android - 预期为BEGIN_ARRAY，但已STRING retrofit Android

杰森数据

[
  {
    "date": "25-09-2016",
    "_id": {
      "$oid": "57e601bbf2a9d92a445ef8a3"
    },
    "createdAt": "2016-09-24 10:01:55 +0530",
    "horoscope": [
      {
        "date": "25-09-2016",
        "sunsign": "aries",
        "horoscope": "Testing.."
      },
      {
        "date": "25-09-2016",
        "sunsign": "taurus",
        "horoscope": "Testing.."
      },
      {
        "date": "25-09-2016",
        "sunsign": "pisces",
        "horoscope": "Testing.."
      }
    ]
  }
]

HoroscopeModel.java：

public class HoroscopeModel {

    private Date date;
    private Date createdAt;
    private List<HoroscopeModel> horoscope;

    public List<HoroscopeModel> getHoroscope() {
        return horoscope;
    }

    public void setHoroscope(List<HoroscopeModel> horoscope) {
        this.horoscope = horoscope;
    }


    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    public Date getCreatedAt() {
        return createdAt;
    }

    public void setCreatedAt(Date createdAt) {
        this.createdAt = createdAt;
    }

    public List<HoroscopeModel> getHoroscopeList() {
        return horoscope;
    }

    public void setHoroscopeList(List<HoroscopeModel> horoscopeList) {
        this.horoscope = horoscopeList;
    }
}

星座运势

public class Horoscope {

    Date date;
    String sunshine;
    String horoscope;

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    public String getSunShine() {
        return sunshine;
    }

    public void setSunShine(String sunShine) {
        this.sunshine = sunShine;
    }

    public String getHoroscope() {
        return horoscope;
    }

    public void setHoroscope(String horoscope) {
        horoscope = horoscope;
    }
}

ApiInterface.java

public interface ApiInterface {

    @GET("/get_horoscope")
    Call<List<HoroscopeModel>> getHoroscope();
}

改造：

private void setupRestClient() {
    OkHttpClient.Builder client = new OkHttpClient.Builder();
    HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
    loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
    client.addInterceptor(loggingInterceptor);


    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(API_URL)
            .client(client.build())
            .addConverterFactory(GsonConverterFactory.create(getGson()))
            .build();

    REST_CLIENT = retrofit.create(ApiInterface.class);
}

private Gson getGson() {
    GsonBuilder builder = new GsonBuilder();
    builder.registerTypeAdapter(Date.class, new DateDeserializer());
    builder.setPrettyPrinting();
    return builder.create();
}

DateDeserializer.java

public class DateDeserializer implements JsonDeserializer<Date> {
    private static final String TAG = "DateDeserializer";
    private static final String[] DATE_FORMATS = new String[]{
            "yyy-MM-dd hh:mm:ss Z",//2016-09-24 08:18:56 +0530
            "dd-MM-yyyy"
    };

    @Override
    public Date deserialize(JsonElement jsonElement, Type typeOF,
                            JsonDeserializationContext context) throws JsonParseException {
        for (String format : DATE_FORMATS) {
            try {
                return new SimpleDateFormat(format, Locale.US).parse(jsonElement.getAsString());
            } catch (ParseException e) {
            }
        }
        throw new JsonParseException("Unparseable date: \"" + jsonElement.getAsString()
                + "\". Supported formats: " + Arrays.toString(DATE_FORMATS));
    }
}

一切设置正确后，它会抛出错误消息java.lang.IllegalStateException: Expected BEGIN_ARRAY but was STRING at line 1 column 183 path $[0].horoscope[0].horoscope，请告诉我我的代码中是否有任何错误。提前致谢。

最佳答案

错误消息是很不言自明的。

$[0].horoscope[0].horoscope是String，但是您正在尝试将其反序列化为List。

这是因为在HoroscopeModel中，您将horoscope定义为List<HoroscopeModel>的类型，而不是List<Horoscope>。

Gson试图将horoscope（a String）的值反序列化为horoscope（a HoroscopeModel）的List字段，而不是horoscope（a Horoscope）的String字段。

在HoroscopeModel中，更改为以下字段：

private List<HoroscopeModel> horoscope;

对此：

private List<Horoscope> horoscope;

（也不要忘记修改相应的方法）