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flutter appbar icon

appBar: AppBar(
  title: Text('Hello'),
  actions: [
    IconButton(
      icon: Icon(Icons.settings),
      onPressed: () {},
    ),
    // add more IconButton
  ],
),

how to add icon in the app bar in flutter

AppBar(  title: Text("Hello Appbar"),  leading: Icon(    Icons.menu,  ),);