change Text if JSON Array is empty

Question

My app fetches JSON data from a server and stores them in a CardView. All the data is processed correctly, but if some data isn't available at the moment the JSONArray is empty. The app fetches them anyway and writes 'null' into the TextView, while I want to have it empty. I already searched other related questions and thought it was the best way to check the length of the array, but still it puts 'null' in my TextView:

What I get:

(null - null)

What I want to have:

( - )

This is the structure of what is fetched:

[
 {
  "MatchResults": []
 }
]

How I tried to handle it:

JSONArray jArray = json.getJSONArray("MatchResults");

for(int j=0; j<jArray.length(); j++) {

    JSONObject json_data = jArray.getJSONObject(j);

         if(jArray != null && jArray.length() > 0){
             GetDataAdapter.setTore1(json_data.getString(TEAM1));
             GetDataAdapter.setTore2(json_data.getString(TEAM2));
         }
}

What do I have to change so that the setTore1 and setTore2 method leave the TextView empty?

Why not? I cut the code of course, I hope I didn't cut anything important — user9155899
– user9155899, Commented Sep 2, 2018 at 9:40
Because the MatchResults array is empty. Or is it not the data you are working with? In that case provide an actual example. — NiVeR
– NiVeR, Commented Sep 2, 2018 at 9:41
Oh yes, of course! I didn't think about that correctly, with that hint I was able to solve it. Thank you very much! — user9155899
– user9155899, Commented Sep 2, 2018 at 9:48

NiVeR · Accepted Answer · 2018-09-02 09:49:17Z

1

The example you provided probably doesn't match the provided output, as mentioned in the comment. Anyway, what you are describing can be done by simply initializing the properties in construction phase.

I am not sure of the object that contains the properties, but those should be tore1 and tore2. Before iterating the json and try to set those, just initialize them to be empty strings ("") in this way when you don't find a valid value in the json, you will use the empty string as required.

answered Sep 2, 2018 at 9:49

NiVeR

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