Error uploading a file using Retrofit 2

Question

I\'m trying to upload a file (picture) to the server using Retrofit 2. I\'m following that tutorial which seems pretty easy at first, but didn\'t work in my case...

Answer 1

The Exceptions says that the first @Part doesn't needs a name in the annotation.

@Multipart
@POST(Constants.URL_UPLOAD)
Call<ResponseBody> upload(@Part RequestBody description,
                          @Part MultipartBody.Part file);

Answer 2

I fix my issue using this link : https://github.com/square/retrofit/issues/1063#issuecomment-145920568

This is the solution of the problem:

@Multipart
@POST ("/api/Events/editevent")
Call<Event> editEvent (@PartMap Map<String, RequestBody> params);

I call it by following way.

Map<String, RequestBody> map = new HashMap<>();
map.put("Id", AZUtils.toRequestBody(eventId));
map.put("Name", AZUtils.toRequestBody(titleView.getValue()));

if (imageUri != null) {
      File file = new File(imageUri.getPath());
      RequestBody fileBody = RequestBody.create(MediaType.parse("image/png"), file);
      map.put("file\"; filename=\"pp.png\"", fileBody);
}

Call<Event> call = api.editEvent(map);
call.enqueue(new Callback<Event>() { }

The method toRequestBody just converts String into RequestBody

public static RequestBody toRequestBody (String value) {
    RequestBody body = RequestBody.create(MediaType.parse("text/plain"), value);
    return body ;
}