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copied!<p>Find the below working code</p> <pre><code>public class LoginTask extends AsyncTask<Void, Void, RequestToken> { private ProgressDialog progressDialog; public LoginTask() { progressDialog = ProgressDialog.show(MainActivity.this, "", "Loading. Please wait...", false); } @Override protected RequestToken doInBackground(Void... params) { // TODO Auto-generated method stub ConfigurationBuilder builder = new ConfigurationBuilder(); builder.setOAuthConsumerKey(TWITTER_CONSUMER_KEY); builder.setOAuthConsumerSecret(TWITTER_CONSUMER_SECRET); Configuration configuration = builder.build(); TwitterFactory factory = new TwitterFactory(configuration); twitter = factory.getInstance(); try { return requestToken = twitter .getOAuthRequestToken(TWITTER_CALLBACK_URL); } catch (TwitterException e) { e.printStackTrace(); return null; } } @Override protected void onPreExecute() { // TODO Auto-generated method stub MainActivity.this.setProgressBarIndeterminateVisibility(true); } @Override protected void onPostExecute(RequestToken result) { // TODO Auto-generated method stub MainActivity.this.setProgressBarIndeterminateVisibility(false); progressDialog.dismiss(); try { requestToken = result; MainActivity.this.startActivity(new Intent(Intent.ACTION_VIEW, Uri .parse(requestToken.getAuthenticationURL()))); } catch(Exception e) { e.printStackTrace(); alert.showAlertDialog(MainActivity.this, "Internet Connection Timeout Error", "Please try later.", false); } } } </code></pre> <p>Can you put your logcat error. So that it will easy to find why you are getting null pointer exception.</p>

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