Build a Flutter Audio App: Player and Recorder Tutorial

Unlock the Power of Audio in Your Flutter App

In today’s digital landscape, audio recording and playback have become essential features in many modern apps. From note-taking and language learning to podcasting and gaming, the ability to record and play audio has revolutionized the way we interact with technology. In this tutorial, we’ll explore how to add these features to a Flutter app, empowering you to create your own innovative audio-based applications.

Getting Started

Before we dive in, ensure you have the following:

• Flutter installed
• Android Studio or Xcode installed
• A new Flutter app created with the command flutter create my_app

Setting Up the App

Open your newly created Flutter app in your preferred code editor and navigate to main.dart. Remove the debug mode banner by setting debugShowCheckedModeBanner to false. All our code will be inside the MyHomePageState class.

Designing the UI

Let’s add a timer feature to our app, which will display the recording time. Create a Container widget with a Text widget as its child, and style the timer text using TextStyle. We’ll create a function to pass the timer into the _timerText variable later.

Next, let’s create two buttons to start and stop recording. Use a Row widget to place the buttons on the same row, and utilize Flutter’s ElevatedButton widget to create the buttons. Each button will have its own unique icon, text, and color.

Recording Audio

Create a function to start recording, which will initialize the app, open an audio session, and start recording. We’ll use the FlutterSoundRecorder package to achieve this. Inside the startRecording function, specify the directory to save the recording to, and use an if statement to check if the directory exists. If it doesn’t, create it. Then, open an audio session with the openAudioSession function and start recording.

To monitor the recording progress, use a stream to subscribe to events from the recording stream. Listen to the stream using _recordingSession.onProgress.listen, and update the timer in our app using the setState method.

Playing Audio

Create a function to play the recorded audio, which will use the assets_audio_player package. Inside the play function, use the open function to start the audio player, providing it with the path to the audio, and specifying that the audio should play automatically.

Stopping Audio

Create a function to stop the audio playback, which will use the stop method to stop the player.

Finalizing the App

With these functions in place, we’ve successfully added audio recording and playback features to our Flutter app. Below is the final code for everything we’ve built. Happy coding!

Additional Resources

• main.dart file: [insert code]
• AndroidManifest.xml file: [insert code]
• pubspec.yaml file: [insert code]

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