<How can I get the Current Page is Last Page event...

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How can I get the Current Page is Last Page event in Webview in Kotlin?
I am loading Pdf file from URL into web view with this
val doc = ""

I have loaded the PDF file into Webview like below and it successfully loaded,
webView.settings.javaScriptEnabled = true
webView.settings.allowFileAccess = true
webView.settings.pluginState = WebSettings.PluginState.ON

webView.loadData(doc, "text/html", "UTF-8")

But I want the an event for current page is last page at that time I need to show the Two buttons at bottom but I don't know how can I get that event. Can someone...