I found another repository some time ago which implemments the same dragging effects. Besides, its unfold later-menu effects is much more consistent with original Tumblr effects. You can jump to this repository - here. Several days ago, I installed the tumblr app into my genymotion device, and I was totally shocked by its amazing snake-menu animation which is quite smooth and fluent. Since I cannot clearly describe its visual effects, you’d better install this app and try it yourself. Ok, I am always the one who would like to imitate beautiful things. And I was terribly curious about how its animation is implemented.