Android: Changing Background-Color of the Activity (Main View)

Question

I want to change the background color of my Main-View (not a Button or a Text-View) just the real background which is usually black... I got this code:

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Answer 1

I just want to add my 2 cents. I had the same goal (to change the background color from the .java class). But none of the above methods worked for me.

Issue was, that I set the background color inside the layout .xml file with android:background="@color/colorGray":

So I just deleted particular line:

Now I (you) can set the color from the code with:

getWindow().getDecorView().setBackgroundColor(Color.GRAY);