A smooth recording flow in Flutter was a real challenge for me. Not the first tap on record. The ending.
Stop. Then whatever else the OS decides to do while you thought you were still recording — a call, a switch away from the app, the session getting paused without your UI finding out. Interruptions.
The happy path is boring. User hits record, talks, hits stop, you have a file. The product only counts if the un-happy path does not leave a ghost recording, or a stop button that does nothing, or a new recording that never starts because the last one never released.
Stop has to mean stop
I spent more time on “recording stopped” than on the recorder starting. The UI can say stopped while the plugin still holds the session. Or the session dies and the UI still thinks it is live. Either way the next tap is wrong.
I did not want a spinner that pretends everything is fine. I wanted the screen to match the actual recorder: recording, interrupted, stopped, failed. If those four get out of sync, the user will not debug your audio session for you. They will think the app is broken, because it is.
Interruptions are not edge cases
On a phone they are Tuesday. Something else wants the microphone. The app goes to background. You have to decide what the recording is at that moment: keep it, discard it, or finish it as a short file. Pretending the interruption did not happen is how you get a flow that works in a quiet room and fails in a real one.
This is separate from the later chain where a visit recording gets transcribed and summarised over the network. I wrote about that Dio sequence here: the Flutter app that had to hit the same APIs as React. That article is about order after you already have audio. This one is about still having a recording at all.
I would build the interruption and stop states first next time, then make the waveform look nice.