How to convert a Vector to JSONArray?

问题

I need to convert a Vector<Vector<Float>> to a JSONArray. Apart from iterating through the vector and creating the JSONArray, is there any simpler way to do this?

Someone told me to try gson.

回答1:

SharedPreferences is just a key-value store. What's stopping you from bypassing JSONObject completely, and just using something like this (Gson only)?

private static final Type DATA_TYPE = 
    new TypeToken<Vector<Vector<Float>>>() {}.getType();

Storage:

Vector<Vector<Float>> data = new Vector<Vector<Float>>();
data.add(new Vector<Float>());
data.get(0).add(3.0f);

String dataAsJson = new Gson().toJson(data, DATA_TYPE);
sharedPreferences.edit().putString("data", dataAsJson).commit();

Retrieval:

String dataAsJson = sharedPreferences.getString("data", "[]");
Vector<Vector<Float>> data = new Gson().fromJson(dataAsJson, DATA_TYPE);

Disclaimer: I've never developed for Android.

来源：https://stackoverflow.com/questions/11954578/how-to-convert-a-vector-to-jsonarray