Android改变一行文字其中几个字的颜色

/**
 * 将0.01变为红色
 */
private void setRedText(TextView tv_tips) {
    SpannableStringBuilder builder = new SpannableStringBuilder("请在您账户中充值0.01元,进行身份验证");
    ForegroundColorSpan span = new ForegroundColorSpan(Color.RED);
    builder.setSpan(span, 8, 12, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv_tips.setText(builder);
}