如何用retrofit2解析JSON数组？

Question

这是我的 JSON 响应：

{
"features":[
{
"id":1,
"points":[
{
"accuracy":2.40000009537,
"latitude":5.163021,
"longitude":-1.601401
},
{
"accuracy":2.22000002861,
"latitude":5.163061,
"longitude":-1.600696
},
{
"accuracy":2.4300000667572,
"latitude":5.162021,
"longitude":-1.599648
}
]
},
{
"id":2,
"points":[
{
"accuracy":2.09999990463257,
"latitude":5.191406,
"longitude":-1.56806
},
{
"accuracy":2.09999990463257,
"latitude":5.191236,
"longitude":-1.567971
}
]
},

如何区分“id”:1 或“id”:2 的坐标，例如“get features.id:1, then features.id:2?”我在任何地方都没有找到答案。

我的数据类：

data class Location(
    val accuracy: String,
    val latitude: String,
    val longitude: String
) 

API：

interface ApiService {

    @GET("/.json")
    suspend fun getLocations(): List<Location>

}

链接：https://releases-f89f5.firebaseio.com/.json

Answer 1

我了解到，当您在 JSON 中遇到列表对象和列表数组时，您想解析 JSON。

类点：

data class Point(
    val accuracy: Double,
    val latitude: Double,
    val longitude: Double
)

类特征：

data class Feature(
    val id: Int,
    val points: List<Point>
)

类 StackOverflow：

data class StackOverflow(
    val features: List<Feature>
)

解析 JSON：

//parse JSON
val demo = Gson().fromJson("{\"features\":[{\"id\":1,\"points\":[{\"accuracy\":2.40000009537,\"latitude\":5.163021,\"longitude\":-1.601401}]},{\"id\":2,\"points\":[{\"accuracy\":3.69000005722046,\"latitude\":5.190501,\"longitude\":-1.567918}]}]}", StackOverflow::class.java)

// Check 
demo.features[0].id      // = 1
demo.features[0].points[0].accuracy // = 2.40000009537
demo.features.forEach { feature ->
     Log.d("LogDebug", "data feature ${Gson().toJson(feature)}")
     if (feature.id == 2) {
         feature.points.forEach { point ->
         Log.d("LogDebug", "data point ${Gson().toJson(point)}")
         }
     }
}