How to set sketch size as a ratio of displayWidth

[noel]

Please read following topic.

Change the PRESENT mode background color in android

In normal java mode we can change the frame bacground color with f.i.: void setup(){ size(200,200); frame.setBackground(new java.awt.Color( 255 , 0 , 0 )); } But android does not work with the awt lib, but seemingly the android.graphics lib instead How can we change the layout color in android mode.