send arraylist as parameter in volley request

Question

I'm trying to send arraylist containing numbers as parameter in volley request and then parse it and display the values (in string) in toast. But I'm getting null in response. I would like to know where is the problem.

json response:

{
  "got_members": [
    "1",
    "2"
  ]
}

public class SearchFragment extends Fragment{

    Button checkme;
    private static final String ADDMEM = "http://www.example.com/api/event/addmembers/", KEY_ADDMEM = "adding_members";

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.searchfragment, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);


        checkme = (Button)view.findViewById(R.id.checkme);
        checkme.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                checkarraylist();

            }
        });
    }

    private void checkarraylist(){
        StringRequest stringRequest = new StringRequest(Request.Method.POST, ADDMEM,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {

                        if(response != null){
                            try {
                                JSONObject object = new JSONObject(response);
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }


                        }else {

                            Toast.makeText(getActivity(), response, Toast.LENGTH_SHORT).show();
                            try {

                                JSONArray itemArray = new JSONObject(response).getJSONArray("got_members");
                                for (int i = 0; i < itemArray.length(); i++) {
                                    String value = itemArray.getString(i);
                                    Toast.makeText(getActivity(), "Result:" + value + "\n", Toast.LENGTH_SHORT).show();
                                }


                            } catch (JSONException e) {
                                // JSON error
                                e.printStackTrace();
                                Toast.makeText(getActivity(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
                            }

                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(getActivity(), error.toString(), Toast.LENGTH_LONG).show();
            }
        }) {
            @Override
            protected Map<String, String> getParams() {
                ArrayList<String> strings = new ArrayList<String>();
                strings.add("10");
                strings.add("20");
                strings.add("30");
                Map<String, String> params = new HashMap<String, String>();
                int i=0;
                for(String object: strings){
                    params.put("adding_members["+(i++)+"]", object);
                    System.out.println(object);
                }

           /*    String array[]=strings.toArray(new String[strings.size()]);

                for(String k: array)
                {

                    params.put("adding_members", k);
                    System.out.println(k);
                } */



                return params;
            }

            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                Map<String, String> params = new HashMap<String, String>();
                params.put("Content-Type", "application/x-www-form-urlencoded;  charset=utf-8");
                return params;
            }

        };

        RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
        requestQueue.add(stringRequest);
    }




}

Answer 1

First in your Object in ArrayList: create JSONObjectmethod name as getJSONObject, like this

public class EstimateObject {
String id, name, qty, price, total;
public EstimateObject(String id, String name, String qty, String price, String total, int position)
{
    this.id = id;
    this.name = name;
    this.qty = qty;
    this.price = price;
    this.total =total;
    this.position = position;
}
 public JSONObject getJSONObject() {
    JSONObject obj = new JSONObject();
    try {
        obj.put("Id", id);
        obj.put("Name", name);
        obj.put("Qty",qty);
        obj.put("Price", price);
        obj.put("Total", total);
    }
    catch (JSONException e) {
        e.printStackTrace();
    }
    return obj;
}

Aftrer Here is how I converted it,in my activity

    JSONObject JSONestimate = new JSONObject();
    JSONArray myarray = new JSONArray();

    for (int i = 0; i < items.size(); i++) {

        try {
            JSONestimate.put("data:" + String.valueOf(i + 1), items.get(i).getJSONObject());
            myarray.put(items.get(i).getJSONObject());

        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
    Log.d("JSONobject: ", JSONestimate.toString());
    Log.d("JSONArray : ", myarray.toString());

Here i converted both type JSONObject and JSONArray.

After in

map.put("jsonarray",myarray.toString());

Answer 2

First get the response in JsonObject and then retreive the JsonArray or change the string request to JsonArray request

 try {
      JsonObject object=new JsonObject(response)

                            JSONArray itemArray = new JSONArray("got_members");
                            for (int i = 0; i < itemArray.length(); i++) {
                                String value=itemArray.getString(i);
                                //Log.e("json", i+"="+value);
                                Toast.makeText(getActivity(), "Result:" + value+"\n", Toast.LENGTH_SHORT).show();
                            }



                    } catch (JSONException e) {
                        // JSON error
                        e.printStackTrace();
                        Toast.makeText(getActivity(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
                    }
                }

or simply use JSONArray array = new JSONObject (response).getJSONArray("got_members");

Answer 3

try this instead of sending whole arraylist,if you are sending contact

@Override
        protected Map<String, String> getParams() throws AuthFailureError {

            ArrayList<String> numbers = new ArrayList<String>();
            Cursor phones = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, null);

            while (phones.moveToNext())
            {
                String name=phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                String phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
               numbers.add("\n"+name+"\n"+phoneNumber+"\n");

            }
            phones.close();

            Map<String, String> params = new HashMap<String, String>();

            int i=0;
            for(String object: numbers){
                params.put("a"+(i++), object);
             if(i==10)
               break;
            }
            return params;

now handle this on server side

$response=array();$response["res"]=array(); foreach($_POST as $k => $v) {
if(strpos($k, 'a') === 0) {
    $res=array();
    $ab=$k = $v;
    $res["name"]=$ab;array_push($response["res"],$res);}}echo json_encode($response);

now after response

@Override
        public void onResponse(String response) {

            try {

                JSONObject stdent = new JSONObject(response);
                JSONArray students = stdent.getJSONArray("res");
                for (int i = 0; i < students.length(); i++) {
                    String ab=students.getString(i);
                    Toast.makeText(getApplicationContext(),  ab, Toast.LENGTH_LONG).show();

                }

Answer 4

You have to parse the JSONObject first . Then get the JSONArray . like this way ->

try {
    JSONArray array = new JSONObject(response).getJSONArray("got_members");
    for (int i = 0; i < itemArray.length(); i++) {
        String value=itemArray.getString(i);
        //Log.e("json", i+"="+value);
        Toast.makeText(getActivity(), "Result:" + value+"\n", Toast.LENGTH_SHORT).show();
    }
} catch (JSONException e) {
    e.printStackTrace();
}

Answer 5

You need to add the following code alongwith your overriding getParams() function

@Override
        protected Map<String, String> getParams() {
//Parameters added here
}

@Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            Map<String, String> params = new HashMap<String, String>();
            params.put("Content-Type", "application/x-www-form-urlencoded;  charset=utf-8");
            return params;
        }

Also you need to change this line

JSONArray itemArray = new JSONArray("got_members");

to

JSONArray itemArray = new JSONObject(response).getJSONArray("got_members");

Answer 6

This may be the late response but as per response example this could help a bit

try {
        JSONObject object = new JSONObject();
        JSONArray jsonArray = new JSONArray();
        for (int i = 0; i < 2; i++) {
            String someString = String.valueOf(i);
            jsonArray.put(someString);
        }
        object.put("got_members", jsonArray);
    } catch (JSONException e) {
        e.printStackTrace();
    }