NetDesk 1.5.0 — source release
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# Building NetDesk for Android
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NetDesk's Android app is a Flutter UI (`ui/`) bound, through
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[flutter_rust_bridge](https://cjycode.com/flutter_rust_bridge/) (FRB v2), to a
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compiled Rust library. The Rust FFI layer is the **`netdesk-frb`** crate
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(`frb/`), a `cdylib` that statically links **`netdesk-core`** (signaling, E2E
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crypto, transport, H.264 decode). On Android the library ships inside the
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APK/AAB as `lib/<abi>/libnetdesk_frb.so` and the Dart side `dlopen`s it (the FRB
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loader looks for the stem `netdesk_frb`).
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```
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netdesk-frb (+ netdesk-core) --cargo-ndk--> ui/android/app/src/main/jniLibs/<abi>/libnetdesk_frb.so
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Flutter (ui/) --gradle-----> release .apk / split .apk / .aab (signed)
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```
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---
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## The one command
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From the repo root (`netdesk-native/`), in a shell whose `PATH` contains the
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MinGW tools, cargo, and Flutter:
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```powershell
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powershell -ExecutionPolicy Bypass -File packaging\build-android.ps1
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```
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That single command:
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1. verifies / auto-provisions the toolchain (cargo-ndk, the rustup Android
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targets),
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2. detects the Android NDK at `C:\dev\android-ndk`,
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3. compiles `netdesk-frb` for **arm64-v8a, armeabi-v7a, x86_64** with cargo-ndk
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and drops `libnetdesk_frb.so` straight into
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`ui/android/app/src/main/jniLibs/<abi>/`,
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4. builds the release **fat APK**, the **per-ABI split APKs**, and the Play
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**App Bundle (.aab)**.
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Useful switches:
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| Switch | Effect |
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| --- | --- |
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| `-Target apk\|split\|aab\|rust\|all` | Build only that deliverable (default `all`; `rust` = just the `.so`). |
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| `-SkipRust` | Reuse the `.so` already in `jniLibs`, build Flutter only. |
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| `-Abis arm64-v8a` | Restrict the ABIs (default all three). |
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| `-GenerateKeystore` | Create the release keystore + `key.properties` first (see below). |
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| `-MinSdk 21` | Android API the `.so` links against (must be `<=` Flutter `minSdk`). |
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| `-NdkHome <path>` | Override the NDK location (default `C:\dev\android-ndk`). |
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---
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## Toolchain
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| Component | Version / location used here |
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| --- | --- |
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| Rust | stable (cargo 1.99) on `PATH` |
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| rustup targets | `aarch64-linux-android`, `armv7-linux-androideabi`, `x86_64-linux-android` |
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| cargo-ndk | 4.1.2 (`cargo install cargo-ndk`) |
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| Android NDK | r26d (`26.3.11579264`) at `C:\dev\android-ndk` (`ANDROID_NDK_HOME`) |
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| Android SDK | `%LOCALAPPDATA%\Android\Sdk` |
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| Flutter | `C:\dev\flutter\bin\flutter.bat` |
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| JDK (keytool + Gradle) | Android Studio JBR (auto-detected) |
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| nasm | on `PATH` (needed by `openh264` for the x86_64 ABI) |
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One-time setup (the build script also does the first three automatically):
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```powershell
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rustup target add aarch64-linux-android armv7-linux-androideabi x86_64-linux-android
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cargo install cargo-ndk
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# NDK: unzip the Android NDK r26+ to C:\dev\android-ndk (set ANDROID_NDK_HOME)
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```
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Recommended `PATH` (Git Bash form):
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```bash
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export PATH="/c/mingw-netdesk/mingw64/bin:$HOME/.cargo/bin:/c/dev/flutter/bin:$PATH"
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```
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### What cargo-ndk runs
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The Rust step is exactly:
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```
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cargo ndk -t arm64-v8a -t armeabi-v7a -t x86_64 \
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-o ui/android/app/src/main/jniLibs --platform 21 \
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build --release --package netdesk-frb --lib
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```
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cargo-ndk sets the per-ABI clang/linker from the NDK, and the `-o` flag copies
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each produced `libnetdesk_frb.so` into `jniLibs/<abi>/`. The `.so` are build
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artifacts (git-ignored) and are regenerated on every run.
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---
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## Release signing
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Signing credentials live in `ui/android/key.properties`, which is **git-ignored**
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(so are `*.keystore` / `*.jks`). A committable template is
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`ui/android/key.properties.example`.
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`app/build.gradle.kts` loads `key.properties` when present and signs the release
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build with it; when it is absent the release build falls back to **debug**
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signing so `flutter run --release` still works during development.
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Create the upload keystore once (the password is read from the environment and
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is **never** written into a committed file):
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```powershell
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$env:NETDESK_KEYSTORE_PASSWORD = '<your-strong-password>'
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powershell -ExecutionPolicy Bypass -File packaging\build-android.ps1 -GenerateKeystore
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```
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This writes:
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* `ui/android/app/netdesk-release.keystore` - RSA 4096, alias `netdesk`, 10000-day validity,
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* `ui/android/key.properties` - with the alias, store file, and the password you
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supplied (local only; keep it out of version control).
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> Back up the keystore and remember the password. If you lose either you can no
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> longer push updates to an app already published under that key (unless it uses
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> Play App Signing with a separate upload key you can reset).
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---
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## Outputs
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After a full build:
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| Deliverable | Path (under `ui/`) |
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| --- | --- |
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| Fat APK (all ABIs) | `build/app/outputs/flutter-apk/app-release.apk` |
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| Split APKs (per ABI) | `build/app/outputs/flutter-apk/app-arm64-v8a-release.apk`, `-armeabi-v7a-`, `-x86_64-` |
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| Play App Bundle | `build/app/outputs/bundle/release/app-release.aab` |
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The fat APK is convenient for side-loading / direct download; the split APKs are
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smaller per device; the `.aab` is what Google Play requires.
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---
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## Publishing to Google Play (AAB)
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1. Produce the signed bundle:
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```powershell
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powershell -ExecutionPolicy Bypass -File packaging\build-android.ps1 -Target aab
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```
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(or run the default `all` target). The bundle is
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`ui/build/app/outputs/bundle/release/app-release.aab`.
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2. In the [Play Console](https://play.google.com/console), create the app, then
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upload the `.aab` under a release track (internal testing first).
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3. Enrol in **Play App Signing** (recommended). Google then holds the *app
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signing key*; the keystore above becomes your *upload key*. If the upload key
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is ever compromised you can ask Google to reset it - which is why App Signing
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is preferred over shipping the raw signing key.
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4. `versionCode` / `versionName` come from `ui/pubspec.yaml`
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(`version: x.y.z+build`). Bump the `+build` number for every Play upload - the
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Console rejects a duplicate `versionCode`.
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---
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## Troubleshooting
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* **"Android NDK not found"** - the script could not find a complete NDK at
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`C:\dev\android-ndk` (it checks for `source.properties` +
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`toolchains\llvm\prebuilt`). Finish extracting the NDK, set `ANDROID_NDK_HOME`,
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or pass `-NdkHome <path>`. Use `-SkipRust` to build only the Flutter layer
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against an already-built `.so`.
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* **x86_64 ABI fails in `openh264`** - that ABI needs `nasm` on `PATH`. arm64-v8a
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and armeabi-v7a do not. Drop x86_64 with `-Abis arm64-v8a,armeabi-v7a` if you
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only ship to real devices.
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* **Gradle wants to download an NDK** - `app/build.gradle.kts` points AGP at
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`ANDROID_NDK_HOME` when it is set, so the prebuilt (already stripped) `.so` are
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packaged without a second NDK download. Make sure the env var is set (the build
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script sets it).
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* **`UnsatisfiedLinkError: libnetdesk_frb.so`** at runtime - the `.so` for the
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device's ABI is missing from `jniLibs`. Re-run the Rust step (`-Target rust`)
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for that ABI, or confirm the FRB loader stem is still `netdesk_frb`.
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