Android: Making a button visible once webview is done scrolling

Question

I have a webview which shows an html file. When the user scrolls to the bottom of this file in webview, I want a button that was previously hidden to show up, which the user

Answer 1

[I can't comment on an answer, so leaving my comment here as a new answer]

karora's answer (the first) works very well, except that in the

protected void onScrollChanged(int left, int top, int oldLeft, int oldTop)

method, calling

getContentHeight()

was wildly inaccurate for me. It reported a value much too small, so my listener was called when the user had only scrolled maybe a third of the way down the WebView. I used

computeVerticalScrollRange()

instead, and that is perfect. Thanks to this post for that helpful hint.