CODEWITHSUNDEEP
flutterdartexceptiontry-catchflutter-http
Nikhil kumar
Nikhil kumar

Reputation: 611

Flutter http exception not throw on another try catch block

I get into this weird exception which keeps on coming and freezing my app.
I am try to handle SocketException and TimeOutException in http package with provider package.

class Auth with ChangeNotifier{
..........
Future<User> getUser(String id) async {
try {
final user = (await http.post("${Domain.ADDRESS}/user",
      headers: {"auth-token": _token}, body: {"userId": id}))
  .body;
 } on SocketException {
 throw HttpException("DISCONNECTED");
 } on TimeoutException {
 throw HttpException("TIMEOUT");
}  catch (error) {
 print(error);
  throw HttpException("SOMETHING_WENT_WRONG");
  }
 notifyListeners();
 return userdata;
 }
   ......
 }

when internet in not connected application freezing at

on SocketException {
throw HttpException("DISCONNECTED");  <------------ Exception has occurred.
                                                  HttpException (DISCONNECTED)

But I handle this on next screen

 @override
  Future<void> didChangeDependencies() async {
 ......

 setState(() {
 isLoading = true;
 });
 try{
   user= await Provider.of<Auth>(context)
  .getUser(Provider.of<Auth>(context).userId);
 if (this.mounted) {
  setState(() {
    isLoading = false;
  });
    }
 
    }on HttpException catch(error){
    if(error.toString().contains("DISCONNECTED")){
        Scaffold.of(context).showSnackBar(SnackBar(content: Text("Please check your internet 
 connection"),));
    }
   }catch(error){
     print(error);
   }
  super.didChangeDependencies();
}

Custom HttpException.dart

class HttpException implements Exception {
final String message;
HttpException(this.message);
@override
String toString() {
return message;
}
}

Upvotes: 1

Views: 1403

Answers (2)

Noah S.
Noah S.

Reputation: 116

So if I understand you right, your IDE pauses when the exception is thrown, even though you catch it correctly.

Can you tell me what happens after resuming / unpausing the IDE that you're using, does it behave as expected and print this?

if(error.toString().contains("DISCONNECTED")){
        Scaffold.of(context).showSnackBar(SnackBar(content: Text("Please check your internet 
 connection"),));

Because if it does, that means that you probably have the Breakpoints setting on All Exceptions and not only Uncaught Exceptions.

Image of visual code run tab

Upvotes: 3

Noah S.
Noah S.

Reputation: 116

I also had this problem and I found out that it was due to a bugged flutter beta/dev version that I had.

Solution
I fixed it by changing the channel to stable and upgrading to the newest version.

flutter channel stable
flutter upgrade

If you want, you can also change the channel to master to have the newest features of flutter. But I would really suggest using the stable channel, since it is more stable and beacause a new stable build was just recently released.

Here's a link to the issue that you're encountering:
https://github.com/flutter/flutter/issues/66488

Upvotes: 0

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