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Proof of concept

Bluetooth MIC Recording

Long-running Bluetooth headset recording on Android

A .NET MAUI proof of concept: multi-hour microphone recording from a Bluetooth headset, kept alive by a foreground service, notification actions, and a battery-optimization exemption.

C#
GitHub

Abstract

BtRecorderPoc is a MAUI Android proof of concept for long-running headset-mic recording. Recording is controlled from a notification action. A foreground service, wake lock, and battery-optimization exemption keep the pipeline alive for multi-hour sessions.

Problem

Android will kill background recording. Bluetooth SCO routing, notification dismissal, and battery savers make 'press record and walk away' unreliable.

Solution

Start a microphone foreground service at process launch. Show a silent keep-alive notification always, and a control notification only while a BT device is connected.

Architecture

  • MainApplication.OnCreate starts BtRecorderService.
  • BluetoothStateReceiver shows/hides the control notification on ACL connect/disconnect.
  • Notification-only Start/Stop; UI has no record button.

Capabilities

  • Notification-only Start/Stop.
  • Auto-stop on Bluetooth disconnect.
  • Battery-optimization exemption prompt.
  • In-app playback with seek.

Audience

MAUI/Android engineers who need headset capture that outlives the activity.

Outcomes

  • A documented pattern for microphone foreground services on modern Android.
  • Separation of keep-alive versus user control notifications.

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