wallpapers | My collection of wallpapers with questionable quality | Android Architecture library

import 'package:flutter/material.dart';

class SettingsPage extends StatefulWidget {
  @override
  _SettingsPageState createState() => _SettingsPageState();
}

class _SettingsPageState extends State {
  final List _wallpapers = [
    "wall-1.jpg",
    "wall-2.png",
    "wall-3.jpg",
    "wall-4.jpg",
    "wall-5.jpg",
    "wall-6.png",
    "wall-7.png",
    "wall-8.jpg"
  ];
  @override
  Widget build(BuildContext context) {
    return Container(
      color: Theme.of(context).backgroundColor,
      child: LayoutBuilder(builder: (context, constraints) {
        print("height:${constraints.maxHeight}");
        return SingleChildScrollView(
            child: ConstrainedBox(
          constraints: constraints,
          child: Column(
            children: [
              SizedBox(
                  height: constraints.maxHeight * 0.4,
                  width: constraints.maxWidth,
                  child: Container(
                    color: Colors.red,
                  )),
              const Divider(
                color: Colors.black,
              ),
              Expanded(
                child: GridView.builder(
                   physics: NeverScrollableScrollPhysics(),
                    itemCount: _wallpapers.length,
                    gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(
                      maxCrossAxisExtent: 5,
                    ),
                    itemBuilder: (_, index) {
                      return Container(
                        height: constraints.maxHeight * 0.35,
                        width: constraints.maxWidth * 0.25,
                        margin: const EdgeInsets.all(20.0),
                        decoration: BoxDecoration(
                            image: DecorationImage(
                                image: Image.asset(
                                  "assets/wallpaper/${_wallpapers[index]}",
                                ).image,
                                fit: BoxFit.cover)),
                      );
                    }),
              ),
            ],
          ),
        ));
      }),
    );
  }