Problems in calling facebook login dialogue in android using facebook android sdk

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Mobile

Android

Facebook-API

SDK

i have following code to call facebook login dialogue in my android application,

public void loginToFacebook() {
   if (access_token != null) {
      facebook.setAccessToken(access_token);
   }

   if (expires != 0) {
      facebook.setAccessExpires(expires);
   }

   if (!facebook.isSessionValid()) {
      facebook.authorize(this,
         new String[] { "email", "publish_stream" },
         new DialogListener() {
            @Override
            public void onCancel() {
               // Function to handle cancel event
            }

            @Override
            public void onComplete(Bundle values) {
               // Function to handle complete event
               // Edit Preferences and update facebook acess_token
               AsyncCallFacebookCredentials task1 = new AsyncCallFacebookCredentials();
               task1.execute();
               SharedPreferences.Editor editor = mPrefs.edit();
               editor.putString("LoginStatus", "on");
               editor.putString("access_token", facebook.getAccessToken());
               Log.e("AccessToken",facebook.getAccessToken());
               fbAccessToken_edit.putString("fbAccessToken", facebook.getAccessToken());
               fbAccessToken_edit.commit();
               editor.putLong("access_expires", facebook.getAccessExpires());
               editor.commit();
               Intent intent = new Intent(Register.this, MainActivity.class);
               startActivity(intent);
               finish();
            }

            @Override
            public void onError(DialogError error) {
               // Function to handle error
            }

            @Override
            public void onFacebookError(FacebookError fberror) {
               // Function to handle Facebook errors
            }

         });
   }
}

i am using above function in two activities, two activities have exactly same code as above, but in one activity it works perfectly but in other activity the login dialogue takes too much time to appear and after appearing if i enter credentials and press login button nothing happens.

Please help
Thanks


[edit]Code block added and indexation optimized[/edit]