Matjaž Mav Matjaž Mav - 3 months ago 107
Java Question

Android parse String to Date - unknown pattern character 'X'

I have

Service
fetch date string from web and then I want to pare it to
Date
object. But somehow application crashes.
This is my string that I'm parsing:
2015-02-05T05:20:02+00:00


onStartCommand()

String datetime = "2015-02-05T05:20:02+00:00";
Date new_date = stringToDate(datetime);


stringToDate()

private Date stringToDate(String s){
DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");
try{
return df.parse(s);
}catch(ParseException e){
e.printStackTrace();
}
return null;
}


LogCat:

02-06 20:37:02.008: E/AndroidRuntime(28565): FATAL EXCEPTION: main
02-06 20:37:02.008: E/AndroidRuntime(28565): Process: com.dotmav.runescapenotifier, PID: 28565
02-06 20:37:02.008: E/AndroidRuntime(28565): java.lang.RuntimeException: Unable to start service com.dotmav.runescapenotifier.GEService@384655b5 with Intent { cmp=com.dotmav.runescapenotifier/.GEService }: java.lang.IllegalArgumentException: Unknown pattern character 'X'
02-06 20:37:02.008: E/AndroidRuntime(28565): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2881)
02-06 20:37:02.008: E/AndroidRuntime(28565): at android.app.ActivityThread.access$2100(ActivityThread.java:144)
02-06 20:37:02.008: E/AndroidRuntime(28565): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1376)
02-06 20:37:02.008: E/AndroidRuntime(28565): at android.os.Handler.dispatchMessage(Handler.java:102)
02-06 20:37:02.008: E/AndroidRuntime(28565): at android.os.Looper.loop(Looper.java:135)
02-06 20:37:02.008: E/AndroidRuntime(28565): at android.app.ActivityThread.main(ActivityThread.java:5221)
02-06 20:37:02.008: E/AndroidRuntime(28565): at java.lang.reflect.Method.invoke(Native Method)
02-06 20:37:02.008: E/AndroidRuntime(28565): at java.lang.reflect.Method.invoke(Method.java:372)
02-06 20:37:02.008: E/AndroidRuntime(28565): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
02-06 20:37:02.008: E/AndroidRuntime(28565): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
02-06 20:37:02.008: E/AndroidRuntime(28565): Caused by: java.lang.IllegalArgumentException: Unknown pattern character 'X'
02-06 20:37:02.008: E/AndroidRuntime(28565): at java.text.SimpleDateFormat.validatePatternCharacter(SimpleDateFormat.java:314)
02-06 20:37:02.008: E/AndroidRuntime(28565): at java.text.SimpleDateFormat.validatePattern(SimpleDateFormat.java:303)
02-06 20:37:02.008: E/AndroidRuntime(28565): at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:356)
02-06 20:37:02.008: E/AndroidRuntime(28565): at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:249)
02-06 20:37:02.008: E/AndroidRuntime(28565): at com.dotmav.runescapenotifier.GEService.stringToDate(GEService.java:68)
02-06 20:37:02.008: E/AndroidRuntime(28565): at com.dotmav.runescapenotifier.GEService.onStartCommand(GEService.java:44)
02-06 20:37:02.008: E/AndroidRuntime(28565): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2864)
02-06 20:37:02.008: E/AndroidRuntime(28565): ... 9 more


EDIT: onDestroy() set alarm for periodical update...

AlarmManager alarm = (AlarmManager)getSystemService(ALARM_SERVICE);
alarm.set(
AlarmManager.RTC_WAKEUP,
System.currentTimeMillis() + (1000 * 60),
PendingIntent.getService(this, 0, new Intent(this, GEService.class), 0)
);

Answer

You can't use symbol in SimpleDateFormat of your own choice. Remove "XXX" from

DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");

and everything would work fine.

Go through the list of symbols that can be used inside a SimpleDateFormat constructor. This is the documentation

Probably you are looking for "yyyy-MM-dd'T'HH:mm:ss.SSSZ"

Change your code to

DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS"); 

or

DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ"); // if timezone is required
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