Develop Reference

Unable to Send Sms using Telephony package on flutter

I have been trying to write a simple flutter code and trying to send SMS using telephony. Sending Sms via the default SMS app works (telephony.sendSmsByDefaultApp()) but not sending directly from the app.
My code is as follows:
import 'package:flutter/material.dart';
import 'package:telephony/telephony.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Center(
child: ElevatedButton(
onPressed: () {
sendSMS();
},
child: Text("Send SMS"),
),
),
),
);
}
void sendSMS() async {
final Telephony telephony = Telephony.instance;
bool? permissionsGranted = await telephony.requestPhoneAndSmsPermissions;
print(permissionsGranted);
await telephony.sendSms(to: "+92xxxxxxxxxx", message: "Hello, this is a test message.");
print("SMS Sent");
}
}
I have added the following required permissions
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />

can you try the code
https://d7networks.com/docs/Messages/Send_Message/
we need to have an account on https://d7networks.com/ platform.

Have you tried changing that onPressed() function in the ElevatedButton(), to an async function:
ElevatedButton(
onPressed: () async {
await sendSMS();
},
child: Text("Send SMS"),
)
And then change your sendSMS() function to return a Future<void>, instead of void:
Future<void> sendSMS() async {
final Telephony telephony = Telephony.instance;
bool? permissionsGranted = await telephony.requestPhoneAndSmsPermissions;
print(permissionsGranted);
await telephony.sendSms(to: "+92xxxxxxxxxx", message: "Hello, this is a test message.");
print("SMS Sent");
}
}

Firebase auth not persisting on iOS or Android in Flutter

To start, I have gone through more than 20 different questions and solutions here on Stack Overflow about this topic (most of them are related to the web version), I have also tried twitter, and even the FlutterDev Discord server and cannot seem to find this issue.
I am using firebase for mobile authentication for my app, and no matter what I try, I cannot seem to get the persistent auth state to work on iOS or Android.
Here is my main:
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(
MultiProvider(
...
child: const MyApp(),
),
);
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
final const ColorScheme colorScheme = ColorScheme(
...
);
#override
Widget build(BuildContext context) {
bool isDebug = false;
if (Constants.DEBUG_BANNER == 'true') {
isDebug = true;
}
return MaterialApp(
theme: ThemeData(
...
),
routes: {
// This is a general layout of how all my routes are in case this is the issue
Screen.route: (BuildContext context) => const Screen(),
},
home: const HomeScreen(),
debugShowCheckModeBanner: isDebug,
);
}
}
the ... is just code that I think is unrelated to my question and so I am hiding it for brevity. Mostly themes, and private data
Let's just start with my google-sign-in-button and if necessary I can share others if it is important. We are using Facebook, Google, and Apple for iOS.
class GoogleSignInButton extends StatefulWidget {
const GoogleSignInButton({Key? key}) : super(key: key);
#override
_GoogleSignInButtonState createState() => _GoogleSignInButtonState();
}
class _GoogleSignInButtonState extends State<GoogleSignInButton> {
bool _isSigningIn = false;
#override
Widget build(BuildContext context) {
return Padding(
padding: const EdgeInsets.only(bottom: 16.0),
child: _isSigningIn
? CircularProgressIndicator(
valueColor: AlwaysStoppedAnimation<Color>(MRRM.colorScheme.primary),
)
: OutlinedButton(
key: const Key('google_sign_in_button'),
style: ButtonStyle(
backgroundColor: MaterialStateProperty.all(Colors.white),
shape: MaterialStateProperty.all(
RoundedRectangleBorder(
borderRadius: BorderRadius.circular(40),
),
),
),
onPressed: () async {
setState(() {
_isSigningIn = true;
});
context.read<Member>().signInWithGoogle(context: context).then<void>((void user) {
setState(() {
_isSigningIn = false;
});
Navigator.pushReplacementNamed(context, UserInfoScreen.route);
});
},
child: Padding(
padding: const EdgeInsets.fromLTRB(0, 10, 0, 10),
child: Row(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Image(
image: AssetImage('assets/images/png/google_logo.png'),
height: 35.0,
),
Padding(
padding: const EdgeInsets.only(left: 10),
child: Text(
'Sign in with Google',
style: TextStyle(
fontSize: 20,
color: MRRM.colorScheme.secondary,
fontWeight: FontWeight.w600,
),
))
],
),
),
),
);
}
}
I am using the provider pub, which is what context.read<Object?>() is from.
Here is the signInWithGoogle function;
Future<String> signInWithGoogle({required BuildContext context}) async {
final FirebaseAuth _auth = FirebaseAuth.instance;
final GoogleSignIn googleSignIn = GoogleSignIn();
final GoogleSignInAccount? googleSignInAccount =
await googleSignIn.signIn();
if (googleSignInAccount != null) {
final GoogleSignInAuthentication googleSignInAuthentication =
await googleSignInAccount.authentication;
final AuthCredential credential = GoogleAuthProvider.credential(
accessToken: googleSignInAuthentication.accessToken,
idToken: googleSignInAuthentication.idToken,
);
try {
final UserCredential userCredential =
await _auth.signInWithCredential(credential);
_firebaseUser = userCredential.user!;
_authType = AuthType.Google;
_uuId = _firebaseUser.uid;
notifyListeners();
} on FirebaseAuthException catch (e) {
if (e.code == 'account-exists-with-different-credential') {
ScaffoldMessenger.of(context).showSnackBar(
customSnackBar(
content: 'The account already exists with different credentials.',
),
);
} else if (e.code == 'invalid-credential') {
ScaffoldMessenger.of(context).showSnackBar(
customSnackBar(
content: 'Error occurred while accessing credentials. Try again.',
),
);
}
} catch (e) {
ScaffoldMessenger.of(context).showSnackBar(
customSnackBar(
content: 'Error occurred using Google Sign-In. Try again.',
),
);
}
}
return getMemberLogin();
}
This is contained in my Member object, which just stores all of the Auth data as well as the Member specific data that comes from one of our internal API's, and the member data is stored as an App State object in provider, which is linked in the main.dart file
The getMemberLogin() function is just taking the UUID from the auth and sending it to an API and getting internal member data, I would hope that a simple post request isn't what is causing this. but if you think it might let me know and I will try to post it while obfuscating any NDA related data.
This is the home/splash Screen that handles the initial routing and goes to the loadingScreen that is supposed to be checking if there is a persisted login and going to the UserInfo screen instead of the Auth Screen.
class HomeScreen extends StatefulWidget {
const HomeScreen({Key? key}) : super(key: key);
static const String route = '/home';
#override
_HomeScreenState createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
key: const Key('Home'),
children: <Widget>[
Expanded(
child: Image.asset('assets/images/png/Retail_Rebel_Primary.png'),
),
BlinkingTextButton(
key: const Key('blinking_text_button'),
textButton: TextButton(
child: Text(
'Tap to continue',
style: TextStyle(
color: MRRM.colorScheme.primary,
fontSize: 16.0,
),
),
onPressed: () {
Navigator.of(context).pushReplacementNamed(LoadingScreen.route);
},
),
),
Container(
height: 8.0,
),
],
),
);
}
}
And lastly, this is the LoadingScreen that the HomeScreen navigates to:
class LoadingScreen extends StatelessWidget {
const LoadingScreen({Key? key}) : super(key: key);
static const String route = '/loadingScreen';
#override
Widget build(BuildContext context) {
return StreamBuilder<User?>(
stream: FirebaseAuth.instance.authStateChanges(),
builder: (BuildContext context, AsyncSnapshot<User?> snapshot) {
if (snapshot.connectionState == ConnectionState.waiting) {
if (snapshot.hasData) {
print('user is logged in');
SchedulerBinding.instance!.addPostFrameCallback((_) {
Navigator.of(context).pushReplacementNamed(UserInfoScreen.route);
});
return const Text('');
} else {
print('no user is logged in');
SchedulerBinding.instance!.addPostFrameCallback((_) {
Navigator.of(context).pushReplacementNamed(AuthScreen.route);
});
return const Text('');
}
}
return const SplashScreen();
},
);
}
}
Not sure if possibly the way that I am handing routing may be the issue, but it is very common for me to use Navigator.of(context).pushReplacementNamed(); unless popping is necessary then I will typically just use Navigator.of(context).pop();. I usually only use .pop() for modals/alertDialogs, and for things like QR scanners to return to previous screen.
Sorry if this is too much info, or I forgot a ton of stuff. I have been working on trying to get this fixed for a little over a week now and am kind of getting frustrated.
Thank you for any and all responses.
Just because I think it is important to see what I have looked at already, here is a list of a couple of other questions I have looked through that did not help.
This one I believe is dated as of August 2020, especially considering that onAuthStateChanges has been changed to a stream authStateChanges().
I have also tried just implementing auth in the exact way described in the docs here but same issue.
I also tried just using:
FirebaseAuth.instance.authStateChanges().then((User? user) {
if (user != null) {
Navigator.of(context).pushReplacementNamed(UserInfoScreen.route);
} else {
Navigator.of(context).pushReplacementNamed(AuthScreen.route);
}
Which didn't work. I have also attempted to just simply check if there is a current user with:
User user = FirebaseAuth.instance.currentUser;
if (user != null && user.uid != null) {
Navigator.of(context).pushReplacementNamed(UserInfoScreen.route);
} else {
Navigator.of(context).pushReplacementNamed(AuthScreen.route);
}
which still always went to AuthScreen I have also tried all of these methods as asynchronous tasks to see if maybe it is just taking a second to load, and same issue. The weirdest one is with the current method if I take out the if(snapshot.connectionState == ConnectionState.waiting) from the LoadingScreen it will print out no user is logged in immediately followed by user is logged in and then no user is logged in again and then it will navigate to AuthScreen

If you follow what I have done up above, and make a single change, it will work with persisted logins.
change:
class LoadingScreen extends StatelessWidget {
const LoadingScreen({Key? key}) : super(key: key);
static const String route = '/loadingScreen';
#override
Widget build(BuildContext context) {
return StreamBuilder<User?>(
stream: FirebaseAuth.instance.authStateChanges(),
builder: (BuildContext context, AsyncSnapshot<User?> snapshot) {
if (snapshot.connectionState == ConnectionState.waiting) {
if (snapshot.hasData) {
print('user is logged in');
SchedulerBinding.instance!.addPostFrameCallback((_) {
Navigator.of(context).pushReplacementNamed(UserInfoScreen.route);
});
return const Text('');
} else {
print('no user is logged in');
SchedulerBinding.instance!.addPostFrameCallback((_) {
Navigator.of(context).pushReplacementNamed(AuthScreen.route);
});
return const Text('');
}
}
return const SplashScreen();
},
);
}
}
to
class LoadingScreen extends StatelessWidget {
const LoadingScreen({Key? key}) : super(key: key);
static const String route = '/loadingScreen';
#override
Widget build(BuildContext context) {
return StreamBuilder<User?>(
stream: FirebaseAuth.instance.authStateChanges(),
builder: (BuildContext context, AsyncSnapshot<User?> snapshot) {
if (snapshot.connectionState == ConnectionState.active) {
if (snapshot.hasData) {
print('user is logged in');
SchedulerBinding.instance!.addPostFrameCallback((_) {
Navigator.of(context).pushReplacementNamed(UserInfoScreen.route);
});
return const Text('');
} else {
print('no user is logged in');
SchedulerBinding.instance!.addPostFrameCallback((_) {
Navigator.of(context).pushReplacementNamed(AuthScreen.route);
});
return const Text('');
}
}
return const SplashScreen();
},
);
}
}

Methods are not getting executed in the written order inside onPressed

Im trying to create a flutter app with a simple raised button that does the following:
sends an sms in the background using the sms package opens a webpage
2. in the app(only for 5 seconds) using url_launcher opens the phones
3. native app for making a voice call with the onPressed property.
And I wanted it to be in this order so that I can make the phone call at the end. However, the inside the onPressed opens the native phone call app first, which doesnt let my web page open unless I exit out of the phone call app.
Im having a hard time understanding why the phone call native app is opened first, even though I make the call the _makePhoneCall() method only after I make the _launchInApp(toLaunch) call. sendSMS() is being called correctly
How can I set this in a way that the phone call native app is called only after the webpage is opened in the app and follows the order? Any help would be great
Below is the piece of code:
import 'package:flutter/material.dart';
import 'package:url_launcher/url_launcher.dart';
import 'package:sms/sms.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Packages testing',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Packages testing'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
String _phone = '';
_launchInApp(String url) async {
if (await canLaunch(url)) {
await launch(
url,
forceSafariVC: true,
forceWebView: true,
headers: <String, String>{'my_header_key': 'my_header_value'},
);
} else {
throw 'Could not launch $url';
}
}
_makePhoneCall(String url) async {
if (await canLaunch(url)) {
await launch(url);
} else {
throw 'Could not launch $url';
}
}
void sendSMS() {
SmsSender sender = new SmsSender();
sender.sendSms(new SmsMessage(_phone, 'Testing Handset'));
}
#override
Widget build(BuildContext context) {
const String toLaunch = 'https://flutter.dev/';
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: ListView(
children: <Widget>[
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Padding(
padding: const EdgeInsets.all(16.0),
child: TextField(
onChanged: (String text) => _phone = text,
decoration:
const InputDecoration(hintText: 'Phone Number')),
),
FlatButton(
onPressed: () => setState(() {
sendSMS();
_launchInApp(toLaunch);
_makePhoneCall('tel:$_phone');
}),
child: const Text('Run All'),
),
const Padding(padding: EdgeInsets.all(16.0)),
],
),
],
),
);
}
}

You will have to use the await keyword before the _launchInApp function to make it work properly. Try the following code.
FlatButton(
onPressed: () aync {
sendSMS();
await _launchInApp(toLaunch);
_makePhoneCall('tel:$_phone');
}),
child: const Text('Run All'),
),

You created async functions but when you called them you did not specify that you want to wait for them to complete. Add the await keyword in OnPressed

I want to get all MP3 files from the Android storage device in my audio player app in Flutter and show them in the Listview.Builder

I am making a music player app in Flutter and want to show a list of all songs fetched from the internal storage of device, but I can't see to find the correct code.
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:path_provider/path_provider.dart';
class Songlist extends StatefulWidget {
#override
_SonglistState createState() => _SonglistState();
}
class _SonglistState extends State<Songlist> {
#override
void initState() {
super.initState();
initlist();
}
void initlist() async {
if (await Permission.storage.request().isGranted) {
Directory dir = await getExternalStorageDirectory();
List<FileSystemEntity> files;
files = dir.listSync(recursive: true, followLinks: false);
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Your Media"),
backgroundColor: mycolor,
),
/* body: new ListView.builder(
padding: const EdgeInsets.all(16.0),
itemCount: files.length,
itemBuilder: (context, i) {
return buildRow(_files.elementAt(i).path);
}),
*/
);
}
}

You can use the flute_music_player package to get the songs.
First add these two permissions to your manifest:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
Then get the songs:
List<Song> songs = [];
Future<void> getSongs() async {
songs = await MusicFinder.allSongs();
}
#override
void initState() {
super.initState();
getSongs();
}
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: ListView.builder(
itemCount: songs.length,
itemBuilder: (context, index) {
var song = songs[index];
return ListTile(
title: Text(song.title),
subtitle: Row(
children: [
Text(song.artist),
],
),
);
},
),
),
);
}

JSON file data not loading after install flutter app

I am a new learner of android app development with Flutter framework. I am trying to load a JSON file from asset and show the data by listview. It's working with development mode (flutter run) but when I build the apk and install it on my android phone the JSON file is not loading and no data showing on my app.
flutter build apk
flutter install
I have tried with this code.
import 'package:flutter/material.dart';
import 'dart:async' show Future;
import 'package:flutter/services.dart' show rootBundle;
import 'dart:convert';
void main() {
runApp(new MaterialApp(
home: new HomePage(),
));
}
class HomePage extends StatefulWidget {
#override
HomePageState createState() => new HomePageState();
}
class HomePageState extends State<HomePage> {
List data;
Future<String> loadZipCodes() async {
var jsonString = await rootBundle.loadString('assets/data/cse.json');
data = JSON.decode(jsonString);
print(data[1]);
return 'success';
}
#override
void initState() {
this.loadZipCodes();
}
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Home'),
),
body: new ListView.builder(
itemCount: data == null ? 0 : data.length,
itemBuilder: (BuildContext context, int index) {
return new Card(
child: new Container(
padding: new EdgeInsets.all(15.0),
child: new Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
new Text(data[index]["sort_term"],style: new TextStyle(fontSize: 16.0, fontWeight: FontWeight.bold)),
new Text(data[index]["long_term"])
])));
},
));
}
}
Please help me to figure out what is the problem going on. Thanks in advance.

give this permission in app>main>AndroidManifest.xml
<uses-permission android:name="android.permission.INTERNET">
set internet permission in the above file