Fatal Exception : Asynctask #1 Doinbackground

Im new to android programming and i cant pinpoint which triggers the error. i am having this errors: 10-29 02:34:17.989: E/AndroidRuntime(853): FATAL EXCEPTION: AsyncTask #1 10-29

Solution 1:

Do not perform the UI related operation in doInBackgroungd() method. Just return the result in onPostExecute() and then write the code of start activity.

    /**
     * After Completing background task Dismiss the progress Dialog
     */
    protected void onPostExecute(String result) {
        // dismiss the dialog once done
        pDialog.dismiss();
        if(result!=null && result.equals("1")){
            // success to create trip
            Intent i = new Intent(getApplicationContext(), CreateTripActivity.class);
            startActivity(i);
            finish();
        }else{
            // failed to create trip
        }

    }

Solution 2:

// try this way
class CreateTrip extends AsyncTask {
        ProgressDialog pDialog;
        /** * Before Sttarting Background thread Show Progress Dialog */
        @Override protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(CreateTripActivity.this);
            pDialog.setMessage("Creating Trip..."); pDialog.setIndeterminate(false);
            pDialog.setCancelable(true); pDialog.show();
        }
        /**
         * Creating Trip
         */
        protected String doInBackground(String... args) {
            String plate = inputPlate.getText().toString();
            String customer = inputCustomer.getText().toString();
            String area = inputArea.getText().toString();
            String driver = inputDriver.getText().toString();

            //Building parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("plate", plate));
            params.add(new BasicNameValuePair("customer", customer));
            params.add(new BasicNameValuePair("area", area));
            params.add(new BasicNameValuePair("driver", driver));

            //getting JSON Object
            // Note that create trip url accepts post method
            JSONObject json = jsonParser.makeHttpRequest(url_create_trip, "POST", params);

            // check log cat for response
            Log.d("Create Response", json.toString());

            // check for success tag
            try{
                int success = json.getInt(TAG_SUCCESS);

                if (success == 1){
                    // success to create trip
                    return "1";
                }else {
                    return "0";
                    // failed to create trip
                }
            } catch (JSONException e){
                e.printStackTrace();
            }
            return null;
        }
        /**
         * After Completing background task Dismiss the progress Dialog
         */
        protected void onPostExecute(String result) {
            // dismiss the dialog once done
            pDialog.dismiss();
            if(result!=null && result.equals("1")){
                // success to create trip
                Intent i = new Intent(getApplicationContext(), CreateTripActivity.class);
                startActivity(i);
                finish();
            }else{
                // failed to create trip
            }

        }
    }