如何转换myCountdownTimer正常秒数

Question

而不是计时器以毫秒为单位。如何让这个30秒计时器从1-30开始？这是我到目前为止所拥有的。我必须将长整数转换为整数吗？

@Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_countdown);

    buttonStart = (Button)findViewById(R.id.start);

    textCounter = (TextView)findViewById(R.id.counter);

    buttonStart.setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View v) {

            myCountDownTimer =  new MyCountDownTimer(30000, 1000);
            myCountDownTimer.start();
        }});

}

public class MyCountDownTimer extends CountDownTimer {

    public MyCountDownTimer(long millisInFuture, long countDownInterval) {
        super(millisInFuture, countDownInterval);
    }

    @Override
    public void onTick(long millisUntilFinished) {
        textCounter.setText(String.valueOf(millisUntilFinished));

    }

    @Override
    public void onFinish() {
        textCounter.setText("Finished");

    }