Webview tutorials code using kotlin in android studio

 webview.settings.displayZoomControls = false
          webview.loadUrl("http://www.joklinztech.com")

          webview.webViewClient = WebViewClient()
          webview.webChromeClient = object : WebChromeClient() {
              override fun onProgressChanged(view: WebView?, newProgress: Int) {
                  super.onProgressChanged(view, newProgress)
                  val loadingProgressBar = findViewById<View>(R.id.progressBar2) as ProgressBar

                  loadingProgressBar.progress = newProgress
                  //loadingTitle.setProgress(newProgress);
                  // hide the progress bar if the loading is complete

                  if (newProgress == 100) {
                      loadingProgressBar.visibility = View.GONE
                      webview.visibility = View.VISIBLE
                  } else {
                      loadingProgressBar.visibility = View.VISIBLE

                  }

              }

          }
      }
        else
      {
          alert("please exit app","No Internet Connection ")
          {
              yesButton { finish() }
              noButton {toast("no internet connection")}
          }.show()
      }


    }

    override fun onBackPressed() {
        val webview = findViewById<View>(R.id.WebView) as WebView
        if(webview.canGoBack()) {
            webview.goBack()
        } else {
            super.onBackPressed()
        }
    }

    override fun onCreateOptionsMenu(menu: Menu): Boolean {
        // Inflate the menu; this adds items to the action bar if it is present.
        menuInflater.inflate(R.menu.menu_main, menu)
        return true
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        val id = item.itemId

         if (id == R.id.action_settings) {
         email("wise4rmgod@gmail.com")
        }
        if (id == R.id.action_setting) {
             finish()
        }

        if (id == R.id.action_settin) {
             share("Joklinztech is a tech community that will keep you up to date with all the tech infos in 9ja " +
                     "and across the world,our services include android tutorials using kotlin,graphics" +
                     " design,animation,web designing/development","Joklinztech the home for young techz")
        }
        return super.onOptionsItemSelected(item)

    }



}









XML SECTION



<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.andela.smithnwokocha.joklintechapp.MainActivity">

    <!-- view for AdMob Banner Ad -->

    <com.google.android.gms.ads.AdView
        android:id="@+id/adView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        ads:adSize="BANNER"
        ads:adUnitId="@string/banner_ad_unit_id" />


    <ProgressBar
        android:id="@+id/progressBar2"
        style="?android:attr/progressBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerInParent="true"
        tools:layout_editor_absoluteX="167dp"
        tools:layout_editor_absoluteY="215dp" />

    <WebView
        android:id="@+id/WebView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/adView"
        android:layout_centerHorizontal="true"
        android:layout_centerInParent="true"
        android:layout_centerVertical="true"
        android:layout_marginBottom="5dp"
        android:visibility="gone">


    </WebView>

</RelativeLayout>