Mediz size property

// full screen width and height
double width = MediaQuery.of(context).size.width;
double height = MediaQuery.of(context).size.height;

// height without SafeArea
var padding = MediaQuery.of(context).padding;
double height1 = height - padding.top - padding.bottom;

// height without status bar
double height2 = height - padding.top;

// height without status and toolbar
double height3 = height - padding.top - kToolbarHeight;