Retrieving values stored in array in Parse and displaying them in the listView

Question

So I'm trying to retrieve the values stored in the PrescriptionArray column in Parse, which is an Array. I then want to display these values in the ListView lvPrescriptions. Any help would be greatly appreciated!!

  ParseQuery<ParseObject> query = ParseQuery.getQuery("PrescriptionObject");
    query.whereEqualTo("MedicalID", etMedicalID.getText().toString());
    query.findInBackground(new FindCallback<ParseObject>() {
        public void done(List<ParseObject> prescriptionList, ParseException e) {

            if (e == null) {

                final List<String> arrayprescription = new ArrayList<String>();

                for (int i = 0; i < prescriptionList.size(); i++) {
                    ParseObject p = prescriptionList.get(i);
                    if (p.getList("PrescriptionArray") != null) {


                        arrayprescription.addAll(Arrays.asList("PrescriptionArray"));
                        ArrayAdapter adapter = new ArrayAdapter(PrescriptionsArrayActivity.this, android.R.layout.simple_list_item_1, arrayprescription);
                        lvPrescriptions.setAdapter(adapter);
                    }

Don't you think you have to call setAdapter function on UI thread. And why you are calling setAdapter in For Loop. — Naeem, Jan 20 '16 at 15:09
Thanks Naheem I didn't spot that.. What do you mean by on UI thread? Is this a seperate Activity?? — Ógie Murphy, Jan 20 '16 at 16:48

score 0 · Answer 1 · answered Jan 20 '16 at 15:25

Try moving the setting of the listview and adapter outside of the parse query and then adding each item to the adapter. Also, do not know why you are creating/setting a list in the query.

ArrayAdapter adapter = new ArrayAdapter(PrescriptionsArrayActivity.this, android.R.layout.simple_list_item_1, arrayprescription);
lvPrescriptions.setAdapter(adapter);    

        ParseQuery<ParseObject> query = ParseQuery.getQuery("PrescriptionObject");
            query.whereEqualTo("MedicalID", etMedicalID.getText().toString());
            query.findInBackground(new FindCallback<ParseObject>() {
                public void done(List<ParseObject> prescriptionList, ParseException e) {

                    if (e == null) {

                        final List<String> arrayprescription = new ArrayList<String>();

                        for (int i = 0; i < prescriptionList.size(); i++) {
                            ParseObject p = prescriptionList.get(i);

    adapter.add(stateList.get(i));




                            }

Thanks very much I almost have it working!! However it seems to be displaying the column name "PrescriptionArray" as oppose to the contents of the array... Any suggestions? — Ógie Murphy, Jan 20 '16 at 16:47
If you need to get a different column, you can either create a custom adapter or populate the list from your returned list of objects... p.get("something"). — AndroidDev21921, Jan 21 '16 at 00:52

Daniel López · Answer 2 · 2016-01-21T09:38:35.897

public void done (List < ParseObject > prescriptionList, ParseException e){
    if (e == null) {
        final List<String> arrayprescription = new ArrayList<String>();
        for (ParseObject p : prescriptionList) {
            if (p.getList("PrescriptionArray") != null) {
                for(Prescription prescriptionObject: p.getList("PrescriptionArray")) {
                    arrayprescription.add(prescriptionObject.getPropertyName());
                }
            }
        }
        ArrayAdapter adapter = new ArrayAdapter(PrescriptionsArrayActivity.this, android.R.layout.simple_list_item_1, arrayprescription);
        lvPrescriptions.setAdapter(adapter);
    }
}

Note that PrescriptionArrayshould contain a list of objects where you can access to their properties using getter methods of the object (or getting properties directly if its a Json), then because you are using an ArrayAdapter and not creating your own, you have to populate the ArrayAdapter data with String objects.

Thanks very much I almost have it working!! However it seems to be displaying the column name "PrescriptionArray" as oppose to the contents of the array... Any suggestions? — Ógie Murphy, Jan 20 '16 at 16:45
You have to create your custom adapter or access to a property of your `PrescriptionArray` object. I will edit my answer, using `propertyName` as the object property you want to show — Daniel López, Jan 21 '16 at 09:33

Retrieving values stored in array in Parse and displaying them in the listView

2 Answers2