r/flutterhelp

Would you recomend powersync or brick for offline first apps built with supabase cbeause i want to handle operations in which to users use the app offline and suddenly connect like to know what is the winning value . Also i am worried that power sync might get quite expensive so what is the best fit working with supabase.

Hello guys,
I have a question.
How do we make an app made in flutter secure?
What are the things we should look after? Or think first?
What’s the mental model we should follow?

I'm a respiratory-care professional developing a Flutter Android education app with coding assistance. I'm seeking volunteer technical guidance on making its voice assistant responsive while supporting a large domain of knowledge. I am using Grok, ChatGPT, Muse, and similar apps as examples of the conversational experience I want: quick responses, strong speech recognition, and the ability to interrupt while the assistant is talking.

I'm interested in documented architecture patterns and properly licensed code examples or reference implementations. I understand the full implementation of a commercial assistant may be private. I'm keeping my full app source private as well; this is a request for free technical advice, not paid services.

What I need help understanding:

1. For low latency, when should a Flutter app use native speech-to-speech versus a streaming speech-to-text -> LLM -> text-to-speech pipeline? How do you measure and reduce time to first audible response?
2. How do you implement reliable interruption (barge-in) while narration or an AI answer is playing? What should happen to microphone capture, VAD/turn detection, response cancellation, queued playback, and conversation context when the user interrupts?
3. How can the assistant use a large domain knowledge base without sending all its content in every prompt or making every answer slow? How would you separate model knowledge from app-specific content, and use retrieval, pre-indexing, caching, or bounded context? What is the latency/accuracy tradeoff?
4. Are there Flutter/Dart or Android examples, reusable components, or open-source projects you recommend for these patterns? Please include the relevant license and any practical limits.

There is also a concrete issue in my current implementation:

• A first spoken command opens the requested study-guide chapter and starts narration.
• In Android emulator tests, later injected commands such as "Stop," a question, or "Home" during narration do not produce the expected input/speech events.
• The capture track and RTP counters remain active with nonzero reported energy. That alone does not prove intelligible speech is reaching the recognizer.
• I have not established that the same behavior occurs on a physical device.

Current setup: Flutter/Dart Android app; flutter_webrtc pinned to 1.6.2+hotfix.3; WebRTC speech session using OpenAI Realtime; semantic VAD with application-controlled responses and speech interruption configured. Client/server configuration does not intentionally disable turn detection during narration.

What diagnostics would distinguish Android/WebRTC capture or audio-processing suppression from a provider-side VAD/event problem? Which audio source/mode, audio-focus, echo-cancellation, or emulator-input checks would you try first?

I can prepare a small sanitized reproduction and redacted diagnostics based on what would be most useful. Public replies with suggestions or relevant experience would be appreciated. Thank you.

Starting to question Flutter.

If I need to understand iOS Android anyway, why not go deep into one platform instead?

I prefer iOS so I’m considering going all in on Swift SwiftUI.

Flutter devs am I missing something?

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Hi,

So i starter creating my app with flutter flow i already did a lot like connexions sign in and more fonctionalities but now I'm blocked i need some help

I'm a Uni student and I'm looking to go into app development with Flutter, after a lot of my own research, considering it's a new language that I might just as well learn.

I want to ask for the best free resources to help me in this journey, I've done some research but some videos are all over 3 years old and I think they'll be missing some new key updates that might have been added to Flutter recently.

If anyone knows one that is up to date, I'd really appreciate it, thanks.

I made a textfield run a bunch of code on submitted. I now want to fire that same code on a different event (a button press). Should I

1. Move the code to a function outside of the widget's `build` but within the state class that can then be reused

2. Manually call the textfield's on submitted event to rerun that same code

As I write this, I think the answer is a 3rd option: move the vode to a function, but place this function within the widget's build function. Dang, have I been making a mistake putting my custom functions just outside the widget's build function?? Because if you put it within, you can use the widget context directly

I am using supabase and i don't know if i should use normal try/catch or the Either from fdpart would be a better option to handle errors.