改进POST错误

Question

我是Retrofit的新手。使用改造作为响应出错：com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected a string but was BEGIN_OBJECT at line 1 column 2 path $

所以我必须这样做：

- 请求POST

- 标题“Content-Type：application / json”

- data {“device”：{“token”：“213”，“platform”：“ios”}}

我创造了

      public class Device {

            @SerializedName("token")
            @Expose
            private String token;

            @SerializedName("platform")
            @Expose
            private String platform;

            public String getToken() {
                return token;
            }

            public void setToken(String token) {
                this.token = token;
            }

            public String getPlatform() {
                return platform;
            }

            public void setPlatform(String platform) {
                this.platform = platform;
            }

        }


    public class Example {

        @SerializedName("device")
        @Expose
        private Device device;


        public Device getDevice() {
            return device;
        }

        public void setDevice(Device device) {
            this.device = device;
        }

    }


        public interface ApiService {

            @POST("/")
            void addDevice(@Body Example example, Callback<String> callback);

        }


   private void executePostDevice() {
        RestAdapter.Builder builder = new RestAdapter.Builder()
                .setEndpoint(NetworkConstants.DEVICES_URL)
                .setRequestInterceptor(new RequestInterceptor() {
                    @Override
                    public void intercept(RequestFacade request) {
                        request.addHeader("header", "application/json");
                    }
                });
        RestAdapter restAdapter = builder.build();
        Example ex = new Example();
        Device device = new Device();
        device.setToken("test_token");
        device.setPlatform("android");
        ex.setDevice(device);
        ApiService apiService = restAdapter.create(ApiService.class);
        apiService.addDevice(ex, new Callback<String>() {
            @Override
            public void success(String s, Response response) {
            }

            @Override
            public void failure(RetrofitError error) {
            }
        });

    }