效果：（可不设置 之前、之后文字）

/**
 * 倒计时秒数
 *
 * @desc : 时分秒倒计时view
 * 
 * 布局里引用后，
 *     private fun testMethod(){
 *         binding.test.setCDownStarText("之前的文字")
 *         binding.test.setCDownEndText("之后的文字")
 *         binding.test.setCDownDuration(86400*4*1000)//4天
 *         binding.test.setShowUnit(true)//显示倒计时 单位
 *         binding.test.setCountDownFinishListener {
 *             Log.e("测试","倒计时完成")
 *         }
 *     }
 */
public class CountDownTextView extends AppCompatTextView {

    //是否显示倒计时单位，默认不展示
    private boolean mShowUnit;
    private CountDownTimer mCountDownTimer;
    //倒计时 前方展示的文字
    private String mCDownStarText = "";
    //倒计时 后方展示的文字
    private String mCDownEndText = "";
    //倒计时文字 颜色
    private int mCDownTextColor = getResources().getColor(R.color.jiuytguhygtf_rvtygtfrdx_purphuygtyppp);


    public CountDownTextView(Context context, AttributeSet attributeSet) {
        super(context, attributeSet);
    }


    public void setCDownDuration(long duration) {
        if (mCountDownTimer != null) {
            mCountDownTimer.cancel();
        }

        mCountDownTimer = new CountDownTimer(duration, 1000) {
            @Override
            public void onTick(long millisUntilFinished) {
                long secondsNum = (millisUntilFinished / 1000) % 60;
                long minutesNum = (millisUntilFinished / (1000 * 60)) % 60;
                long hourNum = (millisUntilFinished / (1000 * 60 * 60)) % 24;
                long dayNum = (millisUntilFinished / (1000 * 60 * 60 * 24));

//                Log.e("测试", "毫秒值 =" + millisUntilFinished + " 天 =" + dayNum + " 时 =" + hourNum + " 分 =" + minutesNum + " 秒 =" + secondsNum);

                String countDownText = "";//天时分秒
                if (mShowUnit) {
                    //-------------------国内简单使用----------------------
                    countDownText = String.format("%d天%02d小时%02d分%02d秒", dayNum, hourNum, minutesNum, secondsNum);//时分秒

//                    //-------------------国际化使用----------------------
//                    String day = Kwxecrvtbygtfrdesdrf.Companion.get().getString(R.string.day);
//                    String hour = Kwxecrvtbygtfrdesdrf.Companion.get().getString(R.string.hour);
//                    String minutes = Kwxecrvtbygtfrdesdrf.Companion.get().getString(R.string.minutes);
//                    String seconds = Kwxecrvtbygtfrdesdrf.Companion.get().getString(R.string.seconds);
//
//                    countDownText = String.format(("%d" + day + "%02d" + hour + "%02d" + minutes + "%02d" + seconds), dayNum, hourNum, minutesNum, secondsNum);//时分秒
//                    //-------------------国际化使用----------------------
                } else {
                    countDownText = String.format("%d:%02d:%02d:%02d", dayNum, hourNum, minutesNum, secondsNum);//时分秒
                }
                SpannableStringBuilder spannableSb = new SpannableStringBuilder(mCDownStarText + countDownText + mCDownEndText);
                ForegroundColorSpan foregroundColorSpan = new ForegroundColorSpan(mCDownTextColor);
                spannableSb.setSpan(foregroundColorSpan, mCDownStarText.length(), mCDownStarText.length() + countDownText.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

                setText(spannableSb);
            }

            @Override
            public void onFinish() {
                setText(mCDownStarText + mCDownEndText);

                if (mCountDownFinishListener != null) {
                    mCountDownFinishListener.countDownFinishListener();
                }
                if (mCountDownTimer != null) {
                    mCountDownTimer.cancel();
                }
            }
        };

        mCountDownTimer.start();
    }

    /**
     * 是否显示倒计时单位
     *
     * @param showUnit
     */
    public void setShowUnit(boolean showUnit) {
        mShowUnit = showUnit;
    }

    /**
     * 倒计时文字 颜色
     *
     * @param textColor
     */
    public void setCDownTextColor(int textColor) {
        mCDownTextColor = textColor;
    }

    /**
     * 倒计时 前方展示的文字（可不设置）
     *
     * @param starText
     */
    public void setCDownStarText(String starText) {
        mCDownStarText = starText;
    }

    /**
     * 倒计时 后方展示的文字（可不设置）
     *
     * @param endText
     */
    public void setCDownEndText(String endText) {
        mCDownEndText = endText;
    }

    /**
     * 倒计时完成监听回调
     */
    private CountDownFinishListener mCountDownFinishListener;

    public interface CountDownFinishListener {
        void countDownFinishListener();
    }

    public void setCountDownFinishListener(CountDownFinishListener listener) {
        this.mCountDownFinishListener = listener;
    }

}