Flutter align button to bottom of Drawer

look whats the problem with your code you have added a Column as a Child to the Drawer so whatever you add in it are vertically placed and The height of Column is by default shrunk to its children's height and it gets larger as the child gets, so there's no point in adding an Align inside a Column

The Simpler Solution Would be to use an Expanded Widget that takes the remaining Space Look I have used a Column and added A widget above and below the Expanded Widget.

      Drawer(
            elevation: 1.5,
            child: Column(children: <Widget>[
              DrawerHeader(
                  decoration: BoxDecoration(
                color: Colors.redAccent,
              )),
              Expanded(
                  child: ListView(
                padding: EdgeInsets.zero,
                children: <Widget>[
                  ListTile(
                    title: Text('My Cart'),
                    leading: Icon(Icons.shopping_cart),
                    onTap: () {},
                  ),
                  ListTile(
                    title: Text('My Orders'),
                    leading: Icon(Icons.add_shopping_cart),
                    onTap: () {},
                  ),
                  ListTile(
                      title: Text('Logout'),
                      leading: Icon(Icons.exit_to_app),
                      onTap: () {})
                ],
              )),
              Container(
                color: Colors.black,
                width: double.infinity,
                height: 0.1,
              ),
              Container(
                  padding: EdgeInsets.all(10),
                  height: 100,
                  child: Text("V1.0.0",style: TextStyle(fontWeight: FontWeight.bold),)),
            ])),

Edit:

Years on and there's a much easier solution:

return Drawer(
  child: Column(
    children: [
      ListView(), // <-- Whatever actual content you want goes here
      Spacer(), // <-- This will fill up any free-space
      // Everything from here down is bottom aligned in the drawer
      Divider(),
      ListTile(
        title: Text('Settings'),
        leading: Icon(Icons.settings),
      ),
      ListTile(
        title: Text('Help and Feedback'),
        leading: Icon(Icons.help),
      ),
    ]
);

A little late to the party, but here's my solution to this problem:

  @override
  Widget build(BuildContext context) {
    return Drawer(
      // column holds all the widgets in the drawer
      child: Column(
        children: <Widget>[
          Expanded(
            // ListView contains a group of widgets that scroll inside the drawer
            child: ListView(
              children: <Widget>[
                UserAccountsDrawerHeader(),
                Text('In list view'),
                Text('In list view too'),
              ],
            ),
          ),
          // This container holds the align
          Container(
              // This align moves the children to the bottom
              child: Align(
                  alignment: FractionalOffset.bottomCenter,
                  // This container holds all the children that will be aligned
                  // on the bottom and should not scroll with the above ListView
                  child: Container(
                      child: Column(
                    children: <Widget>[
                      Divider(),
                      ListTile(
                          leading: Icon(Icons.settings),
                          title: Text('Settings')),
                      ListTile(
                          leading: Icon(Icons.help),
                          title: Text('Help and Feedback'))
                    ],
                  )
                )
              )
            )
        ],
      ),
    );
  }

This produces the below output where the UserAccountDrawerHeader and the text items can be scrolled around inside the drawer but the Divider and the two ListTiles stay static on the bottom of the drawer.

You need to wrap your Align widget in Expanded.

drawer: Drawer(
  child: Column(
    mainAxisSize: MainAxisSize.max,
    children: <Widget>[
      Text('Top'),
      Expanded(
        child: Align(
          alignment: Alignment.bottomCenter,
          child: Text('Bottom'),
        ),
      ),
    ],
  ),
),