Concatenate JSONArrays

Question

I am using JSONArray under the org.json Package.

My first JSONArray is like:

[["249404","VPR249404"],["249403","VPR249403"],["249391","M249391"]]

and Second

[["249386","M249386"],["249385","M249385(I)"],["249384","I249384"]]

So I'd like to append new JSONArray to my first JSONArray.

I am working on Java and Android. I have heard about google-gson library, but I don't know whether it can help me or not but I don't want any other dependency in my Android Application.

Answer 1

I would try something like this:

private JSONArray concatArray(JSONArray arr1, JSONArray arr2)         throws JSONException {     JSONArray result = new JSONArray();     for (int i = 0; i < arr1.length(); i++) {         result.put(arr1.get(i));     }     for (int i = 0; i < arr2.length(); i++) {         result.put(arr2.get(i));     }     return result; } 

I don't have a compiler right now to test, but you can give it a try and see if it works (or, at least, it gives you an idea of how to do it).

EDIT

This version could concat multiple arrays (concatArray(arr1, arr2, arr3)):

private JSONArray concatArray(JSONArray... arrs)         throws JSONException {     JSONArray result = new JSONArray();     for (JSONArray arr : arrs) {         for (int i = 0; i < arr.length(); i++) {             result.put(arr.get(i));         }     }     return result; }