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Flutter appbar default size : 56 logical pixels
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appBar: AppBar(
title: Text('AppBar Height'),
toolbarHeight: 100.0, // double
automaticallyImplyLeading: false, // hides back button
),
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appBar: PreferredSize(
preferredSize: Size.fromHeight(100.0),
child: AppBar(
automaticallyImplyLeading: false, // hides leading widget
flexibleSpace: SomeWidget(),
)
),
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AppBar(
title: Text('My App'),
// Set the desired height for the AppBar
toolbarHeight: 80,
// Wrap AppBar with PreferredSize and set preferredSize property
bottom: PreferredSize(
preferredSize: Size.fromHeight(80),
child: Container(
height: 80,
child: Row(
// AppBar content
),
),
),
);