java.lang.NoSuchMethodError: No interface method sort(Ljava/util/Comparator;) exception in sorting arraylist android

Question

I\'m trying to sort an ArrayList in Java in Android app but I\'m getting this weird exception.

Code:

eventsList.sort(new Comparator<         


        

Answer 1

Zxing?

If you get this error in the Zxing core lib in com.google.zxing.qrcode.detector.FinderPatternFinder.selectBestPatterns you can solve it by downgrading Zxing to 3.3.x (3.3.3 currently).

See https://github.com/zxing/zxing/issues/1170 for details.

Answer 2

ArrayList#sort() was added in API level 24 and runtimes below API level 24 don't have that method. Looks like your compileSdkVersion is at 24 so you got the code to compile in the first place.

Use Collections.sort(list, comparator) instead.

Answer 3

What if you try

Collections.sort(eventsList, new Comparator...

As far as I know ArrayList doesn't have sort method.

Answer 4

List doesn't have its own sorting method, you'll need to call

Collections.sort() 

as the method on the list. If this returns a ClassCastError, that means the list has non-sortable items. I think this should fix it, but without full code, it's hard to check.

Answer 5

ArrayList.sort() method was added later that's why its not working. We can update java version (1.8) or we can use below method.

Collections.sort(eventList, new Comparator<Event>() {
        @Override
        public int compare(Event event, Event t1) {
            return event.getEventStartDate().compareTo(t1.getEventStartDate());
        }
});