从本地数据存储解析查询后发生错误

Question

I'm using Parse.com library and I want to query from local datastore if user lost access to internet (query on pinned items from previous app usage). Problem is that if use offline query it will not return List<Object> but weird AbstractList and I don't know how to convert it to ArrayList.

Anyone had this issue?

API call:

fun getFilteredObjects(c: Context, searchQuery: String?, filteredObjectsCallback: (ArrayList<ParseObject>?, ParseException?) -> Unit){
            val q = ParseQuery.getQuery<ParseObject>(OBJECT_CLASS)
            if (!isOnline(c)) q.fromLocalDatastore()

            if (searchQuery.isNullOrEmpty()){
                q.limit = 10
            } else {
                q.whereMatches(OBJECT_NAME, searchQuery, "i")
            }

            q.findInBackground { objectList, err ->
                filteredObjectsCallback(objectList as ArrayList<ParseObject>?, err)
            }
        }

Error line: filteredObjectsCallback(objectList as ArrayList<ParseObject>?, err)

Error:

java.lang.ClassCastException: java.util.AbstractList$SubAbstractListRandomAccess cannot be cast to java.util.ArrayList

Answer 1

Your cast is invalid because types are not convertible: objectList is of type AbstractList and that cannot be hard casted to ArrayList like that.

Instead, use Arrays.asList(objectList) , I think it has its own implementation and translates the abstract list.