Creating array lists using Json object file in android

Question

Please check out my following code

String jsonString = writer.toString();
 JSONObject jsonObj = new JSONObject(jsonString); 
 defaultCurrencyValue = jsonObj.getString(DefaultCurrencyKey);
 currenciesTypes = jsonObj.get(CurrenciesKey);

This is what i get the values of curenciesType object class variable when i used Debugger

currenciesTypes JSONObject (id=830084916104) 
 myHashMap HashMap (id=830084916120) 
 [0] HashMap$HashMapEntry (id=830084916440) 
 key "PKR" (id=830084916256) 
 value "Rs" (id=830084916368) 
 [1] HashMap$HashMapEntry (id=830084917208) 
 key "EUR" (id=830084917064) 
 value "€" (id=830084917176) 
 [2] HashMap$HashMapEntry (id=830084916696) 
 [3] HashMap$HashMapEntry (id=830084916952) 

Please anyone can tell me how can i save key and its values in two array lists?

Best Regards

• user1237385: why you need two different array lists..you can store it within one array list..

Answer 1

Have two arraylists say keys, and values:

String jsonString = writer.toString();
 JSONObject jsonObj = new JSONObject(jsonString); 
 currenciesTypes = jsonObj.get(CurrenciesKey);
 ArrayList<String> keys=new ArrayList<String>();
 ArrayList<String> values=new ArrayList<String>();
 Iterator<String> iterator=currencyType.keys();
 while(iterator.hasNext())
 {
 String key=iterator.next();
 keys.add(key);
 values.add(currencyType.get(key));
 }

• Adrian: Awesome solution. Just used it in combination with a HashMap. Thank you

Answer 2

@user966227 :

Hey, refer this link it will definitely help you out....

http://www.vogella.de/articles/AndroidJSON/article.html

In this page tutorial of getting data from JSON file into array is shown. But i think you can use that for converting into array list also...

• Muhammad Umar: look i have a JSONOBJECT Class variable currenciesTypes , from it, i want to retrieve both key and value. I can get value if i use variable.get(Key). But here in this case, i want to store key too in an array

Answer 3

 String jsonString = writer.toString();
 JSONObject jsonObj = new JSONObject(jsonString); 
 JSONObject currenciesTypes = jsonObj.get(CurrenciesKey);
 List<Pair<String,String>> keyValuePairList=new ArrayList<Pair<String,String>>();
 Iterator<String> iterator=currenciesTypes.keys();
 while(iterator.hasNext())
 {
 String key=iterator.next();
 Pair<String,String> keyValue=new Pair<String,String>(key, (String) currenciesTypes.get(key));
 keyValuePairList.add(keyValue);
 }