倒计时工具类

			@BindView(R.id.get_code)
    		TextView getCode;
    		
			CountDownTimerUtils countDownTimerUtils = new CountDownTimerUtils(getCode, 60000, 1000);
            countDownTimerUtils.start();

public class CountDownTimerUtils extends CountDownTimer {
    WeakReference<TextView> tvCodeWr;//控件软引用，防止内存泄漏
    CountDownTimer timer;

    /**
     * @param textView          The TextView
     * @param millisInFuture    The number of millis in the future from the call
     *                          to {@link #start()} until the countdown is done and {@link #onFinish()}
     *                          is called.
     * @param countDownInterval The interval along the way to receiver
     *                          {@link #onTick(long)} callbacks.
     */
    public CountDownTimerUtils(TextView textView, long millisInFuture, long countDownInterval) {
        super(millisInFuture, countDownInterval);
        tvCodeWr = new WeakReference<>(textView);
        timer = this;
    }

    @Override
    public void onTick(long millisUntilFinished) {
        TextView mTextView = tvCodeWr.get();
        if (mTextView != null) {
            mTextView.setClickable(false); //设置不可点击
            mTextView.setText(millisUntilFinished / 1000 + "秒");  //设置倒计时时间
            //    mTextView.setBackgroundResource(R.drawable.bg_identify_code_press); //设置按钮为灰色，这时是不能点击的

            /**
             * 超链接 URLSpan
             * 文字背景颜色 BackgroundColorSpan
             * 文字颜色 ForegroundColorSpan
             * 字体大小 AbsoluteSizeSpan
             * 粗体、斜体 StyleSpan
             * 删除线 StrikethroughSpan
             * 下划线 UnderlineSpan
             * 图片 ImageSpan
             * http://blog.csdn.net/ah200614435/article/details/7914459
             */
            SpannableString spannableString = new SpannableString(mTextView.getText().toString());  //获取按钮上的文字
            ForegroundColorSpan span = new ForegroundColorSpan(Color.RED);
            /**
             * public void setSpan(Object what, int start, int end, int flags) {
             * 主要是start跟end，start是起始位置,无论中英文，都算一个。
             * 从0开始计算起。end是结束位置，所以处理的文字，包含开始位置，但不包含结束位置。
             */
            spannableString.setSpan(span, 0, 2, Spannable.SPAN_INCLUSIVE_EXCLUSIVE);//将倒计时的时间设置为红色
            mTextView.setText(spannableString);
        } else {
            if (timer != null) {
                timer.cancel();
                timer = null;
            }
        }
    }

    @Override
    public void onFinish() {
        TextView mTextView = tvCodeWr.get();
        if (mTextView != null) {
            mTextView.setText("获取验证码");
            mTextView.setClickable(true);//重新获得点击
        } else {
            if (timer != null) {
                timer.cancel();
                timer = null;
            }
        }
    }

}