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up vote 36 down vote favorite
10

Is there a way to convert JSON Array to normal Java Array for android ListView data binding?

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4 Answers

up vote 58 down vote accepted 
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());
   } 
}
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3  
for loop is missing the closing parenthesis... tried editing but it's not enough characters to pass approval. oh well! just an FYI. –  Matt K Sep 21 '11 at 17:09
    
itz not missing actually, the answerer just pasted a chunk of code with the function's open and closing braces. –  Sarim Javaid Khan Mar 16 '13 at 22:03
    
What happens if jsonArray.get(i) returns null (as a result of parsing this: [ "String 1", null, "String 2" ])? Wouldn't your for-loop crash then? –  dbm Sep 23 '13 at 12:20
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up vote 36 down vote

If you don't already have a JSONArray object, call

JSONArray jsonArray = new JSONArray(jsonArrayString);

Then simply loop through that, building your own array. This code assumes it's an array of strings, it shouldn't be hard to modify to suit your particular array structure.

List<String> list = new ArrayList<String>();
for (int i=0; i<jsonArray.length(); i++) {
    list.add( jsonArray.getString(i) );
}
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5  
.size() should be .length() –  vaskin Nov 11 '10 at 15:25
2  
Sorry, you're right - I'm confusing Lists with JSONArrays :) It is indeed JSONArray.length(). –  Nick Nov 13 '10 at 15:03
1  
thank you, it's helped.. :D –  andikurnia Apr 8 '13 at 4:02
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up vote 3 down vote

Maybe it's only a workaround (not very efficient) but you could do something like this:

String[] resultingArray = yourJSONarray.join(",").split(",");

Obviously you can change the ',' separator with anything you like (I had a JSONArray of email addresses)

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2  
Note that you must be absolutely sure that the data doesn't contain your separator char, otherwise you'll end up with corrupt data. –  Artemix Nov 22 '12 at 10:03
    
and the result has to be a string. –  Nicolas Tyler Jul 25 '13 at 5:56
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up vote -4 down vote

How about using java.util.Arrays?

List<String> list = Arrays.asList((String[])jsonArray.toArray())
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Brackets don't match and this doesn't work for me. –  yingted Apr 29 '12 at 22:27
11  
I don't see a toArray() method in the JSONArray() docs. json.org/javadoc/org/json/JSONArray.html This question probably wouldn't have been asked if there was a simple toArray(). –  javajavajavajavajava Sep 5 '12 at 19:01
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