Flutter in solving ListView with AppBar not use blank space appears at the top

ListView head has a blank area, because when used with and without the AppBar ListView, there is a head padding, in order to remove padding, may be used MediaQuery.removePadding

Widget _listView(BuildContext context){
    return MediaQuery.removePadding(
      removeTop: true,
      context: context,
      child: ListView.builder(
        itemCount: 10,
        itemBuilder: (context,index){
          return _item(context,index);
        },

      ),
    );
  }

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