DropLine Server – Wi-Fi FTP & HTTP File Server (Flutter Android App)

DropLine Server turns any Android device into a high-speed local Wi-Fi file server. Transfer files between Android phones, Windows PCs, macOS, Linux, and iOS devices using standard web browsers (HTTP) or dedicated FTP clients — with zero USB cables and $0 cloud hosting fees.

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At a Glance:
• $0 / Month Server Cost: 100% peer-to-peer on local Wi-Fi. Zero cloud bills.
• Dual Protocol Engine: Simultaneous FTP Server (port 2121) and HTTP Web Server (port 8080).
• Google AdMob Monetization: Production-ready Banner and Interstitial ad placements.
• Instant QR Code Sharing: One-tap camera scanning for instant browser connection.
• Android 14+ Ready: Native Kotlin foreground service (dataSync) prevents transfer termination.
• 15-Minute Reskin: Clean GetX architecture with centralized configuration.

Overview

DropLine is an end-to-end commercial Flutter and Android template crafted for mobile developers, agencies, and entrepreneurs. Built on clean GetX state architecture and embedded native Kotlin server engines, the app operates 100% locally over Wi-Fi, meaning zero ongoing hosting or cloud database fees. It includes built-in Google AdMob monetization and scannable QR code sharing, allowing you to rebrand, configure, and publish directly to the Google Play Store.

Key Features

• Dual FTP and HTTP Server Engine: Runs an RFC 959 compliant Apache FTP server on port 2121 and an embedded NanoHTTPD web server on port 8080 simultaneously.
• Web Browser File Manager: Any device on the same local network can access, browse, upload, and download files using standard web browsers (Google Chrome, Safari, Microsoft Edge, Mozilla Firefox) without installing external apps.
• Google AdMob Monetization: Complete, policy-compliant integration of Google AdMob Banner and Interstitial advertisements with smart cooldown intervals and frequency caps.
• Instant QR Code Sharing: One-tap QR code popup allows clients on the same Wi-Fi network to scan with their mobile camera and connect instantly without typing IP addresses.
• Native Android Share Sheet: Share server connection URLs directly via WhatsApp, Telegram, email, messaging, or any installed communication app.
• Android 14 Foreground Service: Utilizes an official Android foreground service (dataSync) with persistent status notification to ensure uninterrupted transfers when the screen is locked or the app is minimized.
• Configurable Credentials and Ports: Easily adjust FTP and HTTP port numbers, custom username and password authentication, or enable anonymous read-only access from the Settings screen.
• Transfer History and Statistics: Real-time session monitoring displaying client IP addresses, transferred byte sizes, timestamps, and upload/download filter tabs.
• Hardware Keystore Security: User credentials and authentication settings are cryptographically stored in Android Keystore for enterprise-level protection.
• Zero-Configuration mDNS Hostname: Automatic local domain resolution allowing devices to connect via friendly hostname (http://dropline.local:8080) instead of raw IP numbers.
• Wi-Fi Connection Guard: Automatically checks connection status and prompts the user to join a Wi-Fi network before starting server operations.
• Modern Dark Mode UI: Elegant, high-contrast dark theme designed to maximize session duration and Google Play Store ratings.

Google AdMob Monetization System

DropLine comes equipped with an out-of-the-box monetization framework designed to generate passive revenue without compromising user experience:

Ad Placements & Policy Compliance:
• Adaptive Banner Ads: Docked cleanly at the bottom of the home screen, styled seamlessly with the dark UI palette.
• Smart Interstitial Ads: Triggered only after the server is stopped — never interrupting an active file transfer.
• Frequency Capping & Cooldown Protection: Built-in cooldown timers prevent rapid ad displays and protect your AdMob account standing.
• Single-File Configuration: Simply paste your production AdMob Banner and Interstitial Ad Unit IDs into lib/app/config/app_config.dart and set useTestAds = false.

QR Code & One-Tap Link Sharing

Typing local IP addresses and ports manually is slow and error-prone. DropLine solves this with integrated sharing capabilities:

• Scannable QR Code Dialog: Tapping the QR icon presents a clear QR code encoding the local HTTP server URL. Any smartphone camera can scan it to launch the web file browser immediately.
• Instant URL Sharing: Tap the Share button to invoke Android’s native sharing sheet and send the exact FTP and HTTP links to colleagues or other devices.
• Dynamic Refresh: The QR code and share URLs automatically adapt whenever network settings, IP addresses, or custom ports are modified.

Technical Specifications

Required Android Permissions

DropLine requests only the standard permissions required to broadcast local network servers and access device files:

• Network State: INTERNET, ACCESS_NETWORK_STATE, ACCESS_WIFI_STATE, CHANGE_WIFI_MULTICAST_STATE
• Foreground Service: FOREGROUND_SERVICE, FOREGROUND_SERVICE_DATA_SYNC, POST_NOTIFICATIONS
• File & Media Access: READ_EXTERNAL_STORAGE, WRITE_EXTERNAL_STORAGE, READ_MEDIA_IMAGES, READ_MEDIA_VIDEO, READ_MEDIA_AUDIO, MANAGE_EXTERNAL_STORAGE

What You Get Upon Purchase

Package Deliverables Checklist:
[x] Full Flutter 3.x source code (clean, sound null-safe Dart)
[x] Native Kotlin foreground service and server implementation
[x] Complete Google AdMob setup (Banner and Interstitial ads with test toggle)
[x] Comprehensive documentation in HTML format (setup, reskinning, AdMob, build steps)
[x] Free future product updates
[x] 6 months of dedicated author support via CodeCanyon

Requirements

• Flutter SDK 3.x (Stable)
• Android Studio (latest) or VS Code
• JDK 17 and Android SDK Platform 34

Support

Support is provided via CodeCanyon according to Envato Item Support policy. Please open a ticket through our author profile with your purchase code for prompt technical assistance.