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PODefaultHttpClient's "connManager" is always null,cant execute http requests
 

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    <p>i am building an application in which i prompt users to register. I have a <em>django-restful</em> server running at back end , and i m trying to make HTTP post requests to my server on android client with <em>DefaultHttpClient</em> class. I get email, username etc from user and at the button's onClick event, i create an <em>AsnycTask</em> to execute the request. Here is the code for the activity:</p> <pre><code>registerButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { String userName = usernameEditText.getText().toString(); String email = emailEditText.getText().toString(); String password = passwordEditText.getText().toString(); if( userName != null &amp;&amp; email != null &amp;&amp; password != null) { new RegisterEventHandler().execute(userName , email , password); } } }); .... class RegisterEventHandler extends AsyncTask&lt;String, Integer, Boolean&gt; { @Override protected Boolean doInBackground(String... params) { RequestHandler handler = new RequestHandler(); return handler.register(params[0], params[1], params[2]); } @Override protected void onPostExecute(Boolean result) { super.onPostExecute(result); if( result ) { AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext()); builder.setTitle(R.string.RegisterSuccessfullTitle); builder.setMessage(R.string.RegisterSuccessfullMessage); builder.setPositiveButton(R.string.OK, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Intent redirect = new Intent(getApplicationContext() , SmartMapMainActivity.class); startActivity(redirect); } }); builder.create().show(); } else { AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext()); builder.setTitle(R.string.RegisterFailedTitle); builder.setMessage(R.string.RegisterFailedMessage); builder.create().show(); } } } </code></pre> <p>The RequestHandler class :</p> <pre><code>public class RequestHandler { public boolean register(String userName , String email , String password) { HttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost("http://127.0.0.1/users/"); try { JSONObject jsonObj = new JSONObject(); jsonObj.put("username", userName); jsonObj.put("email", email); jsonObj.put("password", password); StringEntity entity = new StringEntity(jsonObj.toString()); entity.setContentType("application/json"); httpPost.setEntity(entity); HttpResponse response = httpClient.execute(httpPost); if(response.getStatusLine().getStatusCode() == 200) return true; else return false; } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (JSONException e) { e.printStackTrace(); } return false; } } </code></pre> <p>The problem is, <em>DefaultHttpClient</em>'s connManager(ClientConnectionManager) is always <strong>null</strong> and on the <em>execute()</em> method of the <em>HttpClient</em>, it always throws an <strong>IOException</strong>. I tried initializing the <em>DefaultHttpClient</em> in my activity , rather than in the AsyncTask's <em>doInBackground</em> method , but the result was the same. </p>
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    1. COCan we see the stack trace?
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    2. COHttpHostConnectException(Throwable).toString() line: 360 HttpHostConnectException(Throwable).printStackTrace(Appendable, String, StackTraceElement[]) line: 320 HttpHostConnectException(Throwable).printStackTrace(PrintStream) line: 287 HttpHostConnectException(Throwable).printStackTrace() line: 235 RequestHandler.register(String, String, String) line: 44 RegisterActivity$RegisterEventHandler.doInBackground(String...) line: 59 RegisterActivity$RegisterEventHandler.doInBackground(Object...) line: 1 AsyncTask$2.call() line: 287 FutureTask$Sync.innerRun() line: 305
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    3. COIt jumps to the RequestHandler's catch(IOException e) on debug mode. And trace is this.
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