How to Change Drawer Icon in Flutter

You should use MaterialLocalizations :

Widget build(context) {
  return AppBar(
    leading: Builder(
      builder: (BuildContext context) {
        return IconButton(
          icon: const Icon(Icons.menu),
          onPressed: () {
            Scaffold.of(context).openDrawer();
          },
          tooltip: MaterialLocalizations.of(context).openAppDrawerTooltip,
        );
      },
    ),
  );
}

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