改造无数据

Question

我正在尝试从这个 api 获取数据，并在 android studio 中进行改造。 https://services5.arcgis.com/fsYDFeRKu1hELJJs/arcgis/rest/services/FOHM_Covid_19_FME_1/FeatureServer/4/query?f=geojson&where=1%3D1&outFields=%C3%85ldersgrupp&outFields=Totalt_antal_fall&outFields=Totalt_antal_avlidna

我得到的数据要么是 null 要么是 0，我不明白为什么。

这是我的界面：

 public interface apiCall {
    @GET("4/query?f=geojson&where=1%3D1&outFields=Åldersgrupp2&outFields=Totalt_antal_fall&outFields=Totalt_antal_avlidna&outFields=Totalt_antal_intensivvårdade")

    Call<apiData> getData();
}

这是我的模型

@SerializedName("Totalt_antal_avlidna")
private int death;

@SerializedName("Totalt_antal_fall")
private int cases;

@SerializedName("Totalt_antal_intensivvårdade")
private int hospital;

@SerializedName("Åldersgrupp")
private String  ageGroup;

public int getDeath() {
    return death;
}

public int getCases() {
    return cases;
}

public int getHospital() {
    return hospital;
}

public String getAgeGroup() {
    return ageGroup;
}

这是代码：

 //retrofit builder
    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("https://services5.arcgis.com/fsYDFeRKu1hELJJs/arcgis/rest/services/FOHM_Covid_19_FME_1/FeatureServer/")
            .addConverterFactory(GsonConverterFactory.create())
            .build();
    //interface
    apiCall callApi = retrofit.create(apiCall.class);
    Call<apiData> call = callApi.getData();
    call.enqueue(new Callback<apiData>() {
        @Override
        public void onResponse(Call<apiData> call, Response<apiData> response) {
            if(!response.isSuccessful()){
                test.setText("code " + response.code());
                return;
            }
            apiData trying = response.body();

                String content = "";
                content += "age group: " + trying.getAgeGroup() +"\n";
                content += "cases: " + trying.getCases() +"\n";
                content += "death: " + trying.getDeath() +"\n";
                content += "hospital: " + trying.getHospital() +"\n\n";

                test.append(content);
            }
        @Override
        public void onFailure(Call<apiData> call, Throwable t) {
            test.setText(t.getMessage());
        }
    });

Answer 1

您需要解析“FeatureCollection”，然后是“Features”，然后是实际特征。

所以你类的结构不对

修复对象的层次结构，你就会解决它

//这只是下面的伪代码，但它应该为您指明正确的方向：

@SerializedName("FeatureCollection")
class FeatureCollection{

    @SerializedName("Features")
    ArrayList<Feature> features;
}


class Feature{    
    @SerializedName("Totalt_antal_intensivvårdade")
    int hospital;

    @SerializedName("Åldersgrupp")
    String  ageGroup; 
}

改造无数据

Retrofit no data

java

api

android

retrofit