PLEASE DOWNLOAD MY OTHER APP "GPU PIXEL SHADERS OGL DEMO" INSTEAD, THANKS!
Please download the refreshed version of this app called "GPU Pixel Shaders OGL Demo" that you can find scrolling down a little bit, not this one because it DOES NOT work properly in latest android versions and it cannot be updated because of the latest google policy regarding the use of the OpenGL term/mark.
Despite the many 1 stars reviews for not working in many devices for reasons not related to the app itself, thanks to everyone for the comments and I hope the new app works fine in every device.
Thanks!