al_android_set_apk_fs_interface man page
al_android_set_apk_fs_interface — Allegro 5 API
#include <allegro5/allegro_android.h> void al_android_set_apk_fs_interface(void)
This function will set up a custom ALLEGRO_FS_INTERFACE(3) which allows working within the APK filesystem. The filesystem root is your assets directory and there is read-only access to all files within.
Note: Some things like querying file size or attributes are not supported by this. You can always use the PhysFS addon to open the APK file (it is just a regular .zip file) and get more complete information.