PHASE 22.2: Mobile Client - Native Android Application

🎯 Objective

Implement a native Android application with complete streaming, rendering, input, and networking capabilities using modern Android architecture and best practices.

📋 Subtasks Overview

22.2.1: Android Project Setup and Base Architecture

• Create Android project with Gradle configuration
• Setup Kotlin and Jetpack Compose dependencies
• Configure build variants (debug/release) with signing configs
• Setup ProGuard/R8 obfuscation rules
• Create base architectural components (ViewModel, Repository, UseCase patterns)
• Configure AndroidManifest.xml with required permissions (INTERNET, CAMERA, etc.)
• Setup Hilt dependency injection framework
• Create base data classes and models

22.2.2: Android Jetpack Compose UI Layer - Main Screens and Navigation

• Create main navigation graph with Compose NavHost
• Implement LoginScreen with Material Design 3 authentication UI
• Build PeerDiscoveryScreen with LazyColumn peer list and selection
• Create StreamScreen container with proper state management
• Implement SettingsScreen with scrollable configuration options
• Add StatusOverlay component for FPS/latency display
• Create ControlPanel layout with action buttons
• Implement proper Material Design 3 theming

22.2.3: Android Vulkan Rendering Engine (Primary)

• Create VulkanRenderer with native Vulkan API bindings
• Implement Vulkan instance, device, and queue creation
• Setup render pass, framebuffer, and graphics pipeline
• Create command buffer recording and synchronization
• Implement vertex/fragment shader compilation and pipeline layout
• Add frame rendering loop with proper synchronization primitives
• Implement FPS monitoring and frame timing metrics
• Create JNI bridge for native C++ Vulkan code
• Setup Android Surface integration with Vulkan

22.2.4: Android OpenGL ES Rendering (Fallback)

• Implement OpenGLRenderer for older devices (API 21+)
• Setup OpenGL ES 3.0+ context and capabilities detection
• Create shader programs (vertex/fragment) and program linking
• Implement texture management and VAO/VBO handling
• Create frame rendering pipeline with proper state management
• Add feature detection and capability querying
• Implement automatic fallback mechanism from Vulkan to OpenGL
• Setup proper error handling for GL operations

22.2.5: Android Hardware Video Decoding (H.264/VP9/AV1)

• Implement VideoDecoder using MediaCodec API
• Support H.264, VP9, and AV1 codec formats
• Setup SurfaceTexture for hardware decoded output
• Implement frame buffer management and synchronization
• Create codec capability detection and selection
• Add frame timing and synchronization with audio
• Implement proper error handling for codec failures
• Create fallback to software decoding if hardware unavailable

22.2.6: Android Audio Engine and Opus Decoding

• Setup AAudio (primary) and OpenSL ES (fallback) audio engines
• Implement OpusDecoder for Opus audio format
• Configure low-latency audio output buffer sizes
• Implement audio session routing and focus management
• Add volume control and audio ducking support
• Create audio buffer management with proper synchronization
• Implement audio format conversion utilities
• Setup proper audio thread management and priorities

22.2.7: Android Input Controls - On-Screen Joystick and Buttons

• Implement OnScreenJoystick Composable with drag detection
• Create action buttons (A, B, X, Y) layout with proper sizing
• Add D-Pad support with multi-touch gesture handling
• Implement haptic feedback via VibratorManager
• Create touch gesture handlers (pinch, rotate, swipe)
• Add keyboard mapping for touch controls
• Implement control visibility and auto-hide with timers
• Create gesture customization and sensitivity settings

22.2.8: Android Sensor Fusion and Gamepad Support

• Implement SensorManager integration for device sensors
• Add gyroscope and accelerometer data collection
• Create sensor fusion algorithm (Madgwick or Kalman filter)
• Integrate GameController API for external gamepads
• Support Xbox, PlayStation, and generic gamepad input
• Add motion data normalization and filtering
• Implement button mapping and trigger sensitivity configuration
• Create gamepad detection and connection handling

22.2.9: Android Network Stack - Streaming Client and Connection

• Implement StreamingClient with Kotlin coroutines and Flow
• Setup TLS/SSL with Network Security Configuration
• Create packet serialization/deserialization with Protocol Buffers
• Implement receive/send loops with Socket management
• Add connection error handling and automatic retry logic
• Implement bandwidth monitoring and statistics collection
• Create proper lifecycle management for connections
• Setup socket buffer tuning for optimal performance

22.2.10: Android Peer Discovery - mDNS Integration

• Implement mDNS discovery with NsdManager (Network Service Discovery)
• Create Peer model for discover...