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Example - 1

Animated Container

import 'dart:math' show Random;

import 'package:flutter/material.dart';

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Analysis Options

Auto-generated options enabling all lints. Add these to your analysis_options.yaml file and tailor to fit! It's boolean so assign true or false value inside flutter analysis_option.yaml file

linter:
  rules:
    - always_declare_return_types:
    - always_put_control_body_on_new_line:

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<uses-permission android:name="android.permission.ACCESS_ALL_DOWNLOADS"/>
<uses-permission android:name="android.permission.ACCESS_BLUETOOTH_SHARE"/>
<uses-permission android:name="android.permission.ACCESS_CACHE_FILESYSTEM"/>
<uses-permission android:name="android.permission.ACCESS_CHECKIN_PROPERTIES"/>
<uses-permission android:name="android.permission.ACCESS_CONTENT_PROVIDERS_EXTERNALLY"/>
<uses-permission android:name="android.permission.ACCESS_DOWNLOAD_MANAGER"/>
<uses-permission android:name="android.permission.ACCESS_DOWNLOAD_MANAGER_ADVANCED"/>
<uses-permission android:name="android.permission.ACCESS_DRM_CERTIFICATES"/>
<uses-permission android:name="android.permission.ACCESS_EPHEMERAL_APPS"/>
<uses-permission android:name="android.permission.ACCESS_FM_RADIO"/>

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// demo json file. --------Note the image is from local assest file. so use Image.assest method in dart to access. for network use Image.network in flutter
// place json file outside of lib folder
[
    {
        "id": 0,
        "name": "NexMart - Casual Sneakers",
        "category": "NOP",
        "imageUrl": "img/header_onboarding/first_header.png",
        "oldPrice": "1899",
        "price": "799"

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import 'dart:ui';
import 'package:flutter/gestures.dart';
import 'package:flutter/widgets.dart';

extension Responsive on BuildContext {
  
  
  // width = yourDeviceWidth, height = yourDeviceHeight
  
  

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// c represents the Celsius value which you will add according to mode of conversion you want.
// r represents the Rankine value which you will add according to mode of conversion you want
// k represents the Kelvin value which you will add according to mode of conversion you want.
// f represents the Fahrenheit value which you will add according to mode of conversion you want


class Temperature {
  double celsiusToFahrenheit(num c) {
    return (c * 9 / 5 + 32);
  }

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// Define a simple format function from scratch
String dateTimeformat({required DateTime time, bool dateOnly = false}) {
  String year = time.year.toString();

  // Add "0" on the left if month is from 1 to 9
  String month = time.month.toString().padLeft(2, '0');

  // Add "0" on the left if day is from 1 to 9
  String day = time.day.toString().padLeft(2, '0');

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// Method 
// Initialize it into the initState

var files = <FileSystemEntity>[];
  Future<List<FileSystemEntity>> dirContents(Directory dir) async {
    var completer = Completer<List<FileSystemEntity>>();
    var lister = dir.list(recursive: false, followLinks: false);

    lister.listen((file) async {
      FileStat f = file.statSync();

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// accesing and requesting

 Future<List<Directory>?>? _externalStorageDirectory; // this will go in future in future builder



// this will go in onPresssed if you wanna use button to request everything

  void requestExternalStorageDirectory(StorageDirectory type) {

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void main(){
  while (true) {
    print("Rock, Paper, Scissors Shoot!");
    String playerMove = getPlayerMove();

    if (playerMove == "Quit") {
      return;
    }

    print("You played $playerMove");