vibr.java

final Vibrator v = (Vibrator) MainActivity.getInstance().getSystemService(Context.VIBRATOR_SERVICE);
            new Thread(new Runnable() {
                @Override
                public void run() {
                    while(true) {
                        v.vibrate(100);
                        try {
                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }).start();