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