android - Why doesn't supportRequestWindowFeature() work? -

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i have problem , i've been trying find mistake couple hours can't find it?

my situation: don't want titlebar appears. device htc , runs android 2.3.3. tried supportrequestwindowfeature() somehow doesn't work.

my code here:

  @override   protected void oncreate(bundle savedinstancestate) {      super.oncreate(savedinstancestate);     supportrequestwindowfeature(window.feature_no_title);     setcontentview(r.layout.activity_main);   }

also mainactivity extends actionbaractivity.


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