Is there a way of retrieving a TextView's visible line count or range?

Question

I have a full-screen TextView holding a long Spanned that requires scrolling. The TextView\'s getLineCount() gives me the total number of lines used for the entire block of

Answer 1

I figured out the answer:

int height    = myTextView.getHeight();
int scrollY   = myTextView.getScrollY();
Layout layout = myTextView.getLayout();

int firstVisibleLineNumber = layout.getLineForVertical(scrollY);
int lastVisibleLineNumber  = layout.getLineForVertical(scrollY+height);

Answer 2

To make them work you should write the code posted by @Robert in this way:

ViewTreeObserver vto = txtViewEx.getViewTreeObserver();
        vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                ViewTreeObserver obs = txtViewEx.getViewTreeObserver();
                obs.removeOnGlobalLayoutListener(this);
                height = txtViewEx.getHeight();
                scrollY = txtViewEx.getScrollY();
                Layout layout = txtViewEx.getLayout();

                firstVisibleLineNumber = layout.getLineForVertical(scrollY);
                lastVisibleLineNumber = layout.getLineForVertical(height+scrollY);

            }
        });