Dotted Underline Position Changed After Changing Orientation

I have done the the multi line text support from below link Dotted underline TextView not wrapping to the next line using SpannableString in Android After changing the orientation

Solution 1:

Referring to the original question you mention in this question and assuming that you are using the "DottedUnderlineSpan" from the original question, you will need to make the following changes:

The annotation spans are replaced with ReplacementSpans which must be explicitly recomputed ince you are handling orientation changes yourself. Once the annotation spans are set, do not remove them. They will remain valid across orientation changes.

The ReplacementSpans will, however, need to change. Upon orientation change, remove the replacement spans, allow layout to proceed and then recalculate the ReplacementSpans as shown in the following code and that should do it.

overridefunonConfigurationChanged(newConfig: Configuration) {
    super.onConfigurationChanged(newConfig)

    val textView1 = findViewById<TextView>(R.id.textView1)
    removeUnderlineSpans(textView1)
    textView1.viewTreeObserver.addOnPreDrawListener(
        object : ViewTreeObserver.OnPreDrawListener {
            overridefunonPreDraw(): Boolean {
                textView1.viewTreeObserver.removeOnPreDrawListener(this)
                replaceAnnotations(textView1)
                returnfalse
            }
        }
    )
}

privatefunremoveUnderlineSpans(textView: TextView) {
    val text = textView.text as Spannable
    val spans = text.getSpans(0, text.length, DottedUnderlineSpan::class.java)
    spans.forEach { span ->
        text.removeSpan(span)
    }
    textView.setText(text, TextView.BufferType.SPANNABLE)
}

privatefunreplaceAnnotations(textView: TextView) {
    val text = SpannableString(textView.text)
    val spans =
        text.getSpans(0, text.length, Annotation::class.java).filter { span ->
            span.key == ANNOTATION_FOR_UNDERLINE
        }
    if (spans.isNotEmpty()) {
        val layout = textView.layout
        spans.forEach { span ->
            replaceAnnotationSpan(text, span, layout)
        }
        textView.setText(text, TextView.BufferType.SPANNABLE)
    }
}