Termux:X11 — Floating Keyboard Button

A contribution-style feature branch on top of the Termux:X11 codebase. Termux:X11 is the X11 server that lets you run full Linux GUI apps from Termux on Android. This branch adds a floating action button that, when tapped, brings up the soft keyboard — useful when the X11 client has no native way to summon it, common with terminal-based apps or minimal WMs. Written in C, building with the Android NDK alongside the existing Termux:X11 toolchain.

Highlights

• Dives into low-level Android + X11 internals
• Builds on the official Termux:X11 codebase, not a fork
• Solves a real UX problem when running Linux GUI apps on phones

Technical architecture

• Hook: a small X11 event listener detects focus changes to input fields.
• Trigger: on focus, post a request to the Android UI layer to surface a floating button.
• Button: a system-level overlay (similar pattern to a chat-head) that, on tap, programmatically invokes the soft input.
• Build: integrated with the existing Termux:X11 NDK build — no new toolchain.