private boolean checkIdx(final int... idxs) {
        for (int idx : idxs) {
            if (idx < 0 || idx >= getItemCount()) {
                return false;
            }
        }
        return true;
    }
the debug string is used for debug and test purposes. Changing it may break some Unit-Tests
main/src/main/java/cgeo/geocaching/ui/recyclerview/ManagedListAdapter.java