convert ArrayList to JSONArray

If I read the JSONArray constructors correctly, you can build them from any Collection (arrayList is a subclass of Collection) like so:

ArrayList<String> list = new ArrayList<String>();
list.add("foo");
list.add("baar");
JSONArray jsArray = new JSONArray(list);

References:

• jsonarray constructor:
  http://developer.android.com/reference/org/json/JSONArray.html#JSONArray%28java.util.Collection%29
• collection:
  http://developer.android.com/reference/java/util/Collection.html