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Is there any way to convert a normal Java array or ArrayList to a Json Array in Android to pass the JSON object to a webservice?

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4 Answers 4

up vote 30 down vote accepted

If you want or need to work with a Java array then you can always use the java.util.Arrays utility classes' static asList() method to convert your array to a List.

Something along those lines should work.

String mStringArray[] = { "String1", "String2" };

JSONArray mJSONArray = new JSONArray(Arrays.asList(mStringArray));

Beware that code is written offhand so consider it pseudo-code.

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Is arrays.asList necessary? Even tough JSONArray has no constructor with String[] as parameter the following code works fine for me: String[] strings = {"a", "b"}; JSONArray json = new JSONArray(strings); System.out.println(json.toString()); –  M-- Aug 24 '13 at 11:04
up vote 15 down vote 
ArrayList<String> list = new ArrayList<String>();
list.add("blah");
list.add("bleh");
JSONArray jsArray = new JSONArray(list);

This is only an example using a string arraylist

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4  
Yep! Doesn't seem to work on normal String arrays though as they are not part of the Collection ( developer.android.com/reference/java/util/Collection.html )? But if all else fails you can just run a for loop for that. –  Klaus Mar 2 '11 at 11:26
    
Try passing Arrays.asList(stringArray) –  pasta12 Oct 14 '13 at 14:59
    
asList() does not seem to work as I am having this problem right now –  BrassApparatus May 13 '14 at 15:34
up vote 4 down vote

you need external library 

 json-lib-2.2.2-jdk15.jar

List mybeanList = new ArrayList();
mybeanList.add("S");
mybeanList.add("b");

JSONArray jsonA = JSONArray.fromObject(mybeanList);
System.out.println(jsonA);

Google Gson is the best library http://code.google.com/p/google-gson/

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up vote 3 down vote

I don't think that there is a direct way. Here I am sharing some links. I hope they help you

http://localtone.blogspot.com/2009/07/post-json-using-android-and-httpclient.html

Sending and Parsing JSON in Android

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