webview

activity.kt

rssdetWebView.loadUrl(rssItem.link)
rssdetWebView.webChromeClient = object : WebChromeClient() {
    override fun onProgressChanged(view: WebView?,
                                   newProgress: Int) {
        progressBar.progress = newProgress
        if (progress == 100) progressBar.visibility = View.GONE
        else progressBar.visibility = View.VISIBLE
    }
}

activity.xml

<ProgressBar
    android:id="@+id/progressBar"
    style="?android:attr/progressBarStyleHorizontal"
    android:layout_width="0dp"
    android:layout_height="2dp"
    app:layout_constraintTop_toBottomOf="@id/rssdetDivBottom"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintEnd_toEndOf="parent"/>

<WebView
    android:id="@+id/rssdetWebView"
    android:layout_width="0dp"
    android:layout_height="300dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@id/progressBar" />