android - Crash on changing action bar color -

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i'm adding 

actionbar bar = getactionbar(); bar.setbackgrounddrawable(new colordrawable(color.parsecolor("#0000ff")));

to main activity oncreate. app's execution starts, stops responding. doing wrong?

my androimanifest

<application android:theme="@style/apptheme" >

my styles

<style name="apptheme" parent="theme.appcompat.light.darkactionbar"></style>

using minsdkversion 21.

assuming using actionbaractivity (as corresponds appcompat theme), should always use getsupportactionbar() instead of getactionbar() - of revision 21, getactionbar() return null actionbaractivity.


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