tmux Android

Android API client for tmux-ui / tmux-browser.

The server project is expected to already be running on port 3000. This app does not host or load the existing web UI. It calls the existing HTTP and WebSocket APIs directly:

• server URL management for Tailscale 100.x.y.z:3000 APIs
• quick server selectors for 100.89.0.2, 100.89.0.4, 100.89.0.9, 100.89.0.11, and 100.89.0.116
• one-tap probe for the preset Tailscale APIs, showing health/version and session counts
• native tmux session list
• create, rename, send command, split pane, select pane, kill pane, pin, mute, and kill session through HTTP API
• open one live terminal viewer through /ws/terminal
• native /ws/events listener for session invalidation and hook notifications
• GitHub and Gitea update manifest mirrors with fallback
• native API action center for health, server status, timeline, preferences, kanban projects, group messages, hook events, image file/URL upload, image preview info, and native image preview display
• mobile soft-key row for tmux-oriented input, including tmux prefix, detach, new window, previous/next window, Ctrl keys, arrows, page keys, and paste
• automatic update checks against a GitHub Release manifest
• APK download, SHA-256 verification, and installer handoff

Server URL

Default:

http://100.89.0.116:3000

On a physical Android device, 127.0.0.1 means the phone itself. The app therefore defaults to Tailscale and includes quick selectors for:

http://100.89.0.2:3000
http://100.89.0.4:3000
http://100.89.0.9:3000
http://100.89.0.11:3000
http://100.89.0.116:3000

The upstream server should stay bound to localhost or a private Tailscale IP. Do not expose terminal control on 0.0.0.0 to the public internet.

GitHub Actions Build

The workflow in .github/workflows/android.yml builds APKs online.

Required environment on Actions:

• ubuntu-latest
• JDK 17
• Android SDK platform 35 installed by android-actions/setup-android
• Gradle 8.10.2 installed by gradle/actions/setup-gradle
• Android Gradle Plugin 8.7.3 from Google Maven

For release builds that can update an already installed app, configure these repository secrets:

ANDROID_KEYSTORE_BASE64
ANDROID_KEYSTORE_PASSWORD
ANDROID_KEY_ALIAS
ANDROID_KEY_PASSWORD

Create the base64 value from your release keystore:

base64 -w 0 tmux-android-release.jks

Publish a test build by pushing a v* tag. That creates a GitHub Release with:

https://github.com/neatstudio/tmux-browser-android/releases/latest/download/tmux-android.apk
https://github.com/neatstudio/tmux-browser-android/releases/latest/download/latest.json

Those GitHub links are the primary public install/update channel. Gitea releases are mirrored as a second public source. This Gitea instance does not support the GitHub-style /releases/latest/download/... URL, so the app uses the Gitea Release API as the stable Gitea update entrypoint.

Plain branch builds only create Actions artifacts; they are useful for CI verification, but releases are the stable download/update channel.

Unsigned/debug workflow artifacts are useful only for smoke testing install and launch. Automatic in-place updates require release APKs signed with the same keystore every time; otherwise Android treats the APK as a different or incompatible package.

Current Terminal Scope

The terminal screen connects to /ws/terminal and sends the upstream protocol messages unchanged: attach, input, resize, scroll, and clear-history. The first Android UI renders terminal output as monospace text with basic ANSI SGR color support. The terminal view stays bottom-aligned when output is short, auto-scrolls as data arrives, and adjusts its bottom inset when the soft keyboard opens. It is enough for shell-oriented remote testing, but it is not yet a complete xterm-compatible renderer for full-screen TUIs such as vim or top.

The terminal toolbar and shortcut row include tmux prefix helpers. The app sends the same control bytes a keyboard would send, for example Ctrl+B, Ctrl+B d, Ctrl+B c, Ctrl+B n, and Ctrl+B p.

All app features are native Android controls. Complex server objects such as kanban projects, preferences, timeline events, group messages, and image metadata currently use native forms plus native JSON detail dialogs; image preview uses a native ImageView. The app does not load the browser UI.

Permissions

The app needs network access and package install handoff for updates. Android does not ask at runtime for normal internet access. Android 8+ requires the user to allow this app to install unknown apps before automatic update installation can continue. Android 13+ may ask for notification permission.

SMS permission is intentionally not requested because tmux-browser-android does not read or send SMS.

Auto Update

Normal Android apps cannot silently replace themselves. This app checks the release manifest automatically, downloads the newer APK, verifies its SHA-256, then opens Android's package installer. The user still has to approve the install, and Android 8+ may require allowing this app to install unknown apps.

The default update manifest is:

https://github.com/neatstudio/tmux-browser-android/releases/latest/download/latest.json

The public manual APK download is:

https://github.com/neatstudio/tmux-browser-android/releases/latest/download/tmux-android.apk

The app tries the selected update source first, then falls back to the GitHub manifest and the Gitea release API. The Gitea API endpoint is:

https://gitea.neatcn.com/api/v1/repos/tmux/tmux-browser-android/releases/latest

Gitea tag-specific assets are also public, for example:

https://gitea.neatcn.com/tmux/tmux-browser-android/releases/download/v0.1.7/latest.json
https://gitea.neatcn.com/tmux/tmux-browser-android/releases/download/v0.1.7/tmux-android.apk

In the app:

• Tap Update on the main screen to check latest.json, download the APK, verify SHA-256, and open Android's installer.
• Open More -> Open APK download to download the current public APK in a browser.
• Open More -> Permissions / update status to see the installed version, update manifest, APK URL, install permission state, and a Check update button.