How to listen for a WebView finishing loading a URL in Android using Kotlin?

This example demonstrates how to listen for a WebView finishing loading a URL in Android using Kotlin.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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"    android:padding="4dp"    tools:context=".MainActivity">    <TextView       android:id="@+id/textView"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:padding="5dp"       android:textColor="#000000"       android:textSize="24sp" />    <WebView       android:id="@+id/webView"       android:layout_width="match_parent"       android:layout_height="match_parent"       android:layout_above="@id/btnLoad"       android:layout_below="@id/textView" />    <Button       android:id="@+id/btnLoad"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_alignParentBottom="true"       android:text="Load URL" /> </RelativeLayout>

Step 3 − Add the following code to src/MainActivity.kt

import android.os.Bundle import android.webkit.WebChromeClient import android.webkit.WebView import android.webkit.WebViewClient import android.widget.Button import android.widget.TextView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    lateinit var webView: WebView    lateinit var textView: TextView    private lateinit var btnLoad: Button    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       title = "KotlinApp"       textView = findViewById(R.id.textView)       btnLoad = findViewById(R.id.btnLoad)       webView = findViewById(R.id.webView)       webView.webViewClient = WebViewClient()       btnLoad.setOnClickListener {          webView.webViewClient = object : WebViewClient() {             override fun onPageFinished(view: WebView, weburl: String) {                Toast.makeText(this@MainActivity, "Your WebView is Loaded....",                Toast.LENGTH_LONG).show()             }          }          webView.webChromeClient = object : WebChromeClient() {             override fun onProgressChanged(view: WebView, newProgress: Int) {                textView.text = "Page loading : $newProgress%"                if (newProgress == 100) {                   textView.text = "Page Loaded."                }             }          }          webView.loadUrl("https://www.tutorialspoint.com")       }    } }

Step 4 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.q11">    <uses-permission android:name="android.permission.INTERNET" />    <application       android:allowBackup="true"       android:icon="@mipmap/ic_launcher"       android:label="@string/app_name"       android:roundIcon="@mipmap/ic_launcher_round"       android:supportsRtl="true"       android:theme="@style/AppTheme">       <activity android:name=".MainActivity">          <intent-filter>             <action android:name="android.intent.action.MAIN" />             <category android:name="android.intent.category.LAUNCHER" />          </intent-filter>       </activity>    </application> </manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen