Android Firestore db returns value exact every seccond time

Question

i have a real strange problem. I have two methods where i parse data depending on user selected values. In my seccond method i parse those data. The seccond method returns always the right values but in my first method gets this values only every seccond time. I cannot find the issue. The list which i get from previous method is also right, so i get also all values. Here is my Code:

      mBuilder.setPositiveButton("Suche", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int which) {
                ArrayList<String> selectedCategories = new ArrayList<>();

                for (int i = 0; i < mUserItems.size(); i++) {

                    selectedCategories.add(listItems[mUserItems.get(i)]);


                }
              //  selectedCategories.add("asdf");
            getStores(selectedCategories);
            }
        });

     private void getStores(ArrayList<String> checkedItems) {

        for (int i =0; i<checkedItems.size(); i++){
        String checkedItem = checkedItems.get(i);
        getStore(checkedItem);
    }
    getDistanceToUser(sellers2);
}

    private void getStore(String checkedItem) {
        db.collection("Seller")
                .whereEqualTo("typ", checkedItem)
                .get()
                .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
                    @Override
                    public void onComplete(@NonNull Task<QuerySnapshot> task) {
                        if (task.isSuccessful()) {
                            for (QueryDocumentSnapshot document : task.getResult()) {
                                SellerObject so = document.toObject(SellerObject.class);
                                so.setId(document.getId());
                                sellers2.add(so);

                                Log.i(TAG, "onComplete: toa"+sellers.size());
                            }



                        } else {
                            Log.d(TAG, "Error getting documents: ", task.getException());
                        }
                    }
                });
    }

It's because all database queries are asynchronous and return immediately, before the data is available. But you're expecting the data in `sellers2` to be available immediately after calling getStore(). — Doug Stevenson, Jan 22 '19 at 22:09
The easiest thing is to only deal with the results of the query inside the callback for the query itself, and not anywhere outside the callback. Unless you ensure that other location is only invoked after the callback is done. — Doug Stevenson, Jan 22 '19 at 22:31
You can also check **[this](https://stackoverflow.com/questions/48499310/firestore-object-with-inner-object/48500679)** out. — Alex Mamo, Jan 23 '19 at 08:48
thanks i solved it by following @Doug Stevenson instructions — Markus Gerlach, Jan 24 '19 at 21:21

Android Firestore db returns value exact every seccond time

0 Answers0