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http://forum.unity3d.com/threads/sprites-disappear-when-animation-runs-in-android-device.383466/ Try this it worked for me.
Thank you Vijin, i have tried almost everything (like sprite resolution lowering, changing compressing types, changing animation frame rate,etc )...
I have the same problem. My sprite sheet animated Player object seems fine in unity pc but when i build and run im my android phone half(lower...