mc-webui/android/README.md

Android companion app — source

The app users install is a thin WebView wrapper around their own mc-webui instance: one screen for the server address, one full-screen WebView for the interface itself. It contains no mesh logic and talks to nothing except the server the user typed in.

The sources are here so that anyone installing the .apk can see what they are installing, and build it themselves if they prefer. For install instructions, see Android App.

Published build	mc-webui-wrapper.apk
Package	it.wojtaszek.mc.wrapper
Min / target SDK	21 (Android 5.0) / 34
Permissions	INTERNET; CAMERA for QR scanning; WRITE_EXTERNAL_STORAGE (Android 9 and older) for saving downloads

Layout

src/
├── settings.gradle.kts, build.gradle.kts, gradle.properties
├── gradle/wrapper/gradle-wrapper.properties
└── app/
    ├── build.gradle.kts
    └── src/main/
        ├── AndroidManifest.xml
        ├── java/it/wojtaszek/mc/wrapper/MainActivity.kt   ← the whole app
        └── res/                                            layout, strings, icons

MainActivity.kt is the entire application. Worth knowing about it:

• The server address is stored in SharedPreferences and only ever replaced by the user. A failed connection or a Back press shows the address form pre-filled — it never wipes what was saved
• Back on the first mc-webui page asks: exit, change server, or cancel
• Links to other hosts (URLs in messages, the packet analyzer) and non-http schemes are handed to the system, so the app stays on the user's instance
• The page's camera request (QR scanning) is mirrored to an Android permission request; downloads go to the phone's Downloads folder via DownloadManager

Building

Open src/ in Android Studio (the Gradle wrapper JAR is not checked in — Android Studio supplies it) and let it sync. Then:

• Debug build: Build → Build Bundle(s) / APK(s) → Build APK(s) → app/build/outputs/apk/debug/app-debug.apk. Fine for trying things out on your own phone, not for publishing — it is signed with the throwaway debug key and is marked debuggable
• Release build: Build → Generate Signed App Bundle or APK → APK, pick the project keystore, choose the release variant, and let it build. The result is what ships

Signing

Android identifies an app by its package name and its signing key. An update only installs over an existing app when both match, so a release signed with a different key forces every user to uninstall first — losing their saved server address. In practice this means:

• Use the same keystore for every release, from the first published one
• Back it up (and its passwords) somewhere that survives a reinstalled laptop. There is no way to recover or reissue it
• Never commit the keystore or its passwords to this repository

Publishing a new build

1. Bump versionCode (and usually versionName) in src/app/build.gradle.kts
2. Build the signed release APK
3. Copy it here as mc-webui-wrapper.apk
4. Update the version, size and SHA-256 in docs/android-app.md — sha256sum on Linux, Get-FileHash in PowerShell
5. Mention the change in docs/whatsnew.md