new CountDownTimer(1000, 100) {
                @Override
                public void onTick(long l) {
                    switchOn();
                    switchoff();
                    int x = 4;
                    int y = 10;
                    Toast toast = Toast.makeText(getApplicationContext(),""+l+"",Toast.LENGTH_SHORT);
                    toast.show();
                }

                @Override
                public void onFinish() {

                }
            }.start();