Provides classes used to view or change the style of a span of text in a View object. The classes with a subclass Standard are passed in to {@link android.text.SpannableString#setSpan(java.lang.Object, int, int, int) SpannableString.setSpan()} or {@link android.text.SpannableStringBuilder#setSpan(java.lang.Object, int, int, int) SpannableStringBuilder.setSpan()} to add a new styled span to a string in a View object.