Parse Findinbackground Doesn't Add To Global Arraylist?

This is a snippet of my code with small edits in names. String[] items; ArrayListtempListItems; public void initList() { if(query()){ items = new

Solution 1:

String[] items;
final ArrayList<String>tempListItems;
{
    tempListItems= newArrayList<>();
}

publicvoidinitList() {
    if(query()){
        items = newString[tempListItems.size()];
        items = tempListItems.toArray(items);
        Arrays.sort(items);

        Log.d("HSearch - initList", "Generate Clean List");
        Log.d("initList - temp size", Integer.toString(tempListItems.size()));
        Log.d("initList - items size", Integer.toString(items.length));
    }
}

privatebooleanquery() {
    ParseQuery<ParseObject> query = ParseQuery.getQuery("Table");
    query.orderByAscending("name");
    query.findInBackground(newFindCallback<ParseObject>() {
        @Overridepublicvoiddone(List<ParseObject> list, com.parse.ParseException e) {
            if (e == null) {
                for (ParseObject name : list) {
                    tempListItems.add(name.getString("name"));
                }
            } else {
                Log.d("score", "Error: " + e.getMessage());
            }
        }
    });
    returntrue;
}

Changed your code, this should work, as It worked for me.

Make your methods public to use in other classes.

Solution 2:

How about creating a Handler before query.findInBackground :

Handlerhandler=newHandler();

and put the for loop inside handler.post(Runnable) :

handler.post(new Runnable(){
    @Override
    run(){
       for (ParseObject name : list)
           tempListItems.add(name.getString("name"));
    }
});

Solution 3:

As see here:

findInBackground : Retrieves a list of ParseObjects that satisfy this query from the source in a background thread.

Means findInBackground method is running on different Thread from which calling query.findInBackground method.

if I check the size of tempListItems after done() the size is not empty

Here:

if(query()){
   //....
  }

if we check size of tempListItems inside if-block then size always zero because if block is executing just after starting query.findInBackground Thread without waiting for Result of Task.

done is a callback method which is called when findInBackground executing complete on same Thread which is started it.

Solution 4:

query() will return true without waiting of done response. that's why list is empty.

put your code in done success

privatevoidquery() {
    ParseQuery<ParseObject> query = ParseQuery.getQuery("Table");
    query.orderByAscending("name");
    query.findInBackground(newFindCallback<ParseObject>() {
        @Overridepublicvoiddone(List<ParseObject> list, com.parse.ParseException e) {
            if (e == null) {
                for (ParseObject name : list) {
                    tempListItems.add(name.getString("name"));
                }

                items = newString[tempListItems.size()];
                items = tempListItems.toArray(items);
                Arrays.sort(items);

                Log.d("HSearch - initList", "Generate Clean List");
                Log.d("initList - temp size",
                        Integer.toString(tempListItems.size()));
                Log.d("initList - items size",
                        Integer.toString(items.length));
            } else {
                Log.d("score", "Error: " + e.getMessage());
            }
        }
    });
}