Android similar width/height in all device dimentions

gistfile1.txt

//see https://stackoverflow.com/questions/37067271/android-graphics-drawing-same-size-circles
        float devicePixelsWidth = fragment.getResources().getDisplayMetrics().widthPixels;
        float deviceActualDpi = fragment.getResources().getDisplayMetrics().xdpi ;
        float deviceActualInchWidth = devicePixelsWidth / deviceActualDpi ;
        float deviceActualCMWidth = deviceActualInchWidth * 2.54f ;
        float PixelsForActual3CM = devicePixelsWidth / deviceActualCMWidth * 3;
        float radius = (float) (devicePixelsWidth / deviceActualCMWidth * 0.05);