How do i get the response in onPostExecute() AsyncTask android

Question

I recently started working on android, now i am working with AsyncTask how can i get response which is returned from the API below is the code.Every suggestion is appreciable.

 class signmeup extends AsyncTask<String, String, String> { private ProgressDialog pDialog; JSONParser jsonParser = new JSONParser(); @Override protected void onPreExecute() { super.onPreExecute(); pDialog = new ProgressDialog(WolfActivity.this); pDialog.setMessage("Loading"); pDialog.setIndeterminate(false); pDialog.setCancelable(false); pDialog.show(); } @Override protected String doInBackground(String... arg0) { // TODO Auto-generated method stub // Building Parameters List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("section","user")); params.add(new BasicNameValuePair("action","new")); params.add(new BasicNameValuePair("device_type","2")); params.add(new BasicNameValuePair("device_token","dhdkhgkdfhgkhfdghkdfjhgkjdfhgkdfhkhkHKhdkhsdkhKJHKWJHDSKAHDKJSAHJKDfhkashfkdjhfkjhskjhKJHJk")); params.add(new BasicNameValuePair("first_name",fname)); params.add(new BasicNameValuePair("last_name",lname)); params.add(new BasicNameValuePair("email",email)); params.add(new BasicNameValuePair("phone",phone)); params.add(new BasicNameValuePair("fax",fax)); params.add(new BasicNameValuePair("address",addr)); params.add(new BasicNameValuePair("address1",addr1)); params.add(new BasicNameValuePair("facility",facility)); params.add(new BasicNameValuePair("password",pwd)); params.add(new BasicNameValuePair("zip",zipcode)); params.add(new BasicNameValuePair("city",city)); params.add(new BasicNameValuePair("state",state)); params.add(new BasicNameValuePair("how_you_found",huf)); params.add(new BasicNameValuePair("how_you_found_value",hufv)); // getting JSON Object // Note that create product url accepts POST method JSONObject json = jsonParser.makeHttpRequest("http://eastendwebsolutions.com/wf/ws/", "GET", params); Log.d("First Name",fname); Log.d("Last Name",lname); Log.d("Email",email); // check log cat for response Log.d("Create Response", json.toString()); // check for success tag try { String success = json.getString("status"); String message = json.getString("message"); if(success == "0") { Toast.makeText(WolfActivity.this,message ,Toast.LENGTH_LONG).show(); } else { Toast.makeText(WolfActivity.this,"Error "+message ,Toast.LENGTH_LONG).show(); } } catch (JSONException e) { e.printStackTrace(); } return null; } @SuppressWarnings("deprecation") //@Override protected void onPostExecute(String Result) { if(pDialog.isShowing()){ pDialog.dismiss(); } Log.d("Result",Result); AlertDialog.Builder builder=new AlertDialog.Builder(WolfActivity.this); builder.setTitle("Info"); builder.setMessage("Successfully registered"); builder.setIcon(R.drawable.app_icon); builder.create().show(); } }

Above code is terminates with error

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toString()' on a null object reference at zonup.wolf.WolfActivity$signmeup.onPostExecute(WolfActivity.java:222) at zonup.wolf.WolfActivity$signmeup.onPostExecute(WolfActivity.java:135)

Error because this statement Log.d("Result",Result); in function onPostExecute(String Result)

I tried to alert the user with status in doInBackground() method but no toasts are coming:( is it correct??

returning null from doInBackground. means Result is null — ρяσѕρєя K
– ρяσѕρєя K, Commented Apr 2, 2015 at 11:06
so i have to return string which is converted/type casted from json response right ? @ρяσѕρєяK — manikanta g
– manikanta g, Commented Apr 2, 2015 at 11:09
@ manikanta g : yes return json and show Toast and notification from ` onPostExecute` method — ρяσѕρєя K
– ρяσѕρєя K, Commented Apr 2, 2015 at 11:11

Karthika PB · Accepted Answer · 2015-04-02 11:14:41Z

Just try this way you can see the message you get in the json response.

 class signmeup extends AsyncTask<String, String, String> { String message=""; private ProgressDialog pDialog; JSONParser jsonParser = new JSONParser(); @Override protected void onPreExecute() { super.onPreExecute(); pDialog = new ProgressDialog(WolfActivity.this); pDialog.setMessage("Loading"); pDialog.setIndeterminate(false); pDialog.setCancelable(false); pDialog.show(); } @Override protected String doInBackground(String... arg0) { // TODO Auto-generated method stub // Building Parameters List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("section","user")); params.add(new BasicNameValuePair("action","new")); params.add(new BasicNameValuePair("device_type","2")); params.add(new BasicNameValuePair("device_token","dhdkhgkdfhgkhfdghkdfjhgkjdfhgkdfhkhkHKhdkhsdkhKJHKWJHDSKAHDKJSAHJKDfhkashfkdjhfkjhskjhKJHJk")); params.add(new BasicNameValuePair("first_name",fname)); params.add(new BasicNameValuePair("last_name",lname)); params.add(new BasicNameValuePair("email",email)); params.add(new BasicNameValuePair("phone",phone)); params.add(new BasicNameValuePair("fax",fax)); params.add(new BasicNameValuePair("address",addr)); params.add(new BasicNameValuePair("address1",addr1)); params.add(new BasicNameValuePair("facility",facility)); params.add(new BasicNameValuePair("password",pwd)); params.add(new BasicNameValuePair("zip",zipcode)); params.add(new BasicNameValuePair("city",city)); params.add(new BasicNameValuePair("state",state)); params.add(new BasicNameValuePair("how_you_found",huf)); params.add(new BasicNameValuePair("how_you_found_value",hufv)); // getting JSON Object // Note that create product url accepts POST method JSONObject json = jsonParser.makeHttpRequest("http://eastendwebsolutions.com/wf/ws/", "GET", params); Log.d("First Name",fname); Log.d("Last Name",lname); Log.d("Email",email); // check log cat for response Log.d("Create Response", json.toString()); // check for success tag try { String success = json.getString("status"); message = json.getString("message"); if(success == "0") { Toast.makeText(WolfActivity.this,message ,Toast.LENGTH_LONG).show(); } else { Toast.makeText(WolfActivity.this,"Error "+message ,Toast.LENGTH_LONG).show(); } } catch (JSONException e) { message=e.toString(); e.printStackTrace(); } return message; } @SuppressWarnings("deprecation") //@Override protected void onPostExecute(String Result) { if(pDialog.isShowing()){ pDialog.dismiss(); } Log.d("Result",Result); AlertDialog.Builder builder=new AlertDialog.Builder(WolfActivity.this); builder.setTitle("Info"); builder.setMessage(Result); builder.setIcon(R.drawable.app_icon); builder.create().show(); } }

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