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- Kiosk mode: scanning AppConfig.KIOSK_BARCODE toggles Android Lock Task mode (persisted). As device owner (KioskAdminReceiver) it is a full lockdown and the app becomes the persistent home screen; otherwise it falls back to screen pinning. "Salir" and Back-to-exit are disabled while kiosk mode is on. - Status strip: app-drawn bar showing only Wi-Fi status and battery percentage; system bars stay hidden. - Renderer crash: onRenderProcessGone replaces the WebView and reloads the last URL; repeated crashes show an error screen instead. - Error screen: per-cause messages (no Wi-Fi with auto-retry on reconnect, server unreachable, 5xx, SSL) and an "Ir al inicio" button; 4xx pages are left to the site. - Mixed content is never allowed. - Admin volume-key hold reduced to 3 seconds. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
97 lines
4.7 KiB
Markdown
97 lines
4.7 KiB
Markdown
# JoykooScanner — Android Barcode Scanner Kiosk App
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## What This Is
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Native Android app (Kotlin) that wraps `https://smart.joykoo.mx/` in a fullscreen WebView for dedicated Chinese industrial handheld barcode scanners. The scanner operates in HID/keyboard-wedge mode — it sends Android key events like a physical keyboard.
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## Critical Design Decision
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The Android soft keyboard must NEVER appear. Keyboard suppression uses multiple layers — do not remove any of them:
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1. `NoSoftKeyboardWebView.onCheckIsTextEditor()` → `false`
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2. `EditorInfo` flags `IME_FLAG_NO_EXTRACT_UI | IME_FLAG_NO_FULLSCREEN` in `onCreateInputConnection()`
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3. `InputMethodManager.hideSoftInputFromWindow()` posted after each InputConnection request and on page load / window focus
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4. JavaScript injection setting `inputmode="none"` on all `<input>`, `<textarea>`, and `contenteditable` elements via `MutationObserver`
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5. Manifest `windowSoftInputMode="stateAlwaysHidden|adjustNothing"`
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The real `InputConnection` from `super.onCreateInputConnection()` **must be returned** — returning `null` breaks hardware key input from the barcode scanner on devices like the Urovo CT58C.
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## Project Structure
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```
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app/src/main/java/mx/joykoo/scanner/
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AppConfig.kt — URL, allowed hosts, admin triggers, scanner broadcasts (single config point)
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MainActivity.kt — Fullscreen kiosk activity, WebView setup, navigation, lifecycle
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NoSoftKeyboardWebView.kt — IME suppression via null InputConnection
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ScannerIntegration.kt — Scanner lifecycle interface
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BroadcastScannerIntegration.kt — Intent-output scans → JS injection (React-safe value setter)
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KioskController.kt — Lock Task kiosk toggle (persisted); device-owner full lockdown + HOME alias, else screen pinning
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KioskAdminReceiver.kt — DeviceAdminReceiver for `dpm set-device-owner`
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StatusStrip.kt — App-drawn status strip (Wi-Fi + battery only); system bars stay hidden
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```
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## Build
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- **Language**: Kotlin, targeting JVM 1.8 bytecode
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- **SDK**: compileSdk 34, minSdk 24, targetSdk 34
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- **Dependencies**: androidx core-ktx, appcompat, webkit, swiperefreshlayout
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- **Gradle**: 8.7 with Kotlin DSL, AGP 8.5.2, Kotlin 1.9.24
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- **Package**: `mx.joykoo.scanner`
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### Build prerequisites (not yet installed on this server)
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1. `sudo dnf install java-17-openjdk-devel` — only the JRE is installed, need javac
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2. Android SDK cmdline-tools — download to `~/Android/Sdk/`, then install:
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- `platform-tools`
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- `platforms;android-34`
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- `build-tools;34.0.0`
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3. Set env vars:
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```
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JAVA_HOME=/usr/lib/jvm/java-17-openjdk-17.0.20.1.1-1.2.el9.x86_64
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ANDROID_HOME=~/Android/Sdk
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```
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4. `./gradlew assembleDebug`
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### Server environment (RHEL 9.8)
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- JRE 17 installed at `/usr/lib/jvm/java-17-openjdk-17.0.20.1.1-1.2.el9.x86_64`
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- 323 GB free on /home, 5.5 GB free on /
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- curl, wget, unzip, zip available
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- No Android SDK present anywhere
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## Configuration
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All configurable values are in `AppConfig.kt`:
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- `HOME_URL` — the webpage to load
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- `ALLOWED_HOSTS` — domains that stay inside the WebView
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- `BACK_PRESS_EXIT_COUNT` / `BACK_PRESS_WINDOW_MS` — back-button exit guard
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- `ADMIN_VOLUME_HOLD_MS` — hold Volume Up + Volume Down this long to open the admin dialog
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- `ADMIN_BARCODE` — scanning this value (Intent mode) opens the admin dialog
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- `KIOSK_BARCODE` — scanning this value (Intent mode) toggles kiosk lockdown
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- `RENDERER_CRASH_LIMIT` / `RENDERER_CRASH_WINDOW_MS` — WebView crash auto-recovery limit
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## Navigation Rules
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- URLs on `joykoo.mx` or `smart.joykoo.mx` (and subdomains) load inside the WebView
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- All other URLs are silently blocked
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- Back button goes back in WebView history; 3 rapid presses exits when no history
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- Admin dialog (exit / toggle soft keyboard): hold both volume keys 3 s, or scan `ADMIN_BARCODE`. Volume keys are consumed and never reach the page. No touch gestures — corner taps leaked through to site UI
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## Kiosk & Errors
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- Kiosk mode (`KioskController`): when on, admin dialog hides "Salir" and Back never exits. Device owner required for real lockdown; the app can't be uninstalled while device owner, so set it only with the release-signed APK.
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- Error overlay: per-cause messages (no Wi-Fi with auto-retry on reconnect, unreachable, 5xx, SSL, repeated renderer crash). 4xx responses are left to the site.
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- Renderer crash (`onRenderProcessGone`): the WebView is replaced and the last URL (tracked via `doUpdateVisitedHistory`) reloaded.
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## Security
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- HTTPS only, no cleartext, mixed content never allowed, no SSL error bypass
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- No JavaScript interfaces exposed
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- No file:// or content:// access
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- Network security config enforces system trust anchors only
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- Domain allowlist in WebViewClient
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## UI Strings
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Spanish (`es`) — this is for a Mexico-based company.
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