AndroidException -Unable to add window -- token null is not valid;
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android.view.WindowManager$BadTokenException
“ Unable to add window – token null is not valid; is your activity running”
问题发生在pupowindow
解决方法：
应把pop.showAtLocation()这一句移出oncreate方法，在控件渲染完毕后再使用。
放在控件响应时进行显示！
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