java - 将 GeoJson 转换为 mapbox Polygon 对象 (Android)

Question

我有一个来自服务器的 json 响应，其中包含 GeoJson 格式的多边形信息，如下所示:

{
"status": "success",
"location": {
                "type": "Polygon",
                "coordinates": [
                    [
                        [
                            50.83657264709473,
                            35.602881307254144
                        ],
                        [
                            50.86541175842285,
                            35.602881307254144
                        ],
                        [
                            50.86541175842285,
                            35.61676761271693
                        ],
                        [
                            50.83657264709473,
                            35.61676761271693
                        ],
                        [
                            50.83657264709473,
                            35.602881307254144
                        ]
                    ]
                ]
            }
}

现在我想将这个json转换为mapbox Polygon ，我正在使用带有 gson 转换器的改造来接收来自服务器的响应:

@GET("example.com")
    Call<MyResponse> getAll();

import com.mapbox.geojson.Polygon;
public class MyResponse {
    private String status;
    private Polygon location;

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public Polygon getLocation() {
        return location;
    }

    public void setLocation(Polygon location) {
        this.location = location;
    }
}

，但我有这个错误:

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at path $.location.coordinates[0][0]

如何解决这个问题？

Answer 1

您的服务器的 JSON 响应结构与代码预期不符，因此出现上述错误。

根据 POJO 类 Point ( give here )，JSON 响应的结构应如下所示:

{
   "status": "success",
   "location": {
                "type": "Polygon",
                "coordinates": [
                    [
                        { type: "String",
                          coordinates: [50.86541175842285,
                            35.61676761271693]
                        }
                    ]
                ]
            }
}