Скачать или смотреть Using FLTK (C++) on Android

This video shows a basic setup for using FLTK on Android.
The implementation is still being worked on by the FLTK developers, so it's still a work in progress, and the support isn't official yet.

The basic steps:
Create a new android C++ project.
Delete MainActivity.java.
Modify AndroidManifest.xml and tell it it's a NativeActivity, add lib_name to point to your lib name.
git clone the fltk repo into a subdirectory from the CMakeLists.txt file.
Delete VERSION file from the FLTK repo, it messes with clang!
Modify the CMakeLists.txt file to add_subdirectory(fltk)
Modify build.gradle CMake arguments to turn off building FLTK test and examples.
Create a C++ main function, build and run.