Custom Digital Clock in Android

digitalClockTv = (TextView) findViewById(R.id.digitalClockTv);
countDownTimer = new CountDownTimer(1000000000, 1000) {

    public void onTick(long millisUntilFinished) {
        String hour, minit, sec;
        Calendar c = Calendar.getInstance();
        hour = String.valueOf(c.get(Calendar.HOUR));
        minit = String.valueOf(c.get(Calendar.MINUTE));
        sec = String.valueOf(c.get(Calendar.SECOND));
        int a = c.get(Calendar.AM_PM);
        if (hour.length() == 1) {
            hour = getString(R.string.zero) + hour;
        }
        if (minit.length() == 1) {
            minit = getString(R.string.zero) + minit;
        }
        if (sec.length() == 1) {
            sec = getString(R.string.zero) + sec;
        }
        if (a == Calendar.AM) {
            digitalClockTv.setText(hour + getString(R.string.colon) + minit + getString(R.string.colon) + sec + getString(R.string.am));
        } else {
            digitalClockTv.setText(hour + getString(R.string.colon) + minit + getString(R.string.colon) + sec + getString(R.string.pm));
        }
    }

    public void onFinish() {
    }
};
countDownTimer.start();

Thank You