說明：大部分內容都是參考別的文章，這裡做整理是為了以後的程式設計有實用的模板，可以即需即用。

1、倒計時

public class RegisterActivity extends BaseActivity {
    private TimeCount mTimeCount;
    ...
        mTvGetVerifyCode.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mTimeCount =
 
 new TimeCount(59000, 1000);
                mTimeCount.start();
            }
        });
    ...
    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mTimeCount != null) {
            mTimeCount.cancel();
        }
    }
    ...
    class TimeCount extends CountDownTimer
 
 {

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

        @Override
        public void onTick(long millisUntilFinished) {
            mTvGetVerifyCode.setClickable(false);
            mTvGetVerifyCode.setText
 
(millisUntilFinished / 1000 + "s");
        }

        @Override
        public void onFinish() {
            mTvGetVerifyCode.setText("獲取驗證碼");
            mTvGetVerifyCode.setClickable(true);
        }
    }
}