how to change size appbar flutter code example
Example 1: flutter how to find the appbar size
var height = AppBar().preferredSize.height;
Example 2: Flutter: Setting the height of the AppBar
appBar: PreferredSize(
preferredSize: Size.fromHeight(100.0),
child: AppBar(
automaticallyImplyLeading: false, // hides leading widget
flexibleSpace: SomeWidget(),
)
),