java.util.ConcurrentModificationException android after remove elements from array list

问题

I have the folloing code in my android app:

/**
 * callback executed after fetching the data.
 */
public void OnPointsFetch(ArrayList<Shop> result) {

    toggleLoader(false);

    this.shops = result;

    if(activeFilter == Constants.POINTS_FILTER_AVAILABLE){
        for(Shop s : result){
            if(s.getClientPoints().getPointsAvailable() == 0){
                this.shops.remove(s);
            }
        }
    }
    else{
        for(Shop s : result){
            if(s.getClientPoints().getPointsSpent() == 0){
                this.shops.remove(s);
            }   
        }
    }


    ptsListAdapter.setCollection(this.shops);
    ptsListAdapter.setFilter(this.activeFilter);

}

This method is called on the result of an async task. I need to remove some elements of the collection before passing to the list adapter.

    11-23 17:39:59.760: E/AndroidRuntime(19777): java.util.ConcurrentModificationException
11-23 17:39:59.760: E/AndroidRuntime(19777):    at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:569)

回答1:

You can't remove items from a list while iterating over it. You need to use an iterator and its remove method:

for(Iterator<Shop> it = result.iterator(); it.hasNext();) {
    Shop s = it.next();
    if(s.getClientPoints().getPointsSpent() == 0) {
        it.remove();
    }   
}

回答2:

You get this error typically when

You modify the collection directly while it is iterating over the collection

or even worse when
one threads modifies the collection, while another iterates over it.

回答3:

Not sure if the accepted answer would work, as internally it would be trying to again modify the same list. A cleaner approach would be to maintain a 'deletion' list, and keep adding elements to that list within the loop. Once we are ready with the deletion list, they can be removed after the loop. This should work in all cases where we do not need the deleted element to be reprocessed. If yes, then the existing deletion list can be checked for presence of that element.

    List<String> list = new ArrayList<String>();
    List<String> listRemove = new ArrayList<String>();

    list.add("1");
    list.add("2");
    list.add("3");
    list.add("4");
    list.add("5");
    list.add("6");
    list.add("7");
    list.add("8");

    System.out.println("list : " + list);

    for (String i : list) {
        if (i.equals("2")) {
            listRemove.add(i);
        }
    }
    list.removeAll(listRemove);
    System.out.println("updated list: " + list);

来源：https://stackoverflow.com/questions/13533715/java-util-concurrentmodificationexception-android-after-remove-elements-from-arr

标签

android

exception

arraylist

java.util.concurrent