Convert Arraylist<Mycustomclass> to JSONarray

convert ArrayList MyCustomClass 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

How to convert ArrayList to JSONArray() in Kotlin

put adds the list as an element to the JSONArray. Thats not what you want. You want your JSONArray to represent the list.

JSONArray offers a constructor for that:

val jsonArray = JSONArray(listOf(1, 2, 3))

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But there is a much easier way. You don't need to worry about single properties. Just pass the whole POJO.

Let's say you have this:

class QuoteData(val id: Int, val quoteId: Int, travellerId: Int?)
class TravelerData(val userQuoteTravellers: List<QuoteData>)

val travelerData = TravelerData(listOf(QuoteData(1354, 546, null)))

You just have to pass travelerData to the JSONArray constructor:

val travelerDataJson = JSONArray(travelerData)

and it will be represented like this:

"userQuoteTravellers": [
{
"id": 1354,
"quoteId": 526,
"travellerId": null
} ]

How to convert arrayList String to json object

Try this

     dataBase = mHelper.getWritableDatabase();
 mCursor = dataBase.rawQuery("SELECT * FROM "
        + DBHelper.TABLE_NAME + " WHERE " + DBHelper.KEY_COUNT
        + " IS NOT NULL AND " + DBHelper.KEY_COUNT + " != '0'", null);
product_price.clear();
productprice = 0;

JSONObject Root = new JSONObject();
JSONArray productArray = new JSONArray();

if (mCursor.moveToFirst()) {
    do {
        JSONObject product = new JSONObject();
        /*
        product_price.add(mCursor.getString(mCursor
                .getColumnIndex(DBHelper.KEY_PRODUCT_TOTAL_PRICE)));
        product_name.add(mCursor.getString(mCursor
                .getColumnIndex(DBHelper.KEY_PNAME)));
        product_quantity.add(mCursor.getString(mCursor
                .getColumnIndex(DBHelper.KEY_COUNT)));*/

        product.put("product_name", mCursor.getString(mCursor
                .getColumnIndex(DBHelper.KEY_PRODUCT_TOTAL_PRICE)));

        product.put("product_total", mCursor.getString(mCursor
                .getColumnIndex(DBHelper.KEY_PNAME)));

        product.put("product_quantity", mCursor.getString(mCursor
                .getColumnIndex(DBHelper.KEY_COUNT)));

        productArray.put(contact);        

    } while (mCursor.moveToNext());

      Root.put( productArray);
}

How to convert List View items to Json Format

// try this code

    JSONObject input      = new JSONObject();
                JSONArray array       = new JSONArray();

                for (int i = 0; i < alSets.size(); i++)
                {
                    JSONObject obj_set1 = new JSONObject();                    
                    String setNo= "Set " + String.valueOf(i+1);
                    obj_set1.put("SetId", i + 1);
                    array.put(obj_set1);
                }
                input("Key", input);

JsonObjectRequest request = new JsonObjectRequest(requestURL,input, stringListener, errorListener);

        request.setRetryPolicy(new DefaultRetryPolicy(
                30000,
                DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
                DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));

        addToRequestQueue(request);

how to convert List object into org.json.JSONArray?

Since arrays are objects in java and being treated as references instead of values so to get the string representation of your array you can use Arrays#toString

obj.put("business_images", Arrays.toString(business_images) );

To get JSONArray use

obj.put("business_images", new JSONArray(Arrays.toString(business_images)));

and since JSONObject support int,long,double,boolean so you don't need to promote primitive to String but if your REST API expecting all as string then use String.valueOf for performance efficiency

obj.put("chat_id", String.valueOf(chat_id));

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