[android-developers] canvas Rich UI

Hi all,
I have put three rich UI options on canvas . I want when user press
U,B or I , the next character(s) must be spanned accordingly. I have
seen setSpan() functions setting already existing strings in my
edittext. But when user type new characters ,these styles don't take
effect. Can someone please help me to solve this problem?
Any code snippet......?
Thanks in advance.

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