webview height returns 0

Ali Gürelli :

when I try to below code webview.heigth returns 0. I don't understand whats wrong with the code. I also tried the measuredheight instead of height but the result is still same.

 if (!TextUtils.isEmpty(realtyDetail.descriptionHtml)) {
        webViewHtml.loadData(FormatUtil.formatSpecialCharsForWebView(realtyDetail.descriptionHtml), "text/html; charset=utf-8", "UTF-8")
        ellWebView.visible()
        txtDescription.visible()
        webViewHtml.settings.javaScriptEnabled = true

        val vto = view!!.viewTreeObserver;
        vto.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
            override fun onGlobalLayout() {
                if (vto.isAlive) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                        vto.removeOnGlobalLayoutListener(this)
                    } else {
                        @Suppress("DEPRECATION")
                        vto.removeGlobalOnLayoutListener(this)
                    }
                    if (!webViewHtmlSet && webViewHtml != null) {
                        val limit = DeviceUtil.convertDpToPixel(400f, context)

                        if (webViewHtml.height > limit) {
                            setWebView(limit)
                        }
                    }
                }
            }
        })

layout:

 <WebView
        android:id="@+id/webViewHtml"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

html:(my webview height is wrap_content but only below html not working)

<font style="font-size:22px"><font style="background-color:#00ff00"><font style="color:#000000"><i>KOCAELİ KARAMÜRSEL AVCİ KOYDE KÖY CIVARI MEVKİNDE 723M2 MUSTEKİL PARSEL SATILIK TIR <br/></i></font></font></font><font style="font-size:22px"><font style="background-color:#00ff00"><font style="color:#000000"><i><br/></i></font></font></font><font style="font-size:22px"><font style="background-color:#00ff00"><font style="color:#000000"><i>PARKE YOLA CEPHE LI DÜMDÜZ &#37;30 KONUT IMARLI ARSA,DIR DÜMDÜZ CEVİZ BAHÇESİ ELEKTRİK HATTI ŞEBEKE SU HATTI YANINDAN GEÇMEKTEDİR KANALIZASYON TÜM ALT YAPILARI TAMAMLANMIŞ TIR TOPLU ULAŞIM VARDIR ARADIĞINIZ HER ŞEY YÜRÜ ME MESAFESINDE DİR CAMI KAHVANE BERBER NALBUR PETROL OFİSİ SAĞLIK OCAĞI İTFAİYE ILKÖĞRETİM <br/></i></font></font></font><font style="font-size:22px"><font style="background-color:#00ff00"><font style="color:#000000"><i><br/></i></font></font></font><font style="font-size:22px"><font style="background-color:#00ff00"><font style="color:#000000"><i>Not istek halinda yan KOMŞU  parselde SATILIK 1013m2<br/></i></font></font></font><font style="font-size:22px"><font style="background-color:#00ff00"><font style="color:#000000"><i><br/></i></font></font></font><font style="font-size:22px"><font style="background-color:#00ff00"><font style="color:#ff0000"><i>DAHA DETAYLI BILGI ALMAK İÇİN BIZI ARAYINIZ </i></font></font></font>

by the way this is working on simulator but on real device the html doesn't work and the height returns 0.

Jayanth :

Attach viewTreeObserver to the WebView on onPageFinished() callback on the WebViewClient like below. it gives the exact height of your webView.

  webView.webViewClient = Client()
    webView.loadData(Base64.encodeToString("<font style=\"font-size:22px\"><font style=\"background-color:#00ff00\"><font style=\"color:#000000\"><i>KOCAELİ KARAMÜRSEL AVCİ KOYDE KÖY CIVARI MEVKİNDE 723M2 MUSTEKİL PARSEL SATILIK TIR <br/></i></font></font></font><font style=\"font-size:22px\"><font style=\"background-color:#00ff00\"><font style=\"color:#000000\"><i><br/></i></font></font></font><font style=\"font-size:22px\"><font style=\"background-color:#00ff00\"><font style=\"color:#000000\"><i>PARKE YOLA CEPHE LI DÜMDÜZ &#37;30 KONUT IMARLI ARSA,DIR DÜMDÜZ CEVİZ BAHÇESİ ELEKTRİK HATTI ŞEBEKE SU HATTI YANINDAN GEÇMEKTEDİR KANALIZASYON TÜM ALT YAPILARI TAMAMLANMIŞ TIR TOPLU ULAŞIM VARDIR ARADIĞINIZ HER ŞEY YÜRÜ ME MESAFESINDE DİR CAMI KAHVANE BERBER NALBUR PETROL OFİSİ SAĞLIK OCAĞI İTFAİYE ILKÖĞRETİM <br/></i></font></font></font><font style=\"font-size:22px\"><font style=\"background-color:#00ff00\"><font style=\"color:#000000\"><i><br/></i></font></font></font><font style=\"font-size:22px\"><font style=\"background-color:#00ff00\"><font style=\"color:#000000\"><i>Not istek halinda yan KOMŞU  parselde SATILIK 1013m2<br/></i></font></font></font><font style=\"font-size:22px\"><font style=\"background-color:#00ff00\"><font style=\"color:#000000\"><i><br/></i></font></font></font><font style=\"font-size:22px\"><font style=\"background-color:#00ff00\"><font style=\"color:#ff0000\"><i>DAHA DETAYLI BILGI ALMAK İÇİN BIZI ARAYINIZ </i></font></font></font>".toByteArray(), Base64.NO_PADDING), "text/html", "base64")

....

private inner class Client: WebViewClient(){
        override fun onPageFinished(view: WebView?, url: String?) {
            super.onPageFinished(view, url)
            webView.viewTreeObserver.addOnGlobalLayoutListener {
                Log.d("xifi", "${webView.height}")
            }
        }
    }

This is the output I got for your HTML