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README.md

Lô tô — Android (Capacitor wrapper)

android-build-debug

Fully-offline Android wrapper around the web/ SvelteKit PWA. All assets — HTML, JS, CSS, and 184 voice MP3s — are bundled into the APK at build time. No network is required at runtime.

Note: the previous native Kotlin/Compose port lives in git history at the commit titled docs: add post-implementation todo list and earlier. This is now a thin wrapper over web/; the web app evolves and we rebuild + ship.

How it works

../web/
  └── pnpm run build →  ../web/build/  (SvelteKit static output)
                                ↓
                         npx cap sync
                                ↓
android/app/src/main/assets/public/  (bundled into APK)
                                ↓
            WebView serves https://localhost/* off-disk

Capacitor's bridge serves the bundled site from https://localhost, which is loopback only (no INTERNET permission requested). Workbox precache, IndexedDB, and the <audio> element all work offline.

Stack

  • Capacitor 8 (Android wrapper)
  • Web app in web/: SvelteKit 2 + Vite 8 + @sveltejs/adapter-static + @vite-pwa/sveltekit
  • minSdk 24 · targetSdk 36 · JDK 21 · Node 22 (Capacitor 8 requires both)

Setup

git clone https://github.com/tiennm99/loto.git
cd loto/android
npm ci
npm run build      # builds web/ + cap sync into android/

Build

Debug APK

npm run build              # build web/ + cap sync (must run after any web/ change)
npm run assemble:debug     # → android/app/build/outputs/apk/debug/app-debug.apk

Release AAB + APK (signed)

export LOTO_KEYSTORE_PATH=$HOME/.android/miti99-apps.p12
export LOTO_KEYSTORE_PASSWORD=<store-password>
export LOTO_KEY_ALIAS=<key-alias>
export LOTO_KEY_PASSWORD=<key-password>

npm run build
npm run assemble:release
# → android/app/build/outputs/{apk/release/*.apk, bundle/release/*.aab}

Open in Android Studio

npx cap open android

Picking up web/ changes

web/ and android/ live in the same repository, so there is no pin to bump — rebuild and re-sync after any change under web/:

npm run build              # rebuild web/ + re-sync into android/

Why no INTERNET permission?

The whole web build (HTML, JS, CSS, fonts, manifest, icons, all 184 MP3s) ships inside the APK. The WebView loads from https://localhost, which is loopback. No remote fetches happen at runtime, so the permission is omitted — this makes "fully offline" a hard guarantee, not a convention.

If you ever add a remote feature (analytics, sync, etc.), add this back to android/app/src/main/AndroidManifest.xml:

<uses-permission android:name="android.permission.INTERNET" />

Running on BlueStacks / NoxPlayer / Android emulators

The APK has no native libraries (lib/ is empty), so it's architecture- independent — same APK installs on x86_64 emulators and ARM phones.

  1. Download the APK from the Actions artifact (debug) or Releases (signed).
  2. Drag-drop the APK onto the BlueStacks window, or use Install APK from the sidebar.
  3. Launch "Lo To" from the BlueStacks home screen.

If the app shows a blank white screen on first launch, open chrome://inspect on the host machine while BlueStacks is running, click Inspect on the WebView, and check the console — the WebView debugging is enabled in debug builds (Capacitor default behavior, no INTERNET permission needed because chrome://inspect uses ADB).

Manifest declares touchscreen, faketouch, screen.portrait, and screen.landscape as optional so the Play Store and emulators don't filter the app out.

CI / CD

Workflows live at the repository root in .github/workflows/.

Workflow Trigger Result
android-build-debug push to main, any PR touching web/ or android/ unsigned debug APK uploaded as artifact
android-release tag v*.*.* signed AAB + APK attached to GH Release

Both install npm deps in android/, build web/, cap sync, then run Gradle inside android/android/.

GitHub Secrets (release only)

Secret Required for Description
KEYSTORE_BASE64 signed build base64 -w0 miti99-apps.p12
KEYSTORE_PASSWORD signed build Keystore password
KEY_ALIAS signed build Key alias
KEY_PASSWORD signed build Key password
PLAY_SERVICE_ACCOUNT_JSON Play Store auto-publish (optional) Full JSON content of Google Cloud service account key

Never commit *.jks, *.keystore, *.p12, service-account JSON, or .env.

Google Play Store

One-time manual setup (cannot be automated)

  1. Sign up at play.google.com/console ($25 one-time)
  2. Create the app entry with package name com.miti99.loto
  3. Build a signed AAB (npm run assemble:release locally, or push a v*.*.* tag to use android-release.yml) and upload manually to the Internal Testing track via the Play Console UI — Google requires the first upload to be manual
  4. Fill out store listing: icon (512×512), feature graphic (1024×500), 2–8 screenshots, short + full description, category, content rating, target audience, privacy policy URL (host on GH Pages), data safety form (declare "No data collected" since the app is offline)
  5. Submit for review (1–7 days first time)

Auto-publish setup (after first manual upload)

  1. Create/select a Google Cloud project and enable the Google Play Android Developer API
  2. In Google Cloud Console, create a Service Account without granting broad Cloud project roles
  3. Keys → Add Key → JSON — download the JSON file
  4. In Play Console → Users and permissions, invite the service-account email and grant app-scoped Release apps to testing tracks + View app information permissions for Lo To
  5. Copy the entire JSON contents into a GitHub repo secret named PLAY_SERVICE_ACCOUNT_JSON
  6. Tag a release (git tag v1.0.1 && git push origin v1.0.1) — android-release.yml will:
    • Build signed AAB + APK
    • Upload to GitHub Release
    • If the secret is set: upload AAB to Play Console Internal track
  7. Promote internal → closed → open → production via the Play Console UI (or change tracks: internal in android-release.yml to automate further)

Important: every release must increment versionCode in android/app/build.gradle before tagging — Play Console rejects duplicate versionCodes.

Tag a release:

git tag v1.0.0
git push origin v1.0.0

Version bump

  1. Edit versionCode and versionName in android/app/build.gradle.
  2. Commit, tag, push.

App ID

com.miti99.loto — set in capacitor.config.json and android/app/build.gradle.

Audio

Bundled by the web app under web/static/audio/{hoai-my,nam-minh}/{1..90,cho,kinh}.mp3, served by the wrapper from https://localhost/audio/.... No audio post-processing on the Android side.

License

Apache-2.0 — see LICENSE at the repository root.

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