I want to connect my Flutter app to bluetooth device with flutter_blue library, and return a result (anything) when the connection is ON. But I don't understand how to do.
Here my code :
Future connect(BluetoothDevice device) async {
_btDevice = device;
StreamSubscription<BluetoothDeviceState> subscription;
subscription = device.state.listen((event) async {
if (event != BluetoothDeviceState.connected) {
await device.connect();
} else {
await device.discoverServices().then((value) => _initFeatures(value));
}
})
..onDone(() {
// Cascade
print("onDone");
});
subscription.asFuture();
//subscription.cancel();
}
And when I call this function with
await newDevice.connect(bluetoothDevice).then((value) => print('OK'));
OK is written before the real connection. _initFeatures if well call when the device is connected.
I try to use asFuture from StreamSubscription with onDone, but that change nothing.
Could you help me please ?
UPDATE 12/10
I've worked on another project for few monthes, and when I come back, I can't solve the problem, so I add the full code.
The concept is a class widget calls the connect future in other class and need to receipt the end of work.
Widget
Future<void> _connectDevice() async {
try {
widget.device.connect(widget.btDevice!).then((value) => _initValue());
} catch (e) {
print(e);
}
}
_initValue() is a method to create the rest of the screen
and the Future connect()
Future connect(BluetoothDevice device) async {
_btDevice = device;
StreamSubscription<BluetoothDeviceState> subscription;
subscription = device.state.listen((event) async {
if (event != BluetoothDeviceState.connected) {
await device.connect();
} else {
await device
.discoverServices()
.then((value) => _initFeatures(value))
.then((value) => print("OK"));
}
});
await subscription.asFuture();
await subscription.cancel();
}
What I'd like is the Future finishes when print("OK") is called, in order .then((value) => _initValue()); is called.
The problem is only this end. Maybe it's not the good way to implement this kind of solution.
Related
I have been working on an application and I need to implement in app audio and video calling in my app which I have done using Agora.io but the issue is I have to display incoming call notification does not matter if app is in foreground or in background. I have tried many things but still I am unable to configure that out. I am using agora_rtc_engine package for making calls.
Any help would be appreciated.
Thanks
The code I am working with currently:
Call Methods
class CallMethods {
final callRef = FirebaseFirestore.instance.collection('Calls');
Stream<DocumentSnapshot> callstream({#required String id}) =>
callRef.doc(id).snapshots();
Future<bool> makeCall({#required Call call}) async {
try {
log('Making call');
call.hasdialed = true;
Map<String, dynamic> hasDialedMap = call.toMap(call);
call.hasdialed = false;
Map<String, dynamic> hasNotDialedMap = call.toMap(call);
await callRef.doc(call.senderid).set(hasDialedMap);
await callRef.doc(call.receiverid).set(hasNotDialedMap);
return true;
} catch (e) {
print(e);
return false;
}
}
Future<bool> endCall({#required Call call}) async {
try {
log('ending call');
await callRef.doc(call.senderid).delete();
await callRef.doc(call.receiverid).delete();
return true;
} catch (e) {
print(e);
return false;
}
}
}
Call Utils: Which is used to make calls
class CallUtils {
static final CallMethods callmethods = CallMethods();
static dial(
BuildContext context, {
#required User from,
#required var to,
}) async {
Call call = Call(
senderid: from.id,
// senderpic: from.avatar.url,
callername: from.name,
receiverid: to.id,
// receiverpic: to.avatar.url,
receivername: to.name,
channelid: Random().nextInt(999999).toString(),
);
bool callmade = await callmethods.makeCall(call: call);
call.hasdialed = true;
if (callmade) {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => VideoCallScreen(call: call),
),
);
}
}
}
After that I have a pickup layout which is used to wrap all the screens to display incoming call notification.
Pickup Call Layout:
(user.value.id != null)
? StreamBuilder<DocumentSnapshot>(
stream: callmethods.callstream(id: user.value.id),
builder: (context, snapshot) {
if (snapshot.hasData && snapshot.data.data() != null) {
Call call = Call.fromMap(snapshot.data.data());
if (!call.hasdialed) {
return PickupScreen(call: call);
} else {
return widget.scaffold;
}
} else {
return widget.scaffold;
}
},
)
: widget.scaffold,
It can be done via firebase push notifications & backend API service.
Sender side:
As soon as a call is made, you would post your backend api service with caller and receiver id, and your backend service is further responsible to send a push notification with a payload to the receiver.
Receiver side:
When receiver gets a push notification, you can configure it to open your app automatically and show a screen with all the payload information. Maybe you can show him a screen with accept and decline button and if he accepts, you can connect him to Agora.
Check this for payload configuration.
I have checked internet connectivity in flutter while calling api in store class like this using 'connectivity' library.
Future<bool> callApi() async {
final isInternet = await Util.checkInternetAndShowDialog(context);
if (isInternet) {
final future = _repository.callApi();
var res = await future;
return true;
}
return false;
}
In Util class network connectivity is been checked like this::
class Util {
static Future<bool> checkInternetAndShowDialog(BuildContext context) async{
var internet = await NetworkConnectivity.rechability();
if (internet == false) {
AlertMessage().showAlertDialog(context, 'error message');
}
return internet;
}
}
In NetworkConnectivity class network connectivity is been checked using Connectivity library.
class NetworkConnectivity {
static Future<bool> rechability() async {
var connectivityResult = await (Connectivity().checkConnectivity());
if (connectivityResult == ConnectivityResult.mobile) {
return true;
} else if (connectivityResult == ConnectivityResult.wifi) {
return true;
}
return false;
}
}
my test cases code is like below:
test('call api successfully', () async {
when(mockStore.callApi()).thenAnswer((realInvocation) => Future.value());
expect(await store.callApi(), true);
});
so while writing unit testing I am facing error of connectivity and method channel.
connectivity error image
Can any one help please me how I can mock for internet connectivity in unit testing and pass the test in flutter. I shall be thankful for this.
I am doing an app in flutter and I am working on the authentication part. I want to know how I can keep my user logged in after I reload the app. Now the thing is that my app has 2 kinds of users (Client and Driver). So each has its own space, like sign in and sign up and main (after logging in).
This is the code that I used for logging.
class Initializer extends StatefulWidget {
// Access to this Screen
static String id = 'initializer';
#override
_InitializerState createState() => _InitializerState();
}
class _InitializerState extends State<Initializer> {
// Firebase Stuff
final _auth = FirebaseAuth.instance;
final FirebaseFirestore _firestore = FirebaseFirestore.instance;
User _user;
// To Check if There's a Driver
bool isDriver = true;
void getCurrentUser() async {
try {
final getCurrentUser = _auth.currentUser;
if (getCurrentUser != null) {
getUserKind();
_user = getCurrentUser;
}
} catch (e) {
print(e);
}
}
getUserKind() async {
try {
// To fetch Database for Driver
final QuerySnapshot checkOfDriver =
await _firestore.collection('driver').where('uid', isEqualTo: _user.uid).get().catchError((error) {
print(error);
});
if (checkOfDriver.docs.isEmpty)
setState(() {
isDriver = false;
});
else
setState(() {
isDriver = true;
});
} catch (e) {
print(e);
return null;
}
}
#override
void setState(fn) {
if (mounted) {
super.setState(fn);
}
}
#override
void initState() {
super.initState();
getCurrentUser();
}
#override
Widget build(BuildContext context) {
getCurrentUser();
SizeConfig().init(context);
return _user == null
? WelcomeScreen()
: isDriver
? DriverMain()
: ClientMain();
}
}
It's actually working but not properly, because when I reload the app while I'm logging in as a Client, the app shows me DriverMain at the beginning for one second then it switches to the right side which is ClientMain and that causes me some errors sometimes, and it's not an efficient work anyway.
So, what I should add to the code or ...
Firebase already persists the users credentials, and restores them automatically when the app restarts.
But this is an asynchronous process, as it requires a call to the server. By the time your getCurrentUser = _auth.currentUser code runs, that asynchronous process hasn't finished yet, so you get null.
To properly respond to the auth state being restored (and other changes), you'll want to use an auth state change listener as shown in the documentation on authentication state:
FirebaseAuth.instance
.authStateChanges()
.listen((User? user) {
if (user == null) {
print('User is currently signed out!');
} else {
print('User is signed in!');
}
});
If you want to use this in your UI, you'll typically wrap it in a StreamBuilder instead of calling listen yourself.
I recently learned of the fabulous way of waiting for multiple async functions to complete using Future.wait([asyncFuncOne(), asyncFunctwo()])
However, I noticed two different outcomes when running either of these blocks of code. One awaiting each function to finish, the other using Future.wait for parallel processing. What am I doing wrong?
Method 1:
await msm.initProfileData();
await msm.initActivityFeed();
await msm.getRecentlyActiveUsers();
await msm.getRecommendedUsers();
await msm.getGroups();
await msm.getFollowing();
await msm.getFollowers();
Method 2:
await Future.wait([
msm.getFollowing(),
msm.initProfileData(),
msm.initActivityFeed(),
msm.getRecentlyActiveUsers(),
msm.getRecommendedUsers(),
msm.getGroups(),
msm.getFollowers(),
]);
in Method 1, all the async functions complete before my apps home screen appears. In Method 2 the home screen appears before all the async functions complete.
Cheers and thanks in advance.
EDIT: Additional code example.
#override
void initState() {
super.initState();
googleSignIn.onCurrentUserChanged.listen((account) {
handleSignIn(account);
}, onError: (err) {
print('Error signing in: $err');
});
googleSignIn.signInSilently(suppressErrors: false).then((account) {
handleSignIn(account);
}).catchError((err) {
setState(() => _showSignIn = true);
print('Error signing in: $err');
});
}
handleSignIn(GoogleSignInAccount account) async {
if (account != null) {
await createUserInFirestore();
setState(() {
isAuth = true;
});
} else {
setState(() {
isAuth = false;
_showSignIn = true;
});
}
}
createUserInFirestore() async {
final GoogleSignInAccount user = googleSignIn.currentUser;
DocumentSnapshot doc = await usersRef.document(user.id).get();
//...
//do stuff
//...
await someFunc1(); //Method1
// await comeFunc2(); //Method2
//do more stuff
}
someFunc1() async {
msm.asyncfunc1();
msm.asyncfunc2();
}
someFunc2() async {
await Future.wait([
msm.asyncFunc1(),
msm.asyncFunc2(),
]);
}
#override
Widget build(BuildContext context) {
return isAuth ? buildAuthScreen() : buildUnAuthScreen();
}
Using Future.wait(List<Future>) will wait for all the async operations without sequence as mentioned in the docs. While using await consecutively, it'll wait for the first await async operation to finish before running the next await async operation. If you have a prerequisite output before running the next async operation, it's better to use await async in sequence instead.
I am working on my first app in Flutter, I have a bit of experience with Java and js, but I never worked with flutter before so sorry if my question will seem ridiculous to you.
The app is the voice assistant chatbot, and it is supposed to perform text to speech on each new message that customer receives, my problem is that since I am using firebase messaging all of the requests that I receive are in the asynchronous call, but I need to synchronize the access to the text to speech service otherwise I run into problem of having one text interrupt another.
This is what my code looks like at the moment:
Firebase messaging:
onMessage: (Map<String, dynamic> message) {
return this.handleBotMessage(appState, message);
},
Method that desides how to handle each particular message:
Future handleBotMessage(
Store<AppState> store,
Map<String, dynamic> dataJson,
) {
#logic that convert the message into json and extracts the message type
if (type == MessageType.CHAT_MESSAGE) {
return handleChatMessage(store, subtype, messageMap);
}
}
The method that handles text messages:
Future<dynamic> handleChatMessage(
Store<AppState> store,
MessageSubtype subtype,
Map<String, dynamic> message,
) {
#Text to speach is build as a singleton and this always returns the same instance
TextToSpeech tts = TextToSpeech();
if (subtype == MessageSubtype.TEXT) {
TextMessage textMessage = TextMessage.fromJson(message);
return tts
.speak(textMessage.text)
.then((result) => store.dispatch(NewBotMessageAction(textMessage)));
} else if (subtype == MessageSubtype.QUICK_REPLY) {
QuickReplyMessage qrMessage = QuickReplyMessage.fromJson(message);
return tts
.speak(qrMessage.text)
.then((result) => store.dispatch(NewQrOptionsAction(qrMessage)));
} else {
throw new Exception('Unexpected message subtype!');
}
}
The method that actually performs the text to speech
Future<dynamic> speak(String text) async {
return flutterTts.speak(text).then((resp) {
ttsRunning = false;
print(resp);
return resp;
}, onError: (obj, st) {
ttsRunning = false;
print(obj);
print(st.toString());
});
}
Text to speech initialization
Future init() async {
await flutterTts.setLanguage("en-US");
var res = await flutterTts.isLanguageAvailable("en-US");
print(res);
return res;
}
https://pub.dev/packages/flutter_tts
Ok, I have found the solution, the issue was as frank06 pointed out with the fact that flutter tts completes the future immediately rather than after the whole phrase was spoken.
So here is my solution, it is not perfect, but it works:
Completer completer;
Future<dynamic> speak(String text) {
print('Started speeking');
print(new DateTime.now().toIso8601String());
if (TextToSpeech.lastRequest == null) {
lastRequest = _executeSpeech(text);
} else {
lastRequest = lastRequest.then((resp) {
return _executeSpeech(text);
});
}
return lastRequest;
}
Future<dynamic> _executeSpeech(String text) {
completer = Completer();
flutterTts.speak(text).then((resp) {
ttsRunning = false;
print(resp);
return resp;
}, onError: (obj, st) {
ttsRunning = false;
print(obj);
print(st.toString());
});
return completer.future;
}
flutterTts.setCompletionHandler(() {
print('Finished speeking');
print(new DateTime.now().toIso8601String());
ttsState = TtsState.stopped;
completer.complete(ttsState);
});
flutterTts.setErrorHandler((msg) {
ttsState = TtsState.stopped;
completer.complete(ttsState);
});
If you don't want new messages interrupting those being spoken, you can queue them up. This way the new messages will wait for the current message to finish. Check out this approach:
Queue of Future in dart