Termux isn't required, unless you want other applications (e.g. git, python, or GCC).
If you do want Termux, a signed and compatible version is provided by the Emacs devs. It should all be in the README (at least it always has been, through various updates, since I started using the Emacs on Android before it was merged into the main branch).
If you do want Termux, a signed and compatible version is provided by the Emacs devs. It should all be in the README (at least it always has been, through various updates, since I started using the Emacs on Android before it was merged into the main branch).