1 Window 的getCallback()方法，返回當前視窗的當前Callback介面 Activity，Dialog中setCallback(this),傳當前Activity，dialog

 if (getWindow().getCallback() instanceof Activity){
       Log.e("Activity",""+getWindow().getCallback());
   }
    if (dialog.getWindow().getCallback() instanceof Dialog){
       Log.e("Dialog",""+dialog.getWindow().getCallback());//自定義的Dialog
 }
 列印：
 E/Activity: 
 
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 E/Dialog: [email protected]