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# MeshBay — Android client
A client, not a host: no node runs on a phone (`docs/MESHBAY_DESIGN.md` §11.3).
The shell is a system WebView showing the interface **from the package** —
`meshbay-hub/src/meshbay_hub/static/` copied at build time into
`build/generated/`, never committed (§8.3) — with a bridge
(`app/src/main/assets/bridge/meshbay-bridge.js`) that offers the page the same
`window.meshbay` as the desktop preload, wherever it offers anything at all.
Hub calls leave from native code, to the signed-in hub only. The device key,
the bundle key and every node identity are held natively under an Android
Keystore key; the page is told public keys and handed signatures, asked for by
kind — never bytes. `meshbay-hub/tests/vectors/keyring.json` holds that keyring
to the desktop's and to the specification.
Downloads are written to disk as they arrive — into the folder chosen in
Settings (a Storage Access Framework tree, as `<name>.part` until complete) or
the system Downloads collection (a pending entry until complete) — and the
page holds an opaque id, never a URI. Uploads come through the system picker.
Casting: the page pushes the decrypted stream to a local HTTP relay (a port of
the desktop's `cast-relay.js`, bound to the Wi-Fi address only); receivers are
found and driven through the platform cast SDK with the default media receiver.
While a cast runs, a media-playback foreground service holds the CPU and the
Wi-Fi, and the WebView is kept reported visible — without that, Chromium
freezes the page 60 s after the screen goes off. Where play services are
absent, the page is offered no cast at all.
```bash
# needs JDK 17+ and an Android SDK (ANDROID_HOME, or sdk.dir in local.properties)
./gradlew assembleDebug # app/build/outputs/apk/debug/app-debug.apk
./gradlew testDebugUnitTest # JVM unit tests
```
The security contract is also pinned from the Python suite by reading this
source: `packages/meshbay-hub/tests/test_android_shell.py`.
Not built yet: phone-specific behaviour (back button, network handover,
keeping a download alive with the screen off), signed releases.
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