MaterialDialog无法设置字体颜色

字体颜色设置不了就设置文字颜色

messages[i] = new SpannableString(datas.get(i).getName());
            messages[i].setSpan(new TextAppearanceSpan(this, R.style.style1), 0, messages[i].length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);