Local Transfer

Next-Generation Secure Local File Sharing with Liquid Glass Aesthetics & 120Hz Fluidity

Developed & Maintained by Arafath

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📱 Application Screenshots & UI Showcase

Receive Hub & Liquid Glass Link Live P2P beacon with Liquid Glass "Receive via link" button	Selection & Liquid Glass Grid Refractive glass action tiles (File, Media, Paste, Text, Folder, App)	Settings & Liquid Glass Dock Customization options & floating Liquid Glass navigation dock
Browser Share Portal Encrypted local HTTP server & QR sharing portal	Transfer History Clean audit trail of past file transfers	App Updates Integrated update manager with channel switching

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🌟 Overview

Local Transfer is a high-performance, cross-platform file sharing and messaging application that enables instant, secure data transfer across nearby devices on your local network—with zero internet connection, zero third-party cloud servers, and zero speed throttling.

Built on a hybrid architecture combining a high-speed Rust protocol core with a fluid Flutter UI, Local Transfer features a cutting-edge Liquid Glass optical refraction design system and dedicated 120Hz high-refresh-rate display optimizations for unprecedented visual elegance and responsiveness.

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✨ Key Features & Enhancements

💎 Liquid Glass Optical Physics System

• Snell's Law Light Refraction ($n = 1.50$): High-fidelity glass simulation that dynamically bends and distorts underlying interface layers according to authentic crown-glass optical formulas.
• Physical Specular Meniscus Bevel: Realistic directional light highlights (135° angle, 0.75 base intensity, 11dp optical thickness) creating depth and organic glass curvature.
• Integrated AGSL & Java Engine: Android 13+ (API 33+) native RuntimeShader integration paired with custom Flutter shader fallback pipelines.
• Transformed UI Elements:
  • Floating Liquid Glass Navigation Dock: Sleek bottom dock with fluid spring-animated active indicator pill for switching between Receive, Send, and Settings.
  • Quick Action Grid: Glass-morphic action tiles for File, Media, Paste, Text, Folder, and App.
  • Interactive Action Buttons: Tactile fluid press states with haptic micro-feedback on Add, Receive via link, Fix automatically, and Open Firewall.

⚡ 120Hz High-Refresh-Rate Performance

• Proactive Display Negotiation: Auto-detects and engages high refresh rates (FlutterDisplayMode.setHighRefreshRate()) at app startup.
• Fluid Spring Physics: Micro-tuned cubic Bezier and spring curves (120ms–250ms response windows) eliminate micro-stutter and frame drops during navigation and touch interactions.
• Decoupled Background Networking: All heavy cryptography, chunk streaming, and socket operations run on independent background isolates and native Rust threads, keeping the UI thread pinned to 120 FPS.

🔒 Enterprise-Grade Local Security & Privacy

• End-to-End TLS Encryption: Every session generates on-the-fly X.509 certificates with mandatory mutual client certificate verification (SHA-256 fingerprint matching).
• 100% Local Communication: Transfers occur directly peer-to-peer via local Wi-Fi or hotspot. No telemetry, no external server tracking, and no cloud middlemen.
• PIN Authentication: Optional receiving and browser PIN security for restricted environments.

🚀 High-Speed Multi-Threaded Transfer

• Rust Protocol Engine: Leverages asynchronous Rust (tokio, hyper, ring) for maximum network throughput and minimal CPU overhead.
• Multi-Device Discovery: Zero-configuration UDP multicast discovery (v2.2 protocol) instantly detects active peers on both IPv4 and IPv6 link-local subnets.
• Receive via Link (Web Share): Built-in local HTTP server allowing any device with a web browser (Smart TVs, legacy OS, iOS/Android devices without the app) to download files directly.
• Favorite Devices & History: Save trusted devices for one-tap sharing and review detailed transfer receipts.

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🏗️ Architecture

Local Transfer uses a modern multi-layer architecture separating business logic, protocol execution, and visual rendering:

┌────────────────────────────────────────────────────────┐
│                   Flutter UI (App)                     │
│    Refena State Management • Liquid Glass Design       │
│    120Hz Animation Controllers • Slang i18n            │
└───────────────────────────┬────────────────────────────┘
                            │ Method Channels / FRB
┌───────────────────────────▼────────────────────────────┐
│              localsend_isolates Package                │
│    Dart Background Isolates • flutter_rust_bridge      │
└───────────────────────────┬────────────────────────────┘
                            │ Native FFI
┌───────────────────────────▼────────────────────────────┐
│                    Rust Core Engine                    │
│    HTTP/HTTPS Protocol v2 • UDP Multicast v2.2         │
│    Streaming Crypto • Web Share Server                 │
└────────────────────────────────────────────────────────┘

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📥 Download & Installation

The compiled release APK is ready for installation:

• Download Release: Local Transfer v1.0.0 (GitHub Releases)
• Local Path: C:\Users\Fahad\Downloads\Generated APK\Local\LocalTransfer.apk
• Package ID: org.localsend.localsend_app
• Architecture: arm64-v8a
• Target SDK: Android 36 / 37
• Min SDK: Android 24 (Nougat)

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🛠️ Building from Source

Prerequisites

• Flutter: 3.47.x (or pinned via .fvmrc)
• JDK: OpenJDK 17 (JAVA_HOME)
• Android SDK: API 34+ with NDK 28.2.13676358
• Rust: Stable toolchain (x86_64-pc-windows-gnu / MSVC with target triple aarch64-linux-android)

Build Steps

# 1. Clone repository
git clone https://github.com/smartworldarafath/Local-Transfer.git
cd Local-Transfer

# 2. Get dependencies
flutter pub get

# 3. Build release APK
cd app
flutter build apk --target-platform android-arm64 --release --android-skip-build-dependency-validation

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👨‍💻 Developer & Credits

• Developer: Arafath
• Liquid Glass Physics: Based on Snell's Law Optical Refraction & AGSL Runtime Shader implementations.

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📄 License

This project is licensed under the MIT License.