android4.0 觸摸屏幕，對話框會消失解決

 

4.0的對話框與2.X,3.X有不一樣之處，它會在對話框外任意點擊就會自動消失，

解決兩種：

void	setCancelable(boolean flag) Sets whether this dialog is cancelable with the BACK key.
void	setCanceledOnTouchOutside(boolean cancel) Sets whether this dialog is canceled when touched outside the window's bounds.