CountDownTimer倒计时器的使用

public class MainActivity extends AppCompatActivity{

        private TextView test;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
             test = (TextView) findViewById(R.id.test);
             timer.start();
    }
      private CountDownTimer timer = new CountDownTimer(60000, 1000) {

        @Override
        public void onTick(long millisUntilFinished) {
            test.setText((millisUntilFinished / 1000) + "秒后可重发");
        }

        @Override
        public void onFinish() {
            test.setText("获取验证码");
        }
    };

}