par Zabelle Motte.
Thanks Elton for your answer !
I finally found an other way to test Moodle Mobile on my desktop, and to make demonstration videos.
In am used to virtualize different OS on my computer.
And I succeeded to virtualize an Android OS with Android-x86 on Virtualbox following this tutorial :
http://www.howtogeek.com/164570/how-to-install-android-in-virtualbox/
I succesfully installed Moodle Mobile on my virtualized android and made tests and videos.
It is a bit complicated and suppose to have a good computer, but it is interresting for me to be able to test other android applications, so, that's a good solution.
For those of you that want to discover Virtualization and Virtualbox, have a look at this video :
Note that Virtualbox exists for any desktop OS : https://www.virtualbox.org/wiki/Downloads
This solution solves my problem but it would be a good idea to adapt or to remove the documentation page that seems not to be up-to-date.
With kisses to other Moodlers,
Zabelle