The app crashed when opening the details about a pokemon who was already in the final stage. Added a conditional statement so that the section is displayed only when the pokemon is not in final form.

my code is :

import 'package:flutter/cupertino.dart'; import 'package:flutter/material.dart'; import 'package:http/http.dart' as http; import 'package:pokemon/pokemon_list_modal.dart'; import 'dart:convert';

void main() => runApp(MaterialApp( title: "Pokemon", theme: ThemeData(primarySwatch: Colors.teal), debugShowCheckedModeBanner: false, home: HomePage(), ));

//MARK:- This is our first Page. class HomePage extends StatefulWidget { // This widget is the root of your application. @override _HomePageState createState() => _HomePageState(); }

class _HomePageState extends State { var url = "https://raw.githubusercontent.com/Biuni/PokemonGO-Pokedex/master/pokedex.json";

PokemonList pokemonList;

@override void initState() { super.initState(); getPokemonList(); // fetchData(); }

getPokemonList() async { var res = await http.get(url); var decodedValue = jsonDecode(res.body); pokemonList = PokemonList.fromJson(decodedValue);

print(pokemonList.pokemon[0].name);

}

Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text("Pokemons"), centerTitle: true, ), body: pokemonList == null ? Center( child: CircularProgressIndicator(), ) : GridView.count( crossAxisCount: 2, // children: [], children: pokemonList.pokemon.map((Pokemon poke) => Card()).toList(), ), drawer: Drawer(), floatingActionButton: FloatingActionButton( onPressed: () {}, child: Icon(Icons.refresh), ), ); } }

Try this :)

Text("Next Evolution", style: TextStyle(fontWeight: FontWeight.bold),), Row( mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: pokemon.nextEvolution?.map((n) => FilterChip( backgroundColor: Colors.green, label: Text(n.name, style: TextStyle(color: Colors.white),), onSelected: (b){} ))?.toList() ?? [Text('No more evolutions')] )

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I was following the code. I got an error. PokeDetail should be a widget so I don't understand why I have this error. here is the code :

import 'pokemonddetail.dart'

Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text("Poke App"), backgroundColor: Colors.cyan, ), body: pokeHub == null ? Center( child: CircularProgressIndicator(), ) : GridView.count( crossAxisCount: 2, children: pokeHub.pokemon .map((poke) => Padding( padding: const EdgeInsets.all(2.0), child: InkWell( onTap: () { Navigator.push( context, MaterialPageRoute( builder: (context) => PokeDetail( pokemon: poke, ))); },

the error is :

MaterialPageRoute( builder: (context) => PokeDetail( pokemon: poke, )));

I followed your code and Im getting this Error I/flutter (12085): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════ I/flutter (12085): The following NoSuchMethodError was thrown building HomePage(dirty, state: _HomePageState#4f655): I/flutter (12085): The getter 'pokemon' was called on null. I/flutter (12085): Receiver: null I/flutter (12085): Tried calling: pokemon I/flutter (12085): I/flutter (12085): When the exception was thrown, this was the stack: I/flutter (12085): #0 Object.noSuchMethod (dart:core/runtime/libobject_patch.dart:50:5) I/flutter (12085): #1 _HomePageState.build package:poke_dex/main.dart:49 I/flutter (12085): #2 StatefulElement.build package:flutter/…/widgets/framework.dart:3825 I/flutter (12085): #3 ComponentElement.performRebuild package:flutter/…/widgets/framework.dart:3736 I/flutter (12085): #4 Element.rebuild package:flutter/…/widgets/framework.dart:3559 I/flutter (12085): #5 ComponentElement._firstBuild package:flutter/…/widgets/framework.dart:3716 I/flutter (12085): #6 StatefulElement._firstBuild

theCode main.dart: import 'dart:convert'; import 'package:flutter/material.dart'; import 'package:http/http.dart' as http; import 'pokemon.dart';

void main() => runApp(MaterialApp( title: "PokeDex", home: HomePage(), debugShowCheckedModeBanner: false, ));

class HomePage extends StatefulWidget { @override _HomePageState createState() => _HomePageState(); }

class _HomePageState extends State {

var url ="https://raw.githubusercontent.com/Biuni/PokemonGO-Pokedex/master/pokedex.json";

pokeData pkData ;

@override void initState() {

super.initState();
pullData();

}

pullData() async { var output = await http.get(url); print(output); var decodedJson = jsonDecode(output.body); pkData=pokeData.fromJson(decodedJson) ; }

@override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text("PokeDex"), backgroundColor: Colors.cyan, ), body: GridView.count( crossAxisCount: 2, children: pkData.pokemon.map((poke)=>Card()).toList() ),

    drawer: Drawer(child: FlutterLogo(),),
    
 floatingActionButton: FloatingActionButton(onPressed: (){ 
   print(Text("ScrollDown"));
   },child: Icon(Icons.search),
   backgroundColor: Colors.red,

  ),
  bottomNavigationBar: BottomAppBar(
     color: Colors.cyan,
     child: Container(height: 50.0,
    ),
   ),
    floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
);

} }