Question

我目前正在研究改造2并遇到了一个问题。

我正在使用免费的api

$(function() {
  var pressed, pressX, pressY,
      dragged,
      offset = 3; // helps detect when the user really meant to drag

  $(document)
  .on('mousedown', '.thing', function(e) {
    pressX = e.pageX;
    pressY = e.pageY;
    pressed = true;
  })
  .on('mousemove', '.thing', function(e) {
    if (!pressed) return;
    dragged = Math.abs(e.pageX - pressX) > offset ||
              Math.abs(e.pageY - pressY) > offset;
  })
  .on('mouseup', function() {
    dragged && console.log('Thing dragged');
    pressed = dragged = false;
  });
});

以下是我的POJO

RestResponse

http://services.groupkt.com/country/get/all

结果

public class RestResponse {

    @SerializedName("messages")
    @Expose
    private List<String> messages;
    @SerializedName("result")
    @Expose
    private List<Result> result;

    public List<String> getMessages() {
        return messages;
    }

    public void setMessages(List<String> messages) {
        this.messages = messages;
    }

    public List<Result> getResult() {
        return result;
    }

    public void setResult(List<Result> result) {
        this.result = result;
    }

}

ApiInterface

public class Result {

    @SerializedName("name")
    @Expose
    private String name;
    @SerializedName("alpha2_code")
    @Expose
    private String alpha2Code;
    @SerializedName("alpha3_code")
    @Expose
    private String alpha3Code;

    public String getName() {
        return name;
    }

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

    public String getAlpha2Code() {
        return alpha2Code;
    }

    public void setAlpha2Code(String alpha2Code) {
        this.alpha2Code = alpha2Code;
    }

    public String getAlpha3Code() {
        return alpha3Code;
    }

    public void setAlpha3Code(String alpha3Code) {
        this.alpha3Code = alpha3Code;
    }
}

MainActivity

public interface ApiInterface {

    @GET("country/get/all")
    Call<RestResponse> getCountry();

}

改造调用onResponse回调，但是当我试图从response.body（）获取结果时，它返回null。我该如何解决这个问题？

Answer 1

因此，您需要一个不同的类来保存RestResponse，因为您获得的Json响应具有第一级对象RestResponse，然后该类是您拥有的类。 / p>

所以你需要这样的东西：

public class CountryResponse {

    @SerializedName("RestResponse")
    @Expose
    private RestResponse restResponse;

    public RestResponst getRestResponse() { return restResponse; }
    public void setRestResponse(RestResponse restResp) {restResponse = restResp; }
}

您只需将API调用行更改为：

ApiInterface apiService = ApiClient.getmRetrofitClient().create(ApiInterface.class);
    Call< CountryResponse > call = apiService.getCountry();
    call.enqueue(new Callback< CountryResponse >() {
        @Override
        public void onResponse(Call<CountryResponse> call, Response<CountryResponse> response) {
            List<Result> results = response.body().getRestResponse().getResult();
        }

        @Override
        public void onFailure(Call< CountryResponse > call, Throwable t) {
            Log.e("onFailure", t.getMessage());
        }
});

试试这个，这应该有效。

Retrofit 2在其成员变量上返回null

1 个答案: