自定义Dialog,第二次点击item报The specified child already has a parent. You must call removeView() on the chil
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原来的对话框中间的view是可以移除的，代码：
contentView为外来传入的，当第一次对对话框进行确认事件的时候没问题，但第二次的时候就会报错：
The specified child already has a parent. You must call removeView() on the child's parent first
原因分析：
第一次显示已经 有了一个ViewGroup，但第二次再次进入的时候，ViewGroup为同一个，在AS里面这种是不允许的，在eclipse里面不会报错。改正后的代码：
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