{
 item:[
     {
      item_id: 1
      add_on:[
             {
             name: Thin Crust
             },

             {
             name: Extra Cheese
             },
             
             {
             name: Extra Sauce
             }

     }]
}

I want to get these names and place them into one TextView

CodePudding user response：

First of all include the JSON Library in your project.

Then access your JSON Object like this:

JSONObject jsonObject = new JSONObject(jsonString); // here is your JSON as String

// Get your Json Array of item

JSONArray itemArray = jsonObject.getJSONArray("item");

// Get your first Element from your array 

JSONObject firstItem = itemArray.getJSONObject(0);

// Then get your add_on array

JSONArray itemArray = firstItem.getJSONArray("add_on");

// After you get your array Get your second object which is { name: Extra Cheese}

JSONObject secondObject = itemArray.getJSONObject(1);

// Then you get your itemName this way:

String itemName = secondObject.getString("name");

CodePudding user response：

First of all you need to correct to JSON input. It's not valid JSON. Correct JSON should be :

{
    "item": [{
        "item_id": 1,
        "add_on": [{
                "name": "Thin Crust"
            },

            {
                "name": "Extra Cheese"
            },

            {
                "name": "Extra Sauce"
            }
        ]
    }]
}

After that with Jackon library you can get the data from Json in POJO as below:

POJO(s):

class Items {

  @JsonProperty("item")
  public List<Item> item;
}

class Item {

  @JsonProperty("item_id")
  public int itemId;

  @JsonProperty("add_on")
  public List<Name> addOn;
}

class Name {

  @JsonProperty("name")
  public String name;
}

Conversion with Jackson:

public static void main(String[] args) throws JsonMappingException, JsonProcessingException {
    String json = "{\r\n"   
        "  \"item\": [{\r\n"   
        "    \"item_id\": 1,\r\n"   
        "    \"add_on\": [{\r\n"   
        "        \"name\": \"Thin Crust\"\r\n"   
        "      },\r\n"   
        "\r\n"   
        "      {\r\n"   
        "        \"name\": \"Extra Cheese\"\r\n"   
        "      },\r\n"   
        "\r\n"   
        "      {\r\n"   
        "        \"name\": \"Extra Sauce\"\r\n"   
        "      }\r\n"   
        "    ]\r\n"   
        "  }]\r\n"   
        "}";
    
    Items item = (new ObjectMapper()).readValue(json, Items.class);
    System.out.println(item);

  }

Now from this object structure you can get names.