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androidarraysjsonkotlinklaxon

Android Kotlin + Klaxon - Parsing a JSON root array

I have a JSON asset with a root array:

[
  {
    "word": "word",
    "label": "label"
  },
  {
    "word": "word2",
    "label": "label2"
  }
]

I'm trying to parse it using Klaxon.

So far I have tried several methods:

val wordDict = Klaxon().parse<List<DictWord>>( activity.assets.open("dict.json") )

val wordDict = Klaxon().parse<Array<DictWord>>( activity.assets.open("dict.json") )

val wordDict = Klaxon().parse<JsonArray<DictWord>>( activity.assets.open("dict.json") )

Which either results in an empty list or an exception:

java.lang.ClassCastException: com.beust.klaxon.JsonArray cannot be cast to com.beust.klaxon.JsonObject

What am I doing wrong?

Solution

  • Found the answer in Klaxon's GitHub issue board: https://github.com/cbeust/klaxon/issues/87

    Array parsing is done via parseArray(), so the fix was:

    val wordDict = Klaxon().parseArray<DictWord>( activity.assets.open("dict.json") )

    It is worth mentioning that array parsing is only supported via the streaming API, not the object mapping API. So we are limited to either supplying an InputStream or a String as an argument.