支持多個span的TextView：SpannableTextView

可接受一個或多個span的TextView。它支持以下spans：

ForegroundColorSpanBackgroundColorSpanCustomTypefaceSpanRelativeSizeSpanURLSpanUnderlineSpanStrikethroughSpanQuoteSpanSubscriptSpanSuperscriptSpan

Sample Usage

 // Setup single span
SpannableTextView tv1 = (SpannableTextView) view.findViewById(R.id.tv1);

Span span1 =
        new Span.Builder("ForegroundSpan, BackgroundSpan, and CustomTypefaceSpan")
                .foregroundColor(R.color.purple_500)
                .backgroundColor(R.color.green_500)
                .typeface(mItalicFont)
                .build();

tv1.setFormattedText(span1);

// Setup multiple spans
SpannableTextView tv2 = (SpannableTextView) view.findViewById(R.id.tv2);

List<Span> spans1 = new ArrayList<>();
spans1.add(new Span.Builder("ForegroundSpan")
        .foregroundColor(R.color.red_500)
        .build());
spans1.add(new Span.Builder("BackgroundSpan")
        .backgroundColor(R.color.yellow_500)
        .build());
spans1.add(new Span.Builder("ForegroundSpan and BackgroundSpan")
        .foregroundColor(R.color.orange_500)
        .backgroundColor(R.color.blue_500)
        .build());
spans1.add(new Span.Builder("ForegroundSpan, BackgroundSpan, and CustomTypefaceSpan")
        .foregroundColor(R.color.green_500)
        .backgroundColor(R.color.indigo_500)
        .typeface(mRegularFont)
        .build());

tv2.setFormattedText(spans1);

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