Android app for peer-to-peer communication and multimedia processing — Bluetooth serial, multi-protocol networking (incl. a KCP LAN messenger), GPU/media pipelines, a parametric 3D human model, AI chat, market quotes with home widgets, a voice-deduction board game, and embedded HTTP / SSH servers. UI layer in Java, heavy lifting in C++ via JNI.
| Category | Technologies |
|---|---|
| Platform | Android API 26+, target / compile 31 |
| Language | Java, C++11 |
| Native | JNI, CMake 3.18.1, NDK 23, OpenGL ES 2.0, OpenSL ES, ARM NEON |
| Network | Bluetooth RFCOMM, TCP, UDP multicast, KCP, LAN messenger (KCP over UDP), HTTP, SSH |
| Market Data | Keyless HTTPS: Tencent, Eastmoney, Sina, Binance, Frankfurter (ECB) |
| Media | AudioRecord/Track, MediaExtractor, YUV↔RGB, PCM↔WAV |
| 3D | Parametric mesh + SDF/SurfaceNets, OBJ/MTL export |
| UI | Material Components, ConstraintLayout, custom views, Day/Night |
| Build | Gradle 7.0.2 (AGP 4.1), JDK 8 / 11 |
app/src/main/
├── java/com/tsymiar/device2device/
│ ├── activity/ # 14: Main (dashboard) / Select / Market / Avatar / Texture /
│ │ # Wave / Graph / Sensor / Bt* / Bugger / MyGit / Thanks
│ ├── service/ # Subscribe, Publish, Http (:8080) & Ssh (:2222) server,
│ │ # FileMsg server, Receiver, Window, SaveData, Toast
│ ├── dialog/ # ChatBox (multi-provider AI), FileMsg, LanMsg, Game (deduction board)
│ ├── game/ # Deduction engine: propositions, voice samples, psych profile
│ ├── widget/ # Market widgets: list + chart + heatmap (+ config activities)
│ ├── market/ # QuoteSource (11 sources), Quote, CapRow, Indicators
│ ├── avatar/ # AnnyModel/Targets/Params, MeshBuilder, HumanMesh, Renderer, PhotoAnalyzer
│ ├── acceleration/ # Sensor & voice modules
│ ├── entity/ event/ # Data entities, observer bus
│ ├── utils/ view/ # Utilities (Atom, SoundRecord, HttpsRequest …), custom views
│ │ # (KLineView, DeductionBoard / DeductionGameScreen …)
│ └── wrapper/ # JNI bridge: callback, network, view, media, time
└── cpp/ # JniMethods, bitmap, callback, codec, convert, display,
# message, socket (kcp submodule), scadup (submodule),
# test, time, utils
Bluetooth — scanning & pairing, bidirectional RFCOMM serial with directional commands, auto logging, draggable floating receive window.
Networking — TCP / UDP multicast / KCP reliable UDP, LAN messenger (KCP-over-UDP text & image chat with UDP-broadcast peer discovery), Pub/Sub floating dialogs, chunked file transfer with progress, HTTP file server (FS + SAF, sortable listing, in-page viewer), SSH server on port 2222.
LAN messenger — LanMsgDialog: one KCP-over-UDP socket bound to 0.0.0.0:<port> is both client and server — no connect handshake, peers are addressed by IP; periodic UDP-broadcast discovery with timeout eviction; oversized images are fragmented and reassembled on the peer; discovery address / port configurable.
Market quotes — MarketActivity + KLineView; keyless feeds from auto (smart pick + fallback), tencent, eastmoney, gold/xau/gc, crude/brent/ng, usd, binance. Code / name / pinyin picker, candles + MA + indicators (MACD, RSI, KDJ), drag-pan, pinch-zoom, crosshair, 15 s refresh.
Market widgets — three home-screen widgets bring quotes to the launcher without opening the app. The quote list (2×2, resizable) shows several watched symbols at once; rows land one by one as responses arrive, so the widget fills in progressively instead of flashing in all at once. The quote chart (2×2, resizable) draws a single symbol's trend as a sparkline, and gold symbols additionally annotate the CNY-per-gram price. The market cap heatmap (4×4) paints a squarified treemap of the top-30 A-shares: tile area encodes market cap, colour encodes the daily change, and a tap opens the full quote page. All three share one repaint path that follows day/night mode, size themselves adaptively to their host, and refresh on the same 15 s cadence as the in-app K-line view; each widget ships a configuration activity for picking symbols and the refresh interval.
Messaging (C++ ↔ Java) — thread-safe queue + MASSAGER enum bridging native events (toast, status, file progress, texture, socket state) to the UI.
Multimedia — EGL/GLES2 and CPU image & video rendering, 16 kHz PCM recording with live waveform, WAV/MP4/OGG/MP3/AAC/AMR playback, built-in STT.
Avatar — fully on-device parametric body. Photo contributes appearance and silhouette; Native engine is SDF + SurfaceNets (procedural), High-res uses Anny (naver/anny, Apache-2.0, MakeHuman/CC0) whose phenotype blendshapes are baked offline into anny.mhb and solved as w = Π c; falls back to Native when missing. Silhouette/color extraction, face shapes, 8 hairstyles, life-size measurements (BMI, girths, inseam), GL preview, OBJ+MTL export.
Rebuild the bundle:
python3 tools/export_anny_targets.py export --anny-dir /path/to/anny --out app/src/main/assets/anny/anny.mhb(--syntheticfor a placeholder,selftestfor byte-exactness).
AI chat — DeepSeek (built-in key fallback), Ollama (local host editable / Cloud), OpenRouter (free models only). Model lists are fetched per provider; selection is remembered.
Deduction board — Voiceprint Deduction: full-screen GameDialog hosting DeductionGameScreen; DeductionEngine builds propositions from voice samples (DeductionAudio) and tracks the three psychological traps — echo reinforcement, negative overwrite, self-learning; adaptive board text fitting.
System — observer event bus, native time sync, global toast, one-tap exit, sensor dashboard with 7.0 m/s² acceleration alert.
Requirements: SDK 31 + Build Tools 30.0.3, NDK 23.0.7599858, CMake 3.18.1, Gradle 7.0.2, JDK 8 / 11.
ABIs: arm64-v8a, armeabi-v7a, x86_64.
git submodule update --init --recursive # app/src/main/cpp/scadup, app/src/main/cpp/socket/kcp
./build.sh # or: ./build.sh release | clean | cleanall
# BUILD_OFFLINE=1 ./build.shbuild.sh writes local.properties from your environment and copies the APKs to dist/.
CI (Azure Pipelines, macos-latest) checks out the repo plus the tsymiar/scadup submodule and builds all three ABIs.
Permissions: BLUETOOTH* (incl. SCAN/CONNECT/ADVERTISE), location (BT scan), INTERNET,
ACCESS_NETWORK_STATE, ACCESS_WIFI_STATE, CHANGE_WIFI_MULTICAST_STATE, storage & media read,
CAMERA, RECORD_AUDIO, VIBRATE, WAKE_LOCK, FOREGROUND_SERVICE,
SYSTEM_ALERT_WINDOW, REQUEST_IGNORE_BATTERY_OPTIMIZATIONS, ACTIVITY_RECOGNITION,
HIGH_SAMPLING_RATE_SENSORS, READ_PHONE_STATE.
MIT
- File transfer: aligned protocol with
LinxSrvc(Mac/Linux) — magic now embedsPROTOCOL_VERSION;FileMsgSocketkept in sync withTransferEngine. - UI: splash/auth animation shortened (~2000 ms → ~800 ms).
- LAN: KCP-over-UDP messenger with UDP-broadcast discovery.
- Game: Voiceprint Deduction board (voice samples, proposition synthesis, 3 psychological traps).
- Market: 4×4 market-cap heatmap widget; progressive quote-list widget; Zijin Mining default K-line.
- ChatBox: multi-provider (DeepSeek / Ollama / OpenRouter) with editable Ollama host.
- Sensors: Catmull-Rom smoothed decibel card.
- System: SSH controls merged into Network; MediaCodec→TextureView; BT on worker thread.
- Avatar: Air Bangs; Anny Bust; Hip Fullness calibration.
- Avatar: Anny engine, face shapes/hairstyles, body measurements, photo fallback.
- Sensors: scalable dashboard, full-screen compass/level, decibel card.
- Market: K-line view (11 sources) + 2×2 quote list widget.
- System: SSH server (2222), HTTP + SAF fixes, dark-mode spinner.
- Messaging:
MSG_HINT, async Pub/Sub, subscription buffer fix, port parsing hardening.