Android Studio——由于预期的begin_array，无法从改装中获得响应，但begin_object错误

Question

我试图通过改型从openweather api获取一些数据。目前，我无法得到任何回应，因为我遇到了如下错误：

java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $

我尝试添加

这是我的代码：

应用程序编程接口

public interface ApiInterface {
@GET("/data/2.5/weather")
Call<List<ModelClass>> getForecastData(
        @Query("lat") int lat,
        @Query("lon") int lon,
        @Query("appid") String api_key);
}

波约

    public class ModelClass {
    @SerializedName("main")
    List<Main> MainData = null;

    public List<Main> getMainData() {
        return MainData;
    }

    class Main{
        @SerializedName("temp")
        double temperature;
        @SerializedName("pressure")
        int pressure;

        public double getTemperature() {
            return temperature;
        }

        public void setTemperature(double temperature) {
            this.temperature = temperature;
        }

        public int getPressure() {
            return pressure;
        }

        public void setPressure(int pressure) {
            this.pressure = pressure;
        }
    }
}

主要活动

    public class MainActivity extends AppCompatActivity {
    public static final String BASE_URL = "https://api.openweathermap.org/";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Retrofit mRetrofit = new Retrofit.Builder()
                .baseUrl(BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        ApiInterface mInterface = mRetrofit.create(ApiInterface.class);

        Call<List<ModelClass>> mForecastData = mInterface.getForecastData(
                35, 139, "API_KEY");

        mForecastData.enqueue(new Callback<List<ModelClass>>() {
            @Override
            public void onResponse(Call<List<ModelClass>> call, Response<List<ModelClass>> response) {
                if (!response.isSuccessful()) {
                    System.out.println(response.code());
                }
                Log.i(TAG, "onResponse: "+response.body());
            }

            @Override
            public void onFailure(Call<List<ModelClass>> call, Throwable t) {
                t.printStackTrace();
            }
        });
    }
}

JSON响应

    {
      "main": {
        "temp": 274.44,
        "feels_like": 274.44,
        "temp_min": 273.66,
        "temp_max": 276.7,
        "pressure": 1006,
        "humidity": 75
      }
    }

在使用接口中的getForecastData时，我传递了真正的api密钥。




Answer 1

Call<ModelClass> getForecastData

使用代码。JSON中有一个对象。