java - how to remove actionbar from dialog activity -


i have dialog activity , want remove action bar , , anther dialog activity want change color of action bar >>

i tried change theme , style nothing change also.

 <style name ="dialog" parent="theme.appcompat.dialog">      <item name="windowactionbar">false</item>   </style>

and other style 

 <style name ="coloreddialog" parent="theme.appcompat.dialog">     <!-- customize theme here. -->     <item name="colorprimary">@color/colorprimary</item>     <item name="colorprimarydark">@color/colorprimarydark</item>     <item name="coloraccent">@color/coloraccent</item>     <item name="windowactionbar">false</item>   </style>

also have tried use

getsupportactionbar().hide()

but error , app closed


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