How to send JSON data as Body using Retrofit android

Question

I am trying to post below JSON array on server.

{
    \"order\": [{
            \"orderid\": \"39\",
            \"dishid\": \"54\",
            \"quantity\"         


        

Answer 1

Create OrderRequest Class

public class OrderRequest {

@SerializedName("order")
public List orders;
}

create Order Class

    public class Order {

    @SerializedName("orderid")
    public String Id;
}

EndPoint

public interface ApiEndpoint{
  @POST("order")
  Call createOrder(@Body OrderRequest order, @HeaderMap HashMap headerMap);
}

Use this type of implementation in the mainActivity which call to service

HashMap hashMap= new HashMap();
    hashMap.put("Content-Type","application/json;charset=UTF-8");

OrderRequest orderRequest = new OrderRequest();
List orderList = new ArrayList();

Orders order = new Order();
order.Id = "20";
orderList.add(order);
//you can add many objects

orderRequest.orders = orderList;

Call dataResponse= apiEndPoint.createOrder(orderRequest,hashMap)
dataResponse.enqueue(new Callback() {
        @Override
        public void onResponse(Call call, Response response) {
            try{

            }catch (Exception e){

            }
        }   

In the createOrder method we donot need to convert object into Json. Because when we build retrofit we add converter factory as a GsonConverterFactory. It will automatic convert that object to the JSON

 retrofit = new Retrofit.Builder()
                .baseUrl(BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .build();