Spannable Text在Dialog Fragment中不起作用

我已经添加TextView了我的Dialog片段,并在此动态显示Spannable数据TextView.但它不适用于文本的Spannable效果.

这是我的代码,用于生成Three Spannable String并添加到TextView中.

 TextView  textViewTicketSummary = (TextView) dialog.findViewById(R.id.ticketSummaryTextView);
 SpannableStringBuilder summary = new SpannableStringBuilder();
    SpannableString VehicleCaptureSpan, TotalVehicleSpan, DurationTimeSpan;

    String VehicleCapture = "Total Vehicles Captured:9";
    VehicleCaptureSpan = new SpannableString(VehicleCapture);
    VehicleCaptureSpan.setSpan(new StyleSpan(Typeface.BOLD), 0, VehicleCapture.length(), 0);
    VehicleCaptureSpan.setSpan(new ForegroundColorSpan(Color.RED), 0, VehicleCapture.length(), 0);
    VehicleCaptureSpan.setSpan(new RelativeSizeSpan(1.5f), 0, VehicleCapture.length(), 0);

    String TotalVehicle = "Total Car Park Capacity:10 ";
    TotalVehicleSpan = new SpannableString(TotalVehicle);
    TotalVehicleSpan.setSpan(new StyleSpan(Typeface.BOLD), 0, TotalVehicle.length(), 0);
    TotalVehicleSpan.setSpan(new ForegroundColorSpan(Color.RED), 0, TotalVehicle.length(), 0);
    TotalVehicleSpan.setSpan(new RelativeSizeSpan(1.5f), 0, TotalVehicle.length(), 0);

    String DurationTime = "Total Duration: 0 Min 3 Secs ";
    DurationTimeSpan = new SpannableString(DurationTime);
    DurationTimeSpan.setSpan(new StyleSpan(Typeface.BOLD), 0, DurationTime.length(), 0);
    DurationTimeSpan.setSpan(new ForegroundColorSpan(Color.RED), 0, DurationTime.length(), 0);
    DurationTimeSpan.setSpan(new RelativeSizeSpan(1.5f), 0, DurationTime.length(), 0);

    summary.append(VehicleCapture).append("\n\n")
            .append(TotalVehicle).append("\n\n")
            .append(DurationTime).append("\n");

    textViewTicketSummary.setText(summary, TextView.BufferType.SPANNABLE);

这是我的布局:

这是输出:

请给我一些提示.为什么它不起作用Dialog Fragment？