Android dialog 全屏

<?xml version="1.0" encoding="utf-8"?>  
<resources>  
    <style name="Transparent">    
    <item name="android:windowBackground">@color/transparent_background</item>    
    <item name="android:windowNoTitle">true</item>    
    <item name="android:windowFullscreen">true</item>  
    <item name="android:windowIsTranslucent">true</item>       
    <item name="android:windowAnimationStyle">@+android:style/Animation.Translucent</item>    
  </style>  
</resources>  

View myLoginView = LayoutInflater.from(mContext).inflate(R.layout.activity_answer_category, null);
ListView cList = (ListView) myLoginView.findViewById(R.id.cagetoryList);
cList.setAdapter(new Adapter());
alertDialog = new Dialog(mContext, R.style.Transparent);
alertDialog.setContentView(myLoginView);
alertDialog.show();