How to match when array is null

Question

This is my code.

                    JSONObject jsono = new JSONObject(response);
                        JSONArray jarray = jsono.getJSONArray("restaurents");

                        if(!jarray.equals("null")) {
                            //District value is not null

                            Toast.makeText(getContext(), "not null", Toast.LENGTH_LONG).show();
                        }else {
                            Toast.makeText(getContext(), " null", Toast.LENGTH_LONG).show();
                        }

And this is my json responce.

{ "status": "success", "restaurents": null }

Possible duplicate of [Test if getJSONArray is null or not](https://stackoverflow.com/questions/7110066/test-if-getjsonarray-is-null-or-not) — AskNilesh, Feb 07 '18 at 08:36

score 2 · Answer 1 · edited Feb 07 '18 at 08:41

2

if(jarray != null){
      Toast.makeText(getContext(), "not null", Toast.LENGTH_LONG).show();

}else{
      Toast.makeText(getContext(), " null", Toast.LENGTH_LONG).show();
}

edited Feb 07 '18 at 08:41

Vidhi Dave

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answered Feb 07 '18 at 08:37

Tarun konda

1,740
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not getting toast when array is null – Shreyansh Shrivastava Feb 07 '18 at 09:23
then cursor is not going to this line – Tarun konda Feb 07 '18 at 09:24
solution ? i have tried almost everything i cud do. – Shreyansh Shrivastava Feb 07 '18 at 09:27
can u show the code – Tarun konda Feb 07 '18 at 09:33
JSONObject jsono = new JSONObject(response); JSONArray jarray = jsono.getJSONArray("restaurents"); if(jarray != null){ rcview.setVisibility(View.VISIBLE); tvempty.setVisibility(View.GONE);else{ rcview.setVisibility(View.GONE); tvempty.setVisibility(View.VISIBLE); } – Shreyansh Shrivastava Feb 07 '18 at 09:57

duggu · Answer 2 · 2018-02-07T08:56:42.623

1

JsonArray return object and you are treating jArray as String. So you need to treat jArray as object:-

if(jarray != null ) {
    Toast.makeText(getContext(), "not null", Toast.LENGTH_LONG).show();
}else {
    Toast.makeText(getContext(), " null", Toast.LENGTH_LONG).show();
}

edited Feb 07 '18 at 08:56

answered Feb 07 '18 at 08:37

duggu

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not getting toast when array is null – Shreyansh Shrivastava Feb 07 '18 at 09:24
what error it shows? – duggu Feb 07 '18 at 09:27
There are no error but else part is not executing – Shreyansh Shrivastava Feb 07 '18 at 09:32
can u show the code – Tarun konda Feb 07 '18 at 09:32

Anil · Answer 3 · 2018-02-07T09:28:00.023

0

Currently u are checking like this

if(!jarray.equals("null"))

where it treats "null" as string so remove " "

Try like this

if(!jarray.equals(null))

or try like this

if (jarray.length() ==0 )

check the size of array

edited Feb 07 '18 at 09:28

answered Feb 07 '18 at 08:36

Anil

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i have checked in both conditions – Shreyansh Shrivastava Feb 07 '18 at 09:24

How to match when array is null

3 Answers3