Key Mapper

Install on your phone or supported device · Instructions checked 2026-10-22

1. On Android 8.0 or newer, choose the official GitHub FOSS release or provider-linked F-Droid package io.github.sds100.keymapper. GitHub currently supplies keymapper-4.6.2-foss.apk; F-Droid currently suggests 4.6.1-foss, so check the channel and version.
2. Install with Android’s package installer or the F-Droid client, then read the accessibility-service explanation before enabling the service for your own device. It observes key presses so the configured shortcuts can work. Start with ordinary physical-key mappings; advanced triggers may be paid or need extra setup.
3. For the provider’s simple example, create a key map, use Record trigger and press volume down, then choose Long press. In Actions, choose Add action and Toggle flashlight. In Constraints, choose Add constraint and Lockscreen is showing.
4. Save with Done and confirm the status is Running. Try the mapping on the lock screen with the screen on. The documented example does not work with the screen off without experimental support. If a device blocks accessibility settings or a key is unsupported, consult the provider’s troubleshooting instructions rather than assuming all hardware behaves alike.

Documentation review only; no APK executed or device permissions changed. The source policy says key-press recording is temporary and Firebase Analytics was removed in 1.1.5, but its log-data wording is broader; no blanket zero-data-collection guarantee is made. Accessibility observes input and optional network actions or integrations can contact their destinations. This is the FOSS core only, with paid features disclosed.