Error: No Retrofit Annotation Found. (parameter #2)

I have this Interface: public interface InterfazAguaHttp { @FormUrlEncoded @POST('/') Call saveContador(@Field('contador') Long contador, Callback call

Solution 1:

change your interface method to this

publicinterfaceInterfazAguaHttp {

@FormUrlEncoded@POST("/")
Call<String> saveContador(@Field("contador") Long contador);
}

and the rest of the code like this

Retrofit builder = newRetrofit.Builder()
                            .baseUrl(ValoresGlobales.urlServlet)
                            .addConverterFactory(GsonConverterFactory.create())
                            .build();
                    InterfazAguaHttp interfaz = builder.create(InterfazAguaHttp.class);
                        Call<String> respuesta = interfaz.saveContador(93847597L);
                        respuesta.enqueue(newCallback<String>() {
                            @OverridepublicvoidonResponse(Response<String> response, Retrofit retrofit) {
                                //Some logging
                            }

                            @OverridepublicvoidonFailure(Throwable t) {
                                //Some logging
                            }
                        });

Link for reference