Hi @duytq94

Can you please advise how can we add the message notifications using the firebase messaging? I guess it will get the messages we store right?

does not load further page after pressing "Sign in with google". onPressed "Sign in with google does not work out and thus does not move to next page.....?

Why cant i run the project ?

E/flutter ( 7521): [ERROR:flutter/shell/common/engine.cc(149)] Could not prepare to run the isolate. E/flutter ( 7521): [ERROR:flutter/shell/common/engine.cc(114)] Engine not prepare and launch isolate. E/flutter ( 7521): [ERROR:flutter/shell/platform/android/android_shell_holder.cc(136)] Could not launch engine in configuration.

the error message

Hi,

I wanted to highlight an issue. The way group id is being generated doesn't guarantees uniqueness when same chat app is opened in two different platforms. Code reference: https://github.com/duytq94/flutter-chat-demo/blob/c6ef5ba16ef02392b8bb2dd4f775bb4eb32858a2/lib/pages/chat_page.dart#L98

I've tested it in flutter-android and flutter-web platform and following are the different hascodes it generates:

Android:
myId hashCode: 796431288
peerId hashCode: 871147166
generated groupId: qe7zrSoyJuPH4mf6uxpXwr5jRF33-QwodOOpFVVQAFWabU02IBxXiirV2

Web:
myId hashCode: 246537070
peerId hashCode: 58733319
generated groupId: QwodOOpFVVQAFWabU02IBxXiirV2-qe7zrSoyJuPH4mf6uxpXwr5jRF33

Because of this user is not able to see the chat messages generated from different platform.

Thank you, Kartik

Hi, Thanks for putting up this great project. I'm a bit new to flutter(mobile app development) and seeing your project a bit surprised that you're not using any external package for state management. Like I've seen most people are using provider or redux or BLOC to decouple network logic from UI. And in this project most Firebase functionality is coupled with UI. So, for a project which is supposed to scale what is the recommended way? Is the design which you've chosen is good for large scale apps too? Or are there any caveats?

Uploaded images doesn't seem to show at the frontend simply at the Users end, but it does show at backend(firebase storage). Any thought why that's happening?

Hi,

How can I get the uploaded image?

Basically I don't know how to get that specific image we uploaded (using the time since epoch) and delete it..

With text is easy but on firestorage I'm not being able, please advise and thank you.

Very good demo!

When I send a chat message, I got the below error.

java.lang.RuntimeException: An error occurred while executing doInBackground() at android.os.AsyncTask$4.done(AsyncTask.java:399) at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383) at java.util.concurrent.FutureTask.setException(FutureTask.java:252) at java.util.concurrent.FutureTask.run(FutureTask.java:271) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:289) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) at java.lang.Thread.run(Thread.java:919)

Caused by: java.lang.AssertionError: INTERNAL ASSERTION FAILED: A transaction object cannot be used after its update callback has been invoked. at com.google.firebase.firestore.util.Assert.fail(com.google.firebase:firebase-firestore@@21.3.0:46) at com.google.firebase.firestore.util.Assert.hardAssert(com.google.firebase:firebase-firestore@@21.3.0:31) at com.google.firebase.firestore.core.Transaction.ensureCommitNotCalled(com.google.firebase:firebase-firestore@@21.3.0:246) at com.google.firebase.firestore.core.Transaction.write(com.google.firebase:firebase-firestore@@21.3.0:241) at com.google.firebase.firestore.core.Transaction.set(com.google.firebase:firebase-firestore@@21.3.0:105) at com.google.firebase.firestore.Transaction.set(com.google.firebase:firebase-firestore@@21.3.0:91) at com.google.firebase.firestore.Transaction.set(com.google.firebase:firebase-firestore@@21.3.0:67) at io.flutter.plugins.firebase.cloudfirestore.CloudFirestorePlugin$7.doInBackground(CloudFirestorePlugin.java:688) at io.flutter.plugins.firebase.cloudfirestore.CloudFirestorePlugin$7.doInBackground(CloudFirestorePlugin.java:682) at android.os.AsyncTask$3.call(AsyncTask.java:378) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:289)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)  at java.lang.Thread.run(Thread.java:919) 

Hi, I want to know the best possible way to implement message delivery report (like delivered, seen) which will be shown to sender for every message.
Please provide me an idea what I have to do in firestore and in client (user) side.

Hi @duytq94

I have an issue and I need your help.

Notifications work nice BUT if you login with another user you will still get notified of that other user.

For example you login with A and logout, if you send a message from B to A, you will get both. In my case I'm using the same notification to display add requests.

Can you advise please?

I tried this on logout but don't work:

final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = new FlutterLocalNotificationsPlugin();
    await flutterLocalNotificationsPlugin.cancelAll();

D/Surface ( 6720): Surface::disconnect(this=0x713117a000,api=1) E/flutter ( 6720): [ERROR:flutter/shell/common/shell.cc(184)] Dart Error: Unhandled exception: E/flutter ( 6720): PlatformException(sign_in_failed, com.google.android.gms.common.api.ApiException: 12500: , null) D/WindowClient( 6720): Remove from mViews: DecorView@5e372b2[SignInHubActivity], this = android.view.WindowManagerGlobal@c0f268f

console messages

Hi , the demo works out of the box perfectly, but when we change the google plist in iOS it crashes on clicking sign on button.

Is there any specific thing to do or seed the database on my firebase account initially to start using the app ?

You could achieve this by adding a diffie-hellman key exchange. I would advise changing the generated key every couple of messages for extra security.

Hello, I created a chat application using your code and used the firebase function but there is no notification when you send a message to each other. I get an error "Cannot find pushToken" on the console. How Can I Solve This?

Hi,

i am making groupchat id like this. if (currentUserId.hashCode <= peerId.hashCode) { groupChatId = '$currentUserName-$peerName'; } else { groupChatId = '$peerName-$currentUserName'; }

I want to delete entire chat history for user one side, not for both ends. Eg. I am current user, i want to delete my history only, not peer user history like whatsapp. If i use delete method, it will delete entire coversation of both ends. But i need only from my end, keeping at peer user conversation.

How can i acheive it ? Please help me on this.