Android之TextView密码输入变星号时间

private static class Visible extends Handler implements UpdateLayout, Runnable{

　
        public Visible(Spannable sp, PasswordTransformationMethod ptm) {
            mText = sp;
            mTransformer = ptm;
            postAtTime(this, SystemClock.uptimeMillis() + 1500);
        }

        public void run() {
            mText.removeSpan(this);
        }

        private Spannable mText;
        private PasswordTransformationMethod mTransformer;
    }