试用dialog时碰到android.view.WindowManager$BadTokenException: Unable to add window — token null
2013-09-21 15:33
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原因是在创建dialog的时候，需要传入上下文，new AlertDialog.Builder(context),但是这个context不能试用getApplication获得，而必须试用activity，因为只有activity才能添加一个窗口.
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