title: Null pointer access: The variable context can only be null at this location
body: <p>i keep getting this error on line but if i remove the null i get errors on context telling me to initialize variable..</p>
  
  <pre><code>nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
  </code></pre>
  
  <p><strong>this is my code</strong></p>
  
  <pre><code>            public void createDialog(Enter_med enter_med) {
          // TODO Auto-generated method stub
  
          Context context = null;
  
          NotificationManager nm;
            nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);        
            CharSequence from = "VIPUL";
            CharSequence message = "Crazy About Android...";
            PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
              new Intent(), 0);
            Notification notif = new Notification(R.drawable.ic_launcher,
              "Crazy About Android...", System.currentTimeMillis());
            notif.setLatestEventInfo(context, from, message, contentIntent);
            nm.notify(1, notif);
      }
  </code></pre>