Flutter Basics

Question 1

Material app

Answer 1

root app that’s required by most other widgets

Question 2

scaffold

Answer 2

screen layout widget that adds base styling and more

Question 3

What do you do with widgets?

Answer 3

Combine multiple widgets to build UI

Question 4

const is used

Answer 4

will not create a second saved value if that widget is used again - lets dart reuse values and avoid duplication in memory to improve performance

Question 5

Don’t need to remember when to add cons

Answer 5

the code editor will show blue squiggle lines to tell you to use const

Question 6

To get a phrase to display on the app like “Hello World you need types

Answer 6

String and Object

Question 7

To get a number to display as a number you need types:

Answer 7

int, num, and Object

Question 8

Colors lets you

Answer 8

access predefined colors ex. backgroundColor: Colors.deepPurple,

Question 9

Color lets you

Answer 9

set RGB values for the color ex. backgroundColor: Color.fromARGB(255,47,5,120),

Question 10

main function

Answer 10

will be executed automatically by dart when app is opened on a device

Question 11

need 2 core widgets to get UI working:

Answer 11

MaterialApp and home

Question 12

child: Center(
//says what will show
child: Text(‘Hello World!’)
),

Answer 12

says where to put the code in the scaffolding

Question 13

color gradients is listed in an

Answer 13

array

Question 14

how to get custom gradient locations

Answer 14

begin: Alignment.topLeft,
end: Alignment.bottomRight,

can also do Alignment(x,y) and add the coordinates

Question 15

text style formatting

Answer 15

Text(‘Hello World!’, style: TextStyle(
color: Colors.white,
fontSize: 28.0,
) )//TextStyle //Text

Question 16

How to name classes

Answer 16

Should use camel case
Should describe what the class is about

Question 17

class format

Answer 17

class GradientContainer extends StatelessWidget {
@override
Widget build(context) {
return “Hello World”,
}
}

Question 18

classes can be stored

Answer 18

on same file or different file. different file needs to be imported

Question 19

new file name should be formatted…

Answer 19

all lower case and words separated by underscore ex. gradient_container

Question 20

cntrl + space

Answer 20

gives suggestions on vscode

Question 21

variable name format

Answer 21

starts with lower case ex. startAlignment

Question 22

if variable value does not change

Answer 22

use final instead of var to initiate it

Question 23

lists in dart can always be

Answer 23

edited

Question 24

format for an image widget

Answer 24

child:Image.asset(‘assets/image/dice-2.png’, width: 200,),
(if image is imported in .yaml folder)

Question 25

Stateful widget

Answer 25

allow us to manage state (data that may change) inside of them

Question 26

initState():Executed by Flutter when the StatefulWidget’s State object is

Answer 26

initialized

Question 27

build():Executed by Flutter when the Widget

Answer 27

is built for thefirst timeANDaftersetState()was called