Sending JSON in POST request with retrofit

Question

I've seen this questions many times and tried many solutions but without resolving my problem, I'm trying to send a json in a POST request using retrofit, I'm not an expert in programming so I may miss something obvious.

My JSON is in a string and looks like that:

{"id":1,"nom":"Hydrogène","slug":"hydrogene"}

My Interface (called APIService.java) looks like that:

@POST("{TableName}/{ID}/update/0.0")
Call<String> cl_updateData(@Path("TableName") String TableName, @Path("ID") String ID);

And my ClientServiceGenerator.java looks like that:

public class ClientServiceGenerator{
private static OkHttpClient httpClient = new OkHttpClient();

public static <S> S createService(Class<S> serviceClass, String URL) {
    Retrofit.Builder builder =
            new Retrofit.Builder()
                    .baseUrl(URL)
                    .addConverterFactory(GsonConverterFactory.create());

    Retrofit retrofit = builder.client(httpClient).build();
    return retrofit.create(serviceClass);
}}

And finally here is the code in my activity

APIService client = ClientServiceGenerator.createService(APIService.class, "http://mysiteexample.com/api.php/");
    Call<String> call = client.cl_updateData("atomes", "1");
    call.enqueue(new Callback<String>() {
        @Override
        public void onResponse(Response<String> response, Retrofit retrofit) {
            if (response.code() == 200 && response.body() != null){
                Log.e("sd", "OK");
            }else{
                Log.e("Err", response.message()+" : "+response.raw().toString());
            }
        }

        @Override
        public void onFailure(Throwable t) {
            AlertDialog alertError = QuickToolsBox.simpleAlert(EditDataActivity.this, "updateFail", t.getMessage(), new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });
            alertError.show();
        }
    });

Tell me if you need anything else, hope someone could help me.

EDIT Didn't mention it first time but my JSON won't always be with the same keys (id, nom, slug).

Oleg Khalidov · Accepted Answer · 2016-05-10T14:02:47.543

13

First you need to create an object to represent the json you need:

public class Data {
    int id;
    String nom;
    String slug;

    public Data(int id, String nom, String slug) {
        this.id = id;
        this.nom = nom;
        this.slug = slug;
    }
}

Then, modify your service to be able to send this object:

@POST("{TableName}/{ID}/update/0.0")
Call<String> cl_updateData(@Path("TableName") String TableName, @Path("ID") String ID, @Body Data data);

Finally, pass this object:

Call<String> call = client.cl_updateData("atomes", "1", new Data(1, "Hydrogène", "hydrogene"));

UPD

To be able to send any data use Object instead of Data:

@POST("{TableName}/{ID}/update/0.0")
Call<String> cl_updateData(@Path("TableName") String TableName, @Path("ID") String ID, 
        @Body Object data);

edited May 10 '16 at 14:02

answered May 10 '16 at 12:58

Oleg Khalidov

5,108
1
28
29

What if I wanted to use the same method for multiple request, without using the same types ? I mean, I can't use a class like Data cause I don't know how my datas will be, it was an example so I won't always use id, nom and slug. Is there a was to do that by using a List or something ? – Teasel May 10 '16 at 13:41
@Teasel that's not a problem. Just use `Object` instead of `Data` and pass whatever data you need – Oleg Khalidov May 10 '16 at 13:48
Sorry to bother you Sir but may I have a little example ? My brain is kinda burning right now, how do I use an Object for this ? – Teasel May 10 '16 at 13:57
@Teasel updated my answer – Oleg Khalidov May 10 '16 at 14:03
Still not working, maybe I'm doing something wrong – Teasel May 10 '16 at 14:17
what exactly isn't working? – Oleg Khalidov May 10 '16 at 14:19
Looks like my API isn't receiving any datas – Teasel May 10 '16 at 14:22
Get any exceptions on the client? – Oleg Khalidov May 10 '16 at 14:25
Yep, Error 404, it's normal cause my API is sending a 404 error when there is no result. I use this API: https://www.leaseweb.com/labs/2015/10/creating-a-simple-rest-api-in-php/ – Teasel May 10 '16 at 14:27
I don't know man, see the server logs. retrofit service looks ok – Oleg Khalidov May 10 '16 at 14:48
I'll see, thanks anyway ! I think your answer could solve most problems so I'll mark it as the good one. – Teasel May 10 '16 at 15:32
you are not allowed to vote until 15 points, but you can accept my answer so I can earn my 15 points) – Oleg Khalidov May 10 '16 at 16:07
Hey mate, just wanted to tell you that I succeeded, thank you very much for your help ! – Teasel May 11 '16 at 07:43
@Teasel glad I helped!) – Oleg Khalidov May 11 '16 at 07:49
@Teasel Can you please let me know How did you pass different values or Body object for different requests? – Ravitheja Jun 26 '17 at 10:50
It works like a charm! Thank you very much! – Marcos Guimaraes Sep 01 '17 at 13:19

Sending JSON in POST request with retrofit

1 Answers1