int icono = R.mipmap.ic_launcher;
            Intent i=new Intent(MainActivity.this, MensajeActivity.class);
            PendingIntent pendingIntent = PendingIntent.getActivity(MainActivity.this, 0, i, 0);

            mBuilder =new NotificationCompat.Builder(getApplicationContext())
                    .setContentIntent(pendingIntent)
                    .setSmallIcon(icono)
                    .setContentTitle("Titulo")
                    .setContentText("Hola que tal?")
                    .setVibrate(new long[] {100, 250, 100, 500})
                    .setAutoCancel(true);



            mNotifyMgr.notify(1, mBuilder.build());

        }
    });
} }