[Solved] Alert dialog with button throws exception

Use it accordingly

  AlertDialog.Builder alertbox = new AlertDialog.Builder(YourActivity.this);

               alertbox.setTitle("Do you want To exit ?");
               alertbox.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface arg0, int arg1) { 
                      // finish used for destroyed activity
                       exit();
                   }
               });

               alertbox.setNegativeButton("No", new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface arg0, int arg1) {
                           // Nothing will be happened when clicked on no button 
                           // of Dialog     
                 }
               });

               alertbox.show();