从哈希数组创建JSONArray

Question

I have a Array of hash like this

[
  {"id":"1","name":"Apple","category":"fruit"},
  {"id":"2","name":"Ball","category":"toy"},
  {"id":"3","name":"Cat","category":"animal"},
  ..
  ..
  {"id":"500","name":"yoyo","category":"toy"},
  ..
]

I have a method which accepts JsonArray . How can I pass this, so that later I can search a particular type of category like toy and return its index?

Since this contains quotes, so I can't even figure out how to directly pass this as a new JsonArray().

Answer 1

Convert your JSON string into a JSONArray object like this

JSONArray jsonArray = new JSONArray(jsonString);

Use the method to find all indexes of specific category

public List<Integer> getIndexesOfCategory(JSONArray jsonArray,String category) {
        List<Integer> indexes = new ArrayList<>();

        for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject jsonObject = jsonArray.getJSONObject(i);
            if (category.equals(jsonObject.getString("category"))) {
                indexes.add(i);
            }
        }
        return indexes;
    }

Use like this

List<Integer> indexes = getIndexesOfCategory(jsonArray,"toy") ;