How to get line count of textview before rendering?

Question

How can I get the number of lines a string will take up in a TextView before it is rendered.

A ViewTreeObserver will not work because thos

Answer 1

If you know or can determine the width of the TextView's parent, you are able to invoke a view measurement which results in line count being calculated.

val parentWidth = PARENT_WIDTH // assumes this is known/can be found
myTextView.measure(
    MeasureSpec.makeMeasureSpec(parentWidth, MeasureSpec.EXACTLY),
    MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED))

The TextView's layout is no longer null and you can check the calculated line count with myTextView.lineCount.