Custom font span

CustomTypefaceSpan.java

public class CustomTypefaceSpan extends MetricAffectingSpan {
    private final Typeface mTypeface;

    public CustomTypefaceSpan(final Typeface typeface) {
        this.mTypeface = typeface;
    }

    @Override
    public void updateDrawState(final TextPaint drawState) {
        apply(drawState);
    }

    @Override
    public void updateMeasureState(final TextPaint paint) {
        apply(paint);
    }

    private void apply(final Paint paint) {
        final Typeface oldTypeface = paint.getTypeface();
        final int oldStyle = oldTypeface != null ? oldTypeface.getStyle() : 0;
        final int fakeStyle = oldStyle & ~mTypeface.getStyle();

        if ((fakeStyle & Typeface.BOLD) != 0) {
            paint.setFakeBoldText(true);
        }

        if ((fakeStyle & Typeface.ITALIC) != 0) {
            paint.setTextSkewX(-0.25f);
        }

        paint.setTypeface(mTypeface);
    }
}