Android parse JSON array of array

Question

I have JSON code like above, as a response:

"candidates": [
{
  "subtest1": "0.802138030529022",
  "enrollment_timestamp": "1416850761"
},
{
  "elizabeth": "0.802138030529022",
  "enrollment_timestamp": "1417207485"
},
{
  "elizabeth": "0.777253568172455",
  "enrollment_timestamp": "1416518415"
},
{
  "elizabeth": "0.777253568172455",
  "enrollment_timestamp": "1416431816"
}
]

I try to get names from candidates array.

  public void dataCheck(String text){
    System.out.println("JSON response:");
    System.out.println(text);

    try {
        JSONObject jsonRootObject = new JSONObject(text);
        JSONArray jsonArray = jsonRootObject.optJSONArray("candidates");

        for(int i=0; i < jsonArray.length(); i++){
            JSONObject jsonObject = jsonArray.getJSONObject(i);

            String subtest1 = jsonObject.optString("subtest1").toString();

        }
    } catch (JSONException e){
        e.printStackTrace();
    }

}

It is hard, because these values are in an array of an array and without identifier. Identifier is the exact value, so couldn't define variable in my code. I need only first value, like subtest1 in this example.

I don't see an array in an array. I see JSONObjects in an JSONArray — ligi
– ligi, Commented Apr 16, 2016 at 15:35
@ligi: Sorry, I've interpret candidates' attributes as another arrays. — plaidshirt
– plaidshirt, Commented Apr 16, 2016 at 15:38

Tom Sabel · Accepted Answer · 2016-04-16 16:01:37Z

1

// Get the keys in the first JSON object
Iterator<?> keys = jsonObject.keys();
if (keys.hasNext()) {
    // Get the key
    String key = (String)keys.next();
    String objValue = jsonObject.getString(key);
    ...
}

edited Apr 16, 2016 at 16:01

answered Apr 16, 2016 at 15:40

Tom Sabel

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5 Comments

plaidshirt Over a year ago

But these variable names are given by response. I cannot define them programatically.

plaidshirt Over a year ago

I should get 'subtest1', as the value of a String.

Tom Sabel Over a year ago

See mine updated answer. First, get all keys. If there is a key, get the value of that key. If you also want other keys and values you can replace if with while.

plaidshirt Over a year ago

I think this should use jsonRootObject without the for loop according to my code.

plaidshirt Over a year ago

But in this case how can it identify candidates array? That should look for key-value pairs in this array.

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