安卓设置某些文字的字体颜色

//private BackgroundColorSpan span = new (Color.RED);//文字背景色
private ForegroundColorSpan span = new ForegroundColorSpan(Color.RED);//字体颜色
if (null != bean) {    // vh.mNameTv.setText(bean.getSgName());    vh.mDesTv.setText(bean.getSgDescribe());    vh.mPetNmaeTv.setText(bean.getSgPetName());    vh.mHeadImg.setImageResource(bean.getSgHeadBp());    String username = bean.getSgName();    int index = username.indexOf(result, 0);    Log.e("logcat", "result=" + result + ";username=" + username + ";index=" + index);    if (index < 0) {        vh.mNameTv.setText(username);    } else {//设置username中，包含的result这些字的颜色为红色        SpannableString spanString = new SpannableString(username);        spanString.setSpan(span, index, index + result.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);        vh.mNameTv.setText(spanString);    }}