Here’s your fully updated and enhanced version of the Android MainActivity.java code for a WebView-based app, that:

Loads your login page (https://ommaurya.com/login.php)

Handles internal page navigation (welcome.php, view_lecture.php)

Detects logout.php and redirects user to login

Handles back navigation

Includes improvements for better user experience

✅ Final MainActivity.java Code:
package com.yourappname; // Replace with your actual package name

import android.os.Bundle;
import android.webkit.WebResourceRequest;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.webkit.WebSettings;
import android.webkit.CookieManager;
import android.webkit.WebChromeClient;
import android.os.Build;
import android.annotation.SuppressLint;

import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private WebView webView;
    private final String LOGIN_URL = "https://ommaurya.com/login.php";
    private final String LOGOUT_URL = "https://ommaurya.com/logout.php";

    @SuppressLint("SetJavaScriptEnabled")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        webView = findViewById(R.id.webView);

        // Enable JavaScript
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);

        // Enable cookies (important for session login)
        CookieManager.getInstance().setAcceptCookie(true);

        // Handle redirects and page changes
        webView.setWebViewClient(new WebViewClient() {
            @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
                String url = request.getUrl().toString();

                if (url.contains(LOGOUT_URL)) {
                    // If user hits logout, redirect to login page
                    webView.loadUrl(LOGIN_URL);
                    return true;
                }

                // Allow all other pages to load in WebView
                return false;
            }

            // For older Android versions (optional but safe)
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                if (url.contains(LOGOUT_URL)) {
                    webView.loadUrl(LOGIN_URL);
                    return true;
                }
                return false;
            }
        });

        // Optional: Add progress or alert support
        webView.setWebChromeClient(new WebChromeClient());

        // Load the login page
        webView.loadUrl(LOGIN_URL);
    }

    @Override
    public void onBackPressed() {
        if (webView.canGoBack()) {
            webView.goBack();
        } else {
            super.onBackPressed();
        }
    }
}

📝 activity_main.xml Layout

Make sure this file is present in res/layout/activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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" />

</RelativeLayout>

🛡️ AndroidManifest.xml

Ensure you have Internet permission in AndroidManifest.xml:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.yourappname">

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

    <application
        android:usesCleartextTraffic="false"
        android:allowBackup="true"
        android:label="@string/app_name"
        android:theme="@style/Theme.AppCompat.Light.NoActionBar">

        <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>


📝If you use HTTP (not HTTPS) in the future, you’ll need to set android:usesCleartextTraffic="true" — but you’re currently using HTTPS which is good and secure.

🚀 What This App Does

Loads your login.php page on launch

Lets user navigate to welcome.php, view_lecture.php, etc.

If the user logs out (reaches logout.php), they're redirected back to the login screen

Supports session cookies and back navigation