Flutter 'SocketException: Failed host lookup' from NetworkImage on android only

Question

Simple app that makes calls to free Chuck Norris API and displays its text. Works as linux app and in Android Studio emulator but not when built as APK and side-loaded to my android tablet. Any ideas? Full error from NetworkImage attempt at loading:

SocketException: Failed host lookup: 'assets.chucknorris.host' (OS Error: No address associated with hostname, errno = 7)

My code follows. The _getJoke call to a URL fails silently, probably for same reason.

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;

void main() {
  runApp(const ChuckNorrisApp());
}

class ChuckNorrisApp extends StatelessWidget {
  const ChuckNorrisApp({Key? key}) : super(key: key);
  final String title = "Chuck Norris'isms";

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: title,
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.indigo,
        backgroundColor: Colors.blueGrey,
      ),
      home: _HomePage(title: title),
    );
  }
}

class _HomePage extends StatefulWidget {
  const _HomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<_HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<_HomePage> {
  String _joke = '';

  Future<void> _getJoke() async {
    Uri url =
        Uri(scheme: 'https', host: 'api.chucknorris.io', path: 'jokes/random');
    var result = json.decode(await http.read(url));
    setState(() => _joke = result['value']);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
          title: Row(
        children: [
          Text(widget.title),
          Image(
            image: const NetworkImage(
                'https://assets.chucknorris.host/img/avatar/chuck-norris.png'),
            errorBuilder: (context, error, stackTrace) =>
                SelectableText(error.toString()),
          ),
        ],
      )),
      body: Container(
        decoration: const BoxDecoration(
          color: Colors.blueGrey,
        ),
        child: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Padding(
                padding: const EdgeInsets.all(20.0),
                child: SelectableText(
                  _joke,
                  style: Theme.of(context).textTheme.headline4,
                ),
              ),
            ],
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _getJoke,
        tooltip: 'Next',
        child: const Icon(
          Icons.announcement_rounded,
        ),
      ),
    );
  }
}

CPlus · Accepted Answer · 2023-03-29 21:45:29Z

3

I found this guide and added the following to the AndroidManifest.xml and it now works:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

edited Mar 29, 2023 at 21:45

CPlus

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answered Dec 31, 2021 at 23:35

CraigFoote

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Comments

Kingshuk Saha · Accepted Answer · 2022-10-16 18:31:31Z

1

If you're using a physical device to emulate, don't forget to check if you have Internet turned on.

answered Oct 16, 2022 at 18:31

Kingshuk Saha

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