Android應用中怎么實現(xiàn)一個驗證碼倒計時功能

  /**
  * 短信驗證碼倒計時
  */
 private void startTimer() {
  registerVerificationCodeTv.setTextColor(getResources().getColor(R.color.text_color_code_green));
  registerVerificationCodeTv.setText(getResources().getString(R.string.timer_default_show));
  registerVerificationCodeTv.setEnabled(false);
  new Thread() {
   @Override
   public void run() {
    for (int i = 59; i >= 0; i--) {
     final int second = i;
     try {
      Thread.sleep(1000);
     } catch (InterruptedException e) {
      e.printStackTrace();
     }
     runOnUiThread(new Runnable() {
      @Override
      public void run() {
       if (second <= 0) {
        registerVerificationCodeTv.setTextColor(getResources().getColor(R.color.text_get_verification_code));
        registerVerificationCodeTv.setText(getResources().getString(R.string.register_re_get_verification_code));
        registerVerificationCodeTv.setEnabled(true);
       } else {
        registerVerificationCodeTv.setTextColor(getResources().getColor(R.color.text_color_code_green));
        registerVerificationCodeTv.setText(second + "s");
       }
      }
     });
    }
   }
  }.start();
 }