Is there a way to store data values from firestore into an array?

Question

I am trying to get data in a two specific field in each document where one field is a integer and the other is a string. I want each field to be stored in an array separately.

 db.collection("Activity")
                .whereEqualTo("plan_id", plan_id)
                .get()
                .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
                    @Override
                    public void onComplete(@NonNull Task<QuerySnapshot> task) {
                        if (task.isSuccessful()) {
                            List<Long> progressList = new ArrayList<>();
                            List<String> titleList = new ArrayList<>();
                            for (QueryDocumentSnapshot document : task.getResult()) {
                                Log.d(TAG, document.getId() + " => " + document.get("progress"));

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

I've tried

int[] prog = (int[]) document.get("progress");
String[] title = (String[]) document.get("title");

but no luck...

Do you want to store those data values into Array or List? Because I saw there were 2 declarations of List for progress and title, respectively. — LHCHIN
– LHCHIN, Commented Oct 28, 2019 at 0:53

LHCHIN · Accepted Answer · 2019-10-28 01:36:02Z

1

I am not familiar with Firestore, but it seems that the QueryDocumentSnapshot is similar to Map<String, Object>. Following code snippet shows how to store those values into List as declared in your code - progressList and titleList, respectively.

List<int> progressList = new ArrayList<>();
List<String> titleList = new ArrayList<>();
for (QueryDocumentSnapshot document : task.getResult()) {
    progressList.add(Integer.valueOf(document.get("progress").toString()));
    titleList.add(document.get("title").toString());
}

And if you still want to use Array to store values, you can use API ArrayList.toArray() as follows:

int[] prog = new int[progressList.size()];
prog = progressList.toArray(prog);

String[] title = new String[titleList.size()];
title = titleList.toArray(title);

answered Oct 28, 2019 at 1:36

LHCHIN

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