Question

我正在制作一个天气应用程序，但是当我运行代码时，我得到了一个空白屏幕。

下面是我的ApiService类，在其中传递了用于改装的参数。

public interface ApiService {
    @GET("/v1/search.json?key=af3b893252df43f8a9e165152182908&q")
     Call<Weather> getWeather(
            @Query("key") String mKey,
            @Query("q") String mCityName);

}

下面是我声明了url的WeatherClient.java类

public class WeatherClient {

    private static final String ROOT_URL = "https://api.apixu.com";

    /**
     * Get Retrofit Instance
     */
    private static Retrofit getRetrofitInstance() {
        return new Retrofit.Builder()
                .baseUrl(ROOT_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .build();
    }

    /**
     * Get API Service
     *
     * @return API Service
     */
    public static ApiService getApiService() {
        return getRetrofitInstance().create(ApiService.class);
    }
}

我正在跟踪异常 java.lang.IllegalStateException：应为BEGIN_OBJECT，但在第1行第2列路径$

处为BEGIN_ARRAY

below my Weather.java Pojo class

public class Weather {

    @SerializedName("id")
    @Expose
    private Integer id;
    @SerializedName("name")
    @Expose
    private String name;
    @SerializedName("region")
    @Expose
    private String region;
    @SerializedName("country")
    @Expose
    private String country;
    @SerializedName("lat")
    @Expose
    private Double lat;
    @SerializedName("lon")
    @Expose
    private Double lon;
    @SerializedName("url")
    @Expose
    private String url;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getRegion() {
        return region;
    }

    public void setRegion(String region) {
        this.region = region;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public Double getLat() {
        return lat;
    }

    public void setLat(Double lat) {
        this.lat = lat;
    }

    public Double getLon() {
        return lon;
    }

    public void setLon(Double lon) {
        this.lon = lon;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

}

below my json response

[
    {
        "id": 803267,
        "name": "Paris, Ile-de-France, France",
        "region": "Ile-de-France",
        "country": "France",
        "lat": 48.87,
        "lon": 2.33,
        "url": "paris-ile-de-france-france"
    },
    {
        "id": 790830,
        "name": "Les Batignolles, Ile-de-France, France",
        "region": "Ile-de-France",
        "country": "France",
        "lat": 48.88,
        "lon": 2.32,
        "url": "les-batignolles-ile-de-france-france"
    },
    {
        "id": 760995,
        "name": "Batignolles, Ile-de-France, France",
        "region": "Ile-de-France",
        "country": "France",
        "lat": 48.88,
        "lon": 2.32,
        "url": "batignolles-ile-de-france-france"
    },
    {
        "id": 813415,
        "name": "Saint-Merri, Ile-de-France, France",
        "region": "Ile-de-France",
        "country": "France",
        "lat": 48.85,
        "lon": 2.35,
        "url": "saint-merri-ile-de-france-france"
    },
    {
        "id": 805471,
        "name": "Port De La Villette, Ile-de-France, France",
        "region": "Ile-de-France",
        "country": "France",
        "lat": 48.88,
        "lon": 2.37,
        "url": "port-de-la-villette-ile-de-france-france"
    },
    {
        "id": 761826,
        "name": "Belleville-Villette, Ile-de-France, France",
        "region": "Ile-de-France",
        "country": "France",
        "lat": 48.88,
        "lon": 2.37,
        "url": "belleville-villette-ile-de-france-france"
    },
    {
        "id": 787420,
        "name": "La Villette, Ile-de-France, France",
        "region": "Ile-de-France",
        "country": "France",
        "lat": 48.88,
        "lon": 2.37,
        "url": "la-villette-ile-de-france-france"
    },
    {
        "id": 822578,
        "name": "Villette, Ile-de-France, France",
        "region": "Ile-de-France",
        "country": "France",
        "lat": 48.88,
        "lon": 2.37,
        "url": "villette-ile-de-france-france"
    },
    {
        "id": 778641,
        "name": "Grenelle, Ile-de-France, France",
        "region": "Ile-de-France",
        "country": "France",
        "lat": 48.85,
        "lon": 2.3,
        "url": "grenelle-ile-de-france-france"
    },
    {
        "id": 813697,
        "name": "Saint-Ouen-Sur-Seine, Ile-de-France, France",
        "region": "Ile-de-France",
        "country": "France",
        "lat": 48.9,
        "lon": 2.33,
        "url": "saint-ouen-sur-seine-ile-de-france-france"
    }
]

Answer 1

您将获得Weather的Json数组，而不是Json对象。更改方法中的返回类型。

public interface ApiService {
    // You don't need to explicitly pass ``key`` and ``q``. These query params will be added by retrofit automatically.
    @GET("/v1/search.json")
     // return type is List<Weather>
     Call<List<Weather>> getWeather(
            @Query("key") String mKey,
            @Query("q") String mCityName);

}

我屏幕变白了

1 个答案: