改造Json对Gson Android Kotlin / Java的动态响应

Question

I have dynamic json format from rest API like this :

{
    "data": {
        "response_code": "success",
        "value": {
            "Table": [
                {
                    "id": 5,
                    "username": "blahblah",
                    "password": "blahblah",
                    "role": 2,
                    "email": "blah@tes.com",
                    "tanggal_buat": "2019-01-01T00:00:00"
                }
            ]
        }
    },
    "meta": {
        "http_status": 200
    }
}

Object "value" has an object array name "Table". Table can contain value from my database dynamically depend on my query. So, Sometimes the json format will change for example :

{
    "data": {
        "response_code": "success",
        "value": {
            "Table": [
                {
                    "id_product": 44,
                    "product": "blahblah",
                    "lot": "blahblah",
                    "qty": 2,
                }
            ]
        }
    },
    "meta": {
        "http_status": 200
    }
}

How to accept the json value and assign to gson directly with different subclass of "Table"

I try it in retrofit and using kotlin

override fun onResponse(call: Call<MainResp>, response: Response<MainResp>) {
                    mainResponse : MainResp = response.body()
                }

Answer 1

Assuming that you have the following class among others (using sth like http://www.jsonschema2pojo.org/ ):

class Value {
    List<Table> tables;
}

The "Table" class here cannot be completely random!
You'll need to define the possible types of "Table" eg Table1, Table2... TableN.

Now you can update Value class with a generic type T instead of Table and write your custom type adapter:

class Value {
    List<T> tables;
} 

One of the tutorials on how to write your own type adapter is here .