equals("")){
// apply your logic
}

edited Oct 14 '15 at 12:33

answered Jul 06 '15 at 09:19

Samir Bhatt

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Error: Caused by: java.lang.NumberFormatException: Invalid double: ""

3 Answers3