In the layout's XML you can set the property android:background to an RGB value like this "#ffff0000" which is an opaque red. But doing it that way kinda stinks.
You're better off defining your colors in a colors.xml file then adding resources and using the resources in your layout XML. This page describes it pretty well.
found the answer finaly >>>how to set the THEME theres a button right above the layout ,,lol ive been tring to change it by changing the back ground color.
thanks all
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