WebView (App में Website)

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

// Activity
binding.webView.settings.javaScriptEnabled = true
binding.webView.webViewClient = WebViewClient()          // keep links inside the app
binding.webView.loadUrl("https://codingeasily.in/")

// local HTML from assets/ folder
binding.webView.loadUrl("file:///android_asset/privacy.html")

// HTML string
binding.webView.loadDataWithBaseURL(null, "<h1>Hello</h1><p>From Kotlin</p>", "text/html", "UTF-8", null)

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

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

    <com.google.android.material.progressindicator.LinearProgressIndicator
        android:id="@+id/progress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:indeterminate="true" />
</FrameLayout>

package com.codingeasily.studentdiary.ui.help

import android.annotation.SuppressLint
import android.graphics.Bitmap
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.webkit.WebView
import android.webkit.WebViewClient
import androidx.activity.OnBackPressedCallback
import androidx.core.view.isVisible
import androidx.fragment.app.Fragment
import com.codingeasily.studentdiary.databinding.FragmentHelpBinding

/** Shows the online Android tutorial inside the app with a WebView. */
class HelpFragment : Fragment() {

    private var _binding: FragmentHelpBinding? = null
    private val binding get() = _binding!!

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
        _binding = FragmentHelpBinding.inflate(inflater, container, false)
        return binding.root
    }

    @SuppressLint("SetJavaScriptEnabled")
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        binding.webView.settings.javaScriptEnabled = true
        binding.webView.webViewClient = object : WebViewClient() {
            override fun onPageStarted(view: WebView?, url: String?, favicon: Bitmap?) {
                _binding?.progress?.isVisible = true
            }
            override fun onPageFinished(view: WebView?, url: String?) {
                _binding?.progress?.isVisible = false
            }
        }
        // After rotation restore the page the user was reading, otherwise open the tutorial
        if (savedInstanceState == null || binding.webView.restoreState(savedInstanceState) == null) {
            binding.webView.loadUrl(HELP_URL)
        }

        // Back button goes back inside the WebView first
        requireActivity().onBackPressedDispatcher.addCallback(viewLifecycleOwner, object : OnBackPressedCallback(true) {
            override fun handleOnBackPressed() {
                if (binding.webView.canGoBack()) binding.webView.goBack()
                else { isEnabled = false; requireActivity().onBackPressedDispatcher.onBackPressed() }
            }
        })
    }

    override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)
        _binding?.webView?.saveState(outState)
    }

    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
    }

    companion object {
        private const val HELP_URL = "https://codingeasily.in/tutorial/android/"
    }
}

binding.webView.webViewClient = object : WebViewClient() {
    override fun shouldOverrideUrlLoading(view: WebView, request: WebResourceRequest): Boolean {
        val url = request.url
        return if (url.host == "codingeasily.in") {
            false                                        // our site → load in the WebView
        } else {
            startActivity(Intent(Intent.ACTION_VIEW, url)) // others (YouTube, WhatsApp, tel:) → system
            true
        }
    }
}

class AppBridge(private val context: Context) {
    @JavascriptInterface
    fun showToast(message: String) {
        Toast.makeText(context, message, Toast.LENGTH_SHORT).show()
    }
}

binding.webView.addJavascriptInterface(AppBridge(this), "Android")

// in your web page (only on your own trusted site):
// <button onclick="Android.showToast('Saved from the web page!')">Save</button>