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首页 > 解决方案 > java.lang.NumberFormatException：无效的双精度：android中的“5b80393f7fca491488980fe1”

android - java.lang.NumberFormatException：无效的双精度：android中的“5b80393f7fca491488980fe1”

问题描述

我有这个 Kotlin 课程

class CategoryJsonData(val category: List<Category>) 
data class Category(val _id:Double, val category_name:String, val sub_category_name:String, val price:Int)

在这一行，我得到一个错误

val jsonData = gson.fromJson(body, CategoryJsonData::class.java)

当我解析这个 JSON

{ "_id": "5b80393f7fca491488980fe1", "category_name": "electrical", "sub_category_name": "switches meters and fuses", "price": 300 }

java.lang.NumberFormatException：无效的双精度：“5b80393f7fca491488980fe1”

5b80393f7fca491488980fe1(_id)由 mongoose 使用 nodejs 生成。在尝试访问 API 时显示此错误。

09-18 23:26:47.026 18264-18542/com.hiretheskill.skill E/AndroidRuntime: FATAL EXCEPTION: OkHttp Dispatcher
    Process: com.hiretheskill.skill, PID: 18264
    java.lang.NumberFormatException: Invalid double: "5b80393f7fca491488980fe1"
        at java.lang.StringToReal.invalidReal(StringToReal.java:63)
        at java.lang.StringToReal.initialParse(StringToReal.java:164)
        at java.lang.StringToReal.parseDouble(StringToReal.java:282)
        at java.lang.Double.parseDouble(Double.java:301)
        at com.google.gson.stream.JsonReader.nextDouble(JsonReader.java:909)
        at com.google.gson.Gson$2.read(Gson.java:284)
        at com.google.gson.Gson$2.read(Gson.java:278)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:129)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:220)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:41)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:82)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:61)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:129)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:220)
        at com.google.gson.Gson.fromJson(Gson.java:887)
        at com.google.gson.Gson.fromJson(Gson.java:852)
        at com.google.gson.Gson.fromJson(Gson.java:801)
        at com.google.gson.Gson.fromJson(Gson.java:773)
        at com.hiretheskill.skill.SubCategories$fetchJsonData$client$1.onResponse(SubCategories.kt:45)
        at okhttp3.RealCall$AsyncCall.execute(RealCall.java:153)
        at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
        at java.lang.Thread.run(Thread.java:818)

标签： androidkotlingson

解决方案

In your JSON, this is a String "_id": "5b80393f7fca491488980fe1"

In your class, you defined it as a Double val _id:Double

You need to change that to be a String since you have non-numerical characters in the JSON value

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