How do I remove a specific element from a JSONArray?

Question

I am building one app in which I request a PHP file from server. This PHP file returns a JSONArray having JSONObjects as its elements e.g.,

[    {     "uniqid":"h5Wtd",      "name":"Test_1",      "address":"tst",      "email":"[email protected]",      "mobile":"12345",     "city":"ind"   },   {...},   {...},   ... ] 

my code:

/* jArrayFavFans is the JSONArray i build from string i get from response.    its giving me correct JSONArray */ JSONArray jArrayFavFans=new JSONArray(serverRespons); for (int j = 0; j < jArrayFavFans.length(); j++) {   try {     if (jArrayFavFans.getJSONObject(j).getString("uniqid").equals(id_fav_remov)) {       //jArrayFavFans.getJSONObject(j).remove(j); //$ I try this to remove element at the current index... But remove doesn't work here ???? $       //int index=jArrayFavFans.getInt(j);       Toast.makeText(getParent(), "Object to remove...!" + id_fav_remov, Toast.LENGTH_SHORT).show();     }   } catch (JSONException e) {     // TODO Auto-generated catch block     e.printStackTrace();   } } 

How do I remove a specific element from this JSONArray?

Answer 1

Try this code

ArrayList<String> list = new ArrayList<String>();      JSONArray jsonArray = (JSONArray)jsonObject;   if (jsonArray != null) {     int len = jsonArray.length();    for (int i=0;i<len;i++){      list.add(jsonArray.get(i).toString());    }  } //Remove the element from arraylist list.remove(position); //Recreate JSON Array JSONArray jsArray = new JSONArray(list); 

Edit: Using ArrayList will add "\" to the key and values. So, use JSONArray itself

JSONArray list = new JSONArray();      JSONArray jsonArray = new JSONArray(jsonstring);  int len = jsonArray.length(); if (jsonArray != null) {     for (int i=0;i<len;i++)    {         //Excluding the item at position         if (i != position)          {             list.put(jsonArray.get(i));         }    }  } 

Answer 2

In case if someone returns with the same question for Android platform, you cannot use the inbuilt remove() method if you are targeting for Android API-18 or less. The remove() method is added on API level 19. Thus, the best possible thing to do is to extend the JSONArray to create a compatible override for the remove() method.

public class MJSONArray extends JSONArray {      @Override     public Object remove(int index) {          JSONArray output = new JSONArray();              int len = this.length();          for (int i = 0; i < len; i++)   {             if (i != index) {                 try {                     output.put(this.get(i));                 } catch (JSONException e) {                     throw new RuntimeException(e);                 }             }         }          return output;         //return this; If you need the input array in case of a failed attempt to remove an item.      } } 

EDIT As Daniel pointed out, handling an error silently is bad style. Code improved.