Android: Change background color outside of the layout -

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if have layout's width , height set wrap_content, take half screen. if set layout's background white, half screen white while other half remains on default android black. there way set other half, has no layout in it, white?

i want keep layout's width set wrap_content because i'm including in several activities used in top half of screen bottom half vary activity activity.

well, layout contained within decor view of activity - accessible through activitys window, so:

getwindow().getdecorview().setbackgroundcolor(color.green);

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