How to remove UnderlineSpan() text using button click-CodePudding

I am trying things out by creating a small notepad project. And now i am having a hard time finding a solution to remove the underline on text. I can set it but i cant remove it.

Heres my code:

Heres how i set it

I use span to get the selected text

selectedString.setSpan(UnderlineSpan(), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

Heres how i am trying to unset it

selectedString.setSpan(UnderlineSpan().updateDrawState(TextPaint().apply { isUnderlineText = false }), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

I tried to search for a solution but no luck can someone help me? thanks in advance!

CodePudding user response：

You can declare a class like this

class NoUnderlineSpan : UnderlineSpan() {
    override fun updateDrawState(ds: TextPaint) {
        ds.color = ds.linkColor
        ds.isUnderlineText = false
    }
}

Then use NoUnderlineSpan just like you use UnderlineSpan

Or you can try this lib I wrote ：SpannableStringDslExtension

CodePudding user response：

If you want to remove all styling of the text, you could just use toString() on the spannable and it would remove everything.

If you just want to remove the styling of a part of the spannable, just make an anonymous object of UnderlineSpan and override its updateDrawState method

val underlineRemoveSpan = object : UnderlineSpan() {
    override fun updateDrawState(ds: TextPaint) {
        ds.isUnderlineText = false
    }
}

selectedString.setSpan(underlineRemoveSpan, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

selectedString.setSpan(UnderlineSpan().updateDrawState(TextPaint().apply { isUnderlineText = false }), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

This isn't working because, on calling updateDrawState with a new TextPaint after setting isUnderlineText to false. The implementation of updateDrawState in UnderlineSpan class, sets it to true, which is why underline is not removing.