CODEWITHSUNDEEP
firebasedartfluttergoogle-cloud-firestore
Norbert
Norbert

Reputation: 7750

flutter app crash when there is low or no network connection

I have this IconButton which when I press it updates a field on my cloud Firestore DB.I do not get any problem if there is a healthy internet connection, how ever is there is no network or low signal I get a timed out error and this causes the app to crash. I have have wraped the function in a try{} catch{} block but still that doesn't help.

 onPressed: (){
                 try{
                  Firestore.instance.runTransaction((Transaction thistransaction)async{
                  DocumentSnapshot docSnapshot = await thistransaction
                  .get(snapshotDocuments[index].reference);
                  await thistransaction.update(docSnapshot.reference,
                   {'voteUpBool':!docSnapshot['voteUpBool']});

                  });
                }
                 catch(err){
                    print(err.toString());
                  }
                 },

Upvotes: 2

Views: 2454

Answers (2)

Matt Booth
Matt Booth

Reputation: 2063

We apply a '.timeout' to update calls as per below. Apply it to the end of your update.

collection.doc(docId)
 .update({fieldName: fieldValue})
 .timeout(const Duration(seconds: 5), 
    onTimeout: () => throw CustomTimeoutException);

You can throw a plain Exception or define your own timeout exception, and then just use the catch block as usual. Note that we also use a general connection test across our whole app (as per the other answer) aswell.

Upvotes: 0

Viren V Varasadiya
Viren V Varasadiya

Reputation: 27177

you have to check internet or wifi available or not for that just add connectivity: ^0.3.1 dependency with latest version and follow the below code.

import 'dart:io';
...
try {
   final result = await InternetAddress.lookup('google.com');
   if (result.isNotEmpty && result[0].rawAddress.isNotEmpty) {
       print('connected');
   }
 } on SocketException catch (_) {
    print('not connected');
 }

Upvotes: 2

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