Android app development: Kotlin WebView

Kotlin: 1.2.71
Android Studio: 3.2.1

#WebView
It's a view for showing webpage
Official information: https://developer.android.com/reference/android/webkit/WebView
##Before using
You must add internet permission on AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />

##Load webpage
Simply

webView.loadUrl("URL")

Layout (at least needed to show WebView on Fragment) :

webview_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".fragment.WebViewSampleFragment">

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

</FrameLayout>

Here is an example of loading google.com. (Customized with toolbar

##Set some options
Add the options you want to add.

WebViewSampleFragment.kt

webView.apply {
    settings.apply {
        javaScriptEnabled = true
        setSupportZoom(true)
        loadWithOverviewMode = true
        useWideViewPort = true
        domStorageEnabled = true
    }
    webChromeClient = WebChromeClient()
    webViewClient = WebViewClient()
}

Using .apply makes you and others easier to read the code.
##Control WebView

Go Back

webView.goBack()

Also, you can check canGoBack by

webView.canGoBack()

Go Forward

webView.goForward()

Also, you can check canGoForward by

webView.canGoForward()

###Reload

webView.reload()

##Handling WebView
###shouldOverrideUrlLoading(WebView view, WebResourceRequest request)
This is a example of when a URL is about to be loaded in the current WebView.

webViewClient = object : WebViewClient() {
    override fun shouldOverrideUrlLoading(view: WebView?, request: WebResourceRequest?): Boolean {
        view?.loadUrl(request?.url.toString())
        return true
    }
}

#Project:
Code: https://github.com/GalaxyDevGamer/Android-Samples/blob/master/app/src/main/java/galaxysoftware/androidsamples/fragment/WebViewSampleFragment.kt
Layout: https://github.com/GalaxyDevGamer/Android-Samples/blob/master/app/src/main/res/layout/webview_layout.xml