flutter appbar default height code example

Example 1: height appbar flutter

appBar: PreferredSize(
  preferredSize: Size.fromHeight(100.0),
  child: AppBar(
    automaticallyImplyLeading: false, // hides leading widget
    flexibleSpace: SomeWidget(),
  )
),

Example 2: flutter how to find the appbar size

var height = AppBar().preferredSize.height;

Example 3: get app bar size

MediaQuery.of(context).padding.top + kToolbarHeight