https://android.jlelse.eu/create-an-android-sound-recorder-using-kotlin-36902b3bf967

The Android multimedia framework includes support for recording and playing audio. In this blog post, we’ll develop a basic Sound Recorder application that is capable of recording audio and saving it into the local storage of an Android device using the MediaRecorder that is provided by the Android SDK.

You will also learn how to request user-permissions in real-time and how to work with the local storage of an Android device.