is method; you may only examine it for context.
 
 Note: If <var>source</var> is an instance of <code><a href="../../../../reference/android/text/Spanned.html">Spanned</a></code> or
 <code><a href="../../../../reference/android/text/Spannable.html">Spannable</a></code>, the span objects in the <var>source</var> should be 
 copied into the filtered result (i.e. the non-null return value). 
 <code><a href="../../../../reference/android/text/TextUtils.html#copySpansFrom(android.text.Spanned, int, int, java.lan