Flutter: Navigation drawer with expansion tile - flutter

Question

I`m trying to build a navigation drawer with expansion tile, when i click on the header it collapse and vice versa
but when i set the the drawer header as a child of ExpansionTile, original header padding is lost
Widget _buildDrawer() {
return Drawer(
child: ExpansionTile(
title: UserAccountsDrawerHeader(
decoration: BoxDecoration(color: Colors.deepPurple),
accountName: Text("Mohamed Ali"),
accountEmail: Text("mohamed.ali6996#hotmail.com"),
currentAccountPicture: CircleAvatar(
child: Text("M"),
backgroundColor: Colors.white,
),
),
children: <Widget>[
ListTile(
title: Text("page one"),
trailing: Icon(Icons.android),
onTap: () => _onSelectedItem(0),
),
ListTile(
title: Text("page two"),
trailing: Icon(Icons.accessible),
onTap: () => _onSelectedItem(1),
),
Divider(),
ListTile(
title: Text("Log out"),
trailing: Icon(Icons.exit_to_app),
),
],
initiallyExpanded: false,
)
);
}

Answer 1

The problem is that the header takes the place of the first tile in the ExpansionTile.
One possible solution is to use a Stack and tweak the content with an Align so the expansion icon is at the bottom of the header.
Changing the color of the expanding icon may not work for you. There is a reported issue here for which I have already submitted a PR here. Don't know when it will land in master.
_buildDrawer(BuildContext context) {
ThemeData theme = Theme.of(context);
return Drawer(
child: Stack(
children: <Widget>[
UserAccountsDrawerHeader(
decoration: BoxDecoration(color: Colors.indigo),
),
Positioned(
top: 120.0,
left: 0.0,
right: 0.0,
child: Theme(
data: theme.copyWith(
textTheme: theme.textTheme.copyWith(
subhead: theme.textTheme.subhead.copyWith(
color: Colors.grey,
),
),
accentColor: Colors.white,
unselectedWidgetColor: Colors.grey,
iconTheme: theme.iconTheme.copyWith(color: Colors.white),
dividerColor: Colors.transparent,
),
child: ExpansionTile(
title: Align(
heightFactor: 0.4,
alignment: Alignment.bottomCenter,
child: UserAccountsDrawerHeader(
decoration: BoxDecoration(color: Colors.transparent),
accountName: Text("Mohamed Ali"),
accountEmail: Text("mohamed.ali6996#hotmail.com"),
currentAccountPicture: CircleAvatar(
child: Text("M"),
backgroundColor: Colors.white,
),
),
),
children: <Widget>[
ListTile(
title: Text("page one"),
trailing: Icon(Icons.android),
onTap: () => {},
),
ListTile(
title: Text("page two"),
trailing: Icon(Icons.accessible),
onTap: () => {},
),
Container(
height: 1.0,
color: Color(0xFFDDDDDD),
),
ListTile(
title: Text("Log out"),
trailing: Icon(Icons.exit_to_app),
),
],
initiallyExpanded: false,
),
),
),
],
),
)
}