Flutter App: Task List

What this code has done:

• Can create dismissible lists

In the main.dart file

import 'package:flutter/material.dart';
import 'package:task_logger/screens/task_list_screen.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'This is for Android',
      theme: ThemeData(
          brightness: Brightness.light,
          primaryColor: Colors.blue,
          accentColor: Colors.orange),
      home: TaskListScreen(),
    );
  }
}

In the task_list_screen.dart

import 'package:flutter/material.dart';

class TaskListScreen extends StatefulWidget {
  @override
  _TaskListScreenState createState() => _TaskListScreenState();
}

class _TaskListScreenState extends State<TaskListScreen> {
  List tasks = List();
  String input = "";

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("What are you going to do now?"),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          showDialog(
              context: context,
              builder: (BuildContext context) {
                return AlertDialog(
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(8.0),
                  ),
                  title: Text("Add Task"),
                  content: TextField(
                    autofocus: true,
                    onChanged: (String value) {
                      input = value;
                    },
                  ),
                  actions: <Widget>[
                    FlatButton(
                      child: Text("Add"),
                      onPressed: () {
                        setState(() {
                          tasks.add(input);
                        });
                        Navigator.of(context)
                            .pop(); // Remove the dialog after tapping the Add button
                      },
                    ),
                    FlatButton(
                      child: Text("Cancel"),
                      onPressed: () {
                        Navigator.of(context).pop();
                      },
                    )
                  ],
                );
              });
        },
        child: Icon(
          Icons.add,
          color: Colors.white,
        ),
      ),
      body: ListView.builder(
          itemCount: tasks.length,
          itemBuilder: (BuildContext context, int index) {
            return Dismissible(
                // Allow you to remove a task by swiping
                onDismissed: (DismissDirection direction) {
                  setState(() {
                    tasks.removeAt(index);
                  });
                },
                background: Container(),
                secondaryBackground: Container(
                  child: Icon(
                    Icons.delete,
                    color: Colors.white,
                  ),
                  color: Colors.red,
                ),
                key: Key(tasks[index]),
                child: Card(
                  elevation: 2.0,
                  margin: EdgeInsets.all(2.0),
                  shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(8.0)),
                  child: ListTile(
                    title: Text(tasks[index]),
                    trailing: IconButton(
                        icon: Icon(
                          Icons.delete,
                          color: Colors.red,
                        ),
                        onPressed: () {
                          setState(() {
                            tasks.removeAt(index);
                          });
                        }),
                  ),
                ));
          }),
    );
  }
}