AlertDailog: android.view.WindowManager$BadTokenException: Unable to add window -- token null is no
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错误内容：AlertDailog: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
原因：new Dialog(context)在创建Dialog时传递的context不是Context的getApplicationContext,而是Activity的context对象
解决方案：传递参数getApplicationContext()改为Activity类名.this,
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