We are the developers of an audio recorder app for Android - available on Google Play store at:
$1The app is very blind friendly - in that it was designed with extensive feedback from blind users.
The app and it's interface is TalkBack friendly (TalkBack is one of the screen readers for Android - others like Shine Plus will work just as well).
The newest update has some additional controls - so now you can control recording just with the Power button.
If you have a Samsung or a Nexus phone and some others - then you also have a call recorder that seamlessly works with the audio recorder.
The app is free, without any advertisements. WAV and OGG support is free. MP3 is paid. The Call Recorder is completely free for TalkBack and screen reader users.
The app includes some field recording features as well - like earphone monitoring while recording, and real-time effects which are all free.
App has been tested recording continuously for 100 hours - which creates a 2.4GB file with MP3 compression. It recorded about 34 hours on a single charge on a Samsung Galaxy Note 4.
If anyone has any questions, let me know.