翻牌的ListView，利用縮放兩張卡片，正面卡片由x軸最大值縮為0，反面卡片由0放大為最大值。
感謝：http://blog.csdn.net/guolin_blog/article/details/10766017/
Use ScaleAnimation to change forward of the card x -axis maximum reduction of 0 , 0 zoom back of the card by the maximum.
Thanks:http://blog.csdn.net/guolin_blog/article/details/10766017/
正面forward
翻面後back
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