Use RelativeSizeSpan with TextView's textAllCaps at true is not working

Question

All in the title.

Is it a bug or a desired behaviour ? And in the last case, i can't understand why ?

Answer 1

Probably a bug or mutual exclusion.

When textAllCaps is set TextView applies TransformationMethod that takes the text and converting it to plain Strings that makes source text CharSequence loose all other stylings and spans.

You can trick it programatically like (Kotlin naive):

 val text = textView.text // at this point allCaps is applied so text is caps
 textView.setAllCaps(false) // remove the allCaps
 val spannable = SpannableString(text) // create new spannable with allCapped text 
 spannable.setSpan(RelativeSizeSpan(1f), 0, text.length, SpannableString.SPAN_EXCLUSIVE_EXCLUSIVE)
 textView.text = spannable //set it.

Another approach is creating your own TransformationMethod that will apply your Span for every text that is set.