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androiditeratorrealm

Android Realm iterators exception

Android Realm, I want to code like this:

public void updateChecked(MyModel model) {
    Realm.getDefaultInstance().beginTransaction();
    model.setChecked(true);
    Realm.getDefaultInstance().commitTransaction();
}

public void updateAllChecked() {
    RealmResults<MyModel> results = Realm.getDefaultInstance().where(MyModel.class).findAll();
    for (MyModel model : results) {
        updateChecked(model);
    }
}

with error when I call updateAllChecked():

java.util.ConcurrentModificationException: No outside changes to a Realm is allowed while iterating a RealmResults. Use iterators methods instead.

How to solve it?

Solution

  • You can't change objects during iteration. You need first manually copy all objects to another list and then iterate over them

    List<MyModel> list = new ArrayList<>();
list.addAll(results);

realm.beginTransaction();
for (MyModel myModel : list){
    myModel.setChecked(true);
}
realm.commitTransaction();