This is a sample project that demonstrates how to record audio on an Android device using the AudioRecord class.

The sample contains multiple Activities, each demonstrating a different scenario to keep the code easily digestable:

• AudioRecordActivity: Records PCM using the internal microphones
• BluetoothRecordActivity: Records PCM using a Bluetooth HFP device

To launch the desired Activity, change the AndroidManifest.xml accordingly.

The output is written to the device's SD card and can be downloaded from there using adb:

adb pull /sdcard/recording.pcm ~/Desktop/recording.pcm

To listen to the PCM use Audacity or a similar software. To import a PCM into Audacity use the menu File > Import > RAW data. The endianness of the PCM is usually Little Endian on Android devices (x86, ARM).

This software is licensed under the terms of the Apache License, Version 2.0.