What is the best way to render glass/ice materials on Android devices with no ray tracing?
I have seen aplha+blending but even with proper lighting, the results just looked "plastic".
Can we do better?
You need proper reflection and refraction to draw good looking transparent materials.
You basically need environment texture as a source of reflection/refraction. I recommend to render the scene without transparent material to make the environmental source texture. Cube-mapping is usually recommended.
Visit here to see how to implement reflection and refraction.