How to use Gson to parse JSON file that contains arrays

Question

I am trying to read a JSON file from this URL using ion, a library for Android, and Gson.

The JSON file in its current state:

{
    "Excited":["https://github.com/vedantroy/image-test/raw/master/Happy/excited1.gif",
                "https://github.com/vedantroy/image-test/raw/master/Happy/excited2.gif",
                "https://github.com/vedantroy/image-test/raw/master/Happy/excited3.gif"],

    "Sad":["https://github.com/vedantroy/image-test/raw/master/Sad/sad1.gif",
            "https://github.com/vedantroy/image-test/raw/master/Sad/sad2.gif",
            "https://github.com/vedantroy/image-test/raw/master/Sad/sad3.gif",
            "https://github.com/vedantroy/image-test/raw/master/Sad/sad4.gif"]

}

Important note: While right now the JSON file has two arrays, "Excited" and "Sad", it may have more arrays in the future. However, the base structure of the file will always be a series of JSON arrays.

My objective is to convert this JSON object containing two (but could be more) arrays into a list of lists.

Here is my code so far, it parses the URL and returns a Gson JsonObject called "result":

Ion.with(applicationContext)
                .load("https://raw.githubusercontent.com/vedantroy/image-test/master/index.json")
                .asJsonObject()
                .setCallback { e, result ->
                    //Do something...
                }

This code can also be written as:

Ion.with(applicationContext)
                .load("https://raw.githubusercontent.com/vedantroy/image-test/master/index.json")
                .asJsonObject()
                .setCallback(object : FutureCallback<JsonObject> {
                    override fun onCompleted(e: Exception?, result: JsonObject?) {
                        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
                    }

                })

Answer 1

Loop through the JsonObject entrySet and add each JsonArray into the list, I use my Java code, you can convert it to Kotlin if need:

ArrayList<JsonArray> result = new ArrayList<>();
for (Map.Entry<String, JsonElement> entry : resultJson.entrySet()) {
    if (entry.getValue().isJsonArray()) {
        result.add(entry.getValue().getAsJsonArray());
    }
}