Buy & Sell Classified Android App with PHP Backend Buy & Sell Classified is a complete Android marketplace application designed for building a modern classified ads platform where users can browse, discover, and manage buy-and-sell listings through a clean and responsive mobile interface. The application is developed for Android 16 with SDK 36 and includes the complete Android Studio source code, full PHP server-side source code, and offline documentation. It is suitable for developers, startups, agencies, and entrepreneurs who want to launch a classified marketplace for local products, second-hand items, electronics, fashion, vehicles, property listings, home products, and many other categories. Android 16 and SDK 36 Ready The application is developed with modern Android compatibility in mind and supports Android 16 with SDK 36. This makes the project suitable for developers looking for an updated Android source code base for current devices and modern Android development environments. Complete Classified Marketplace The app can be used to create a complete buy-and-sell marketplace for different types of classified listings. Possible marketplace categories include: Electronics Mobile Phones Fashion Home and Living Vehicles Property Used Products Local Products Accessories General Classified Listings Google Login Google login integration allows users to sign in using their Google account after the required credentials are configured. This provides a simple and convenient authentication option for users. RTL Support The application supports Right-to-Left layouts. This makes it suitable for RTL languages such as: Arabic Urdu Persian Other supported RTL languages Dark and Light Mode The app includes both dark and light themes. Users can enjoy a modern interface according to their preferred visual style. Modern Material Design UI The application uses a clean Material Design interface to provide a modern and user-friendly experience. The navigation and screen layout are designed to be simple, responsive, and easy to use. Load More on Scroll The application supports loading additional listings automatically while scrolling. This helps create a smoother browsing experience without requiring users to manually switch between multiple pages. OneSignal Push Notifications OneSignal notification integration is included. Administrators can use push notifications for: New listing alerts App announcements User notifications Promotions Important updates A separate OneSignal account and credentials are required. Firebase Integration Firebase and Google Services integration are included in the Android project. Firebase can be used for configured services such as authentication, notifications, analytics, and other supported Google services. Network Availability Check The application can detect whether an internet connection is available. This helps improve user experience when the device is offline or experiencing connection problems. Navigation Menu The app includes an organized navigation menu that allows users to move easily between different sections of the marketplace. Multiple Ad Network Support The application supports integration with multiple advertising networks. Supported integrations include: Google AdMob Meta Audience Network StartApp ironSource AppLovin Unity Ads Yandex Ads This gives app owners flexibility when selecting monetization providers. Third-party ad network accounts, API credentials, approvals, and service fees are not included. Easy Customization The Android Studio project can be customized according to the buyer's requirements. Developers can modify: App name Package name Logo Colors Icons Layouts Firebase configuration Google login OneSignal settings Ad network IDs Backend URL Other project settings Complete PHP Backend The package includes the full PHP server-side source code required by the Android application. This allows buyers to manage and customize both the mobile application and backend system. Full Android Source Code The complete Android Studio project is included. Developers can open the project in Android Studio, update the configuration, customize the design, and generate their own APK or AAB build. What You Will Get Full Android Source Code Full PHP Server-Side Source Code Android Studio Project Backend Project Files Required Application Resources Offline Documentation Server Requirements The backend requires PHP 8.1 or higher. Required PHP extensions include: Intl Ctype cURL DOM Fileinfo Filter Hash Mbstring OpenSSL PCRE PDO Session Tokenizer XML GD or Imagick PHP ZIP Archive Additional requirements: Apache or Nginx Rewrite module enabled Hosting or VPS Domain or subdomain SSL certificate recommended Database access where required File Manager, FTP, or SSH access Android Requirements Android Studio Android SDK 36 Android 16 compatible development environment Firebase project Google Services configuration OneSignal account if notifications are used Google OAuth configuration for Google login Ad network accounts for enabled advertising networks Third-Party Services Notice The following accounts and credentials are not included: Google Play Developer account Firebase credentials Google login credentials OneSignal credentials AdMob account Meta Audience Network account StartApp account ironSource account AppLovin account Unity Ads account Yandex Ads account Hosting Domain SSL certificate The buyer must obtain and configure the required third-party accounts separately. Suitable For This application can be used for: Classified Marketplace Apps Buy and Sell Apps Local Marketplace Apps Used Product Marketplaces Electronics Marketplaces Vehicle Listings Property Listings Fashion Classified Apps General Marketplace Projects Startup Marketplace Businesses The project provides a strong foundation for launching and customizing a modern Android classified marketplace.