Android - Expandable TextView with Animation

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http://stackoverflow.com – I have a TextView which firstly shows a small portion of a long text. The user can press a "see more" button to expand the TextView and see the rest of that text. Making tests, I can reach that by simply interchange the value of TextView.setMaxLines between 4 for collapsing and Integer.MAX_VALUE for expanding. Now, I would like that this behavior would be accompanied by an animation. I know that in this question one solution is almost done, but I tried to implement it and I have no success. Someone can help me with this? Thanks in advance. (HowTos)