Android JSONArrays inside JSONArray

Question

Here's the relevant part of my json file:

"categories": [
     [
         "Belgian Restaurant", 
         "belgian"
     ], 
     [
         "Brasserie", 
         "brasseries"
     ]
 ],

What i want to do is retrieve informations from the second JSONArray (let's say "brasseries" for example).

The following code worked for retrieving informations from the first array:

JSONArray categories = jsonObject.getJSONArray("categories");
restaurant.setCat1(categories.getJSONArray(0).getString(1));

The result of this was "belgian" as expected, but then i tryed the same for the second array:

restaurant.setCat2(categories.getJSONArray(1).getString(1));

and that threw a Index 1 out of range [0..1) JSONException

I don't get it since indexes 0 and 1 clearly exist in the file ... Why would 0 work and not 1 ?

I am pretty sure there is nothing wrong in code which you have posted. May be something else is causing the issue. — Vipul
– Vipul, Commented Feb 1, 2016 at 15:39
I don't know what then, it's the first time i deal with such nested JSONArrays — clems36
– clems36, Commented Feb 1, 2016 at 15:41
I assume there is some context around "categories". Are you sure that you are in the correct JSONObject (e.g. have you logged categories)? — toKrause
– toKrause, Commented Feb 1, 2016 at 15:43
@clementino36, try this restaurant.setCat2(categories.getJSONArray(0).getString(1)); — Pankaj Nimgade
– Pankaj Nimgade, Commented Feb 1, 2016 at 15:56

Pankaj Nimgade · Accepted Answer · 2016-02-01 16:53:29Z

2

the problem is that there is a array inside another array without a name, your error can be ignored like this,

restaurant.setCat2(categories.getJSONArray(0).getString(1));

before coding for any JSON data, you should always check if it is right,

as JSON in the question is lacking the KEY's for the different values that you want to iterate,

it would be difficult to get the information if the inner object change it's incessant variables, (any increase or decrease will lead to erroneous result).

try to generate JSON with key-value pair,

Example

{
  "categories": [
    {
      "id": "00",
      "name": "Some_name_0"
    },
    {
      "id": "01",
      "name": "Some_name_1"
    },
    {
      "id": "02",
      "name": "Some_name_2"
    },
    {
      "id": "03",
      "name": "Some_name_3"
    },
    {
      "id": "04",
      "name": "Some_name_4"
    }
  ]
}

edited Feb 1, 2016 at 16:53

answered Feb 1, 2016 at 15:45

Pankaj Nimgade

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3 Comments

clems36 Over a year ago

I will try that eventhough i don't get why i can Log the data without problem but can't use it. Thanks for answering :)

Pankaj Nimgade Over a year ago

@clementino36, you may want to write this restaurant.setCat2(categories.getJSONArray(0).getString(1));

Pankaj Nimgade Over a year ago

@clementino36, Thank you, it is appreciated, Good day to you !

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