derp

   displayValue = new StringBuilder / TextView / SpannableStringBuilder

    public CustomHeaderView(Context context, AttributeSet attrs) {
        super(context, attrs);
        LayoutInflater.from(context).inflate(R.layout.view_custom_header, this, true);
        setOrientation(VERTICAL);
        int fourDp = context.getResources().getDimensionPixelSize(R.dimen.four_dp);
        setPadding(fourDp, fourDp, fourDp, fourDp);
        setBackgroundColor(Color.WHITE);

        displayValueTV = (TextView) findViewById(R.id.display_value);

       //for holding conversions
        displayValue1Buffer = new StringBuilder();

        displayValueSBuilder = new SpannableStringBuilder();

        ForegroundColorSpan darkGreySpan = new ForegroundColorSpan(context.getResources().getColor(R.color.dark_grey_text));
        StyleSpan boldSpan = new StyleSpan(android.graphics.Typeface.BOLD);

        displayValueSBuilder.append(LITERAL_PREFIX_DISPLAY_VALUE);
        displayValueSBuilder.setSpan(darkGreySpan, 0, LITERAL_PREFIX_DISPLAY_VALUE.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE););
        displayValueSBuilder.setSpan(boldSpan, 0, LITERAL_PREFIX_DISPLAY_VALUE.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE););

    }