Styling Android ProgressDialog

I want to show custom animation in my ProgressDialog. After reading few posts, I understood that we can define custom styles in styles.xml and provide our own custom drawable there. But, when I am trying to define styles for ProgressDialog, it is not allowing me to do so. Am I doing something wrong here?

< style parent="@android:style/Widget.ProgressDialog" name="MyProgressDialog"> 

< item name="android:progressDrawable">@anim/myanim < /item&开发者_如何学编程gt; 

< /style>

It does not understand Widget.ProgressDialog. What is the difference between ProgressBar and ProgressDialog if I put ProgressBar in Spinner mode ?

I wouldn't use styles to make a custom progress dialog. Making a custom dialog is quite easy when you inflate it from an xml layout.