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POHow can i to get the result of OnPostExecute() to main activity because AsyncTask is a separate class?
 

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  1. POHow can i to get the result of OnPostExecute() to main activity because AsyncTask is a separate class?
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    <p>I read and apply something from this link:<a href="https://stackoverflow.com/questions/12575068/how-to-get-the-result-of-onpostexecute-to-main-activity-because-asynctask-is-a">How to get the result of OnPostExecute() to main activity because AsyncTask is a separate class?</a> but I get an error NullPointerException onPostExecute on the line delegate.processFinish(result); What is the problem in my code? Here is the code:</p> <pre><code>public class MainActivity extends Activity implements AsyncResponse{ ProductConnect asyncTask =new ProductConnect(); public void processFinish(String output){ //this you will received result fired from async class of onPostExecute(result) method. Log.v(TAG, output); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); asyncTask.delegate = this; setContentView(R.layout.activity_main); Button b = (Button) findViewById(R.id.button1); final Intent i=new Intent(MainActivity.this, second.class); b.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub new ProductConnect().execute(true); startActivity(i); //startActivity(new Intent(MainActivity.this, second.class)); } }); } // START DATABASE CONNECTION class ProductConnect extends AsyncTask&lt;Boolean, String, String&gt; { public AsyncResponse delegate=null; private Activity activity; public void MyAsyncTask(Activity activity) { this.activity = activity; } @Override protected String doInBackground(Boolean... params) { String result = null; StringBuilder sb = new StringBuilder(); try { // http post HttpClient httpclient = new DefaultHttpClient(); HttpGet httppost = new HttpGet("http://192.168.2.245/getProducts.php"); HttpResponse response = httpclient.execute(httppost); if (response.getStatusLine().getStatusCode() != 200) { Log.d("MyApp", "Server encountered an error"); } BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF8")); sb = new StringBuilder(); sb.append(reader.readLine() + "\n"); String line = null; while ((line = reader.readLine()) != null) { sb.append(line + "\n"); } result = sb.toString(); Log.d("test", result); } catch (Exception e) { Log.e("log_tag", "Error converting result " + e.toString()); } return result; } @Override protected void onPostExecute(String result) { try { JSONArray jArray = new JSONArray(result); JSONObject json_data; for (int i = 0; i &lt; jArray.length(); i++) { json_data = jArray.getJSONObject(i); t = json_data.getString("name"); delegate.processFinish(result); } } catch (JSONException e1) { e1.printStackTrace(); } catch (ParseException e1) { e1.printStackTrace(); } super.onPostExecute(result); } protected void onPreExecute() { super.onPreExecute(); ProgressDialog pd = new ProgressDialog(MainActivity.this); pd.setTitle("Lütfen Bekleyiniz"); pd.setMessage("Authenticating.."); pd.show(); } } </code></pre>
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