My Android app interacts with a card reader via the audio jack, which requires the volume to be turned all the way up. When the volume is increased, users see the following message:
Listening at a high volume for a long time may damage your hearing. Tap OK to allow the volume to be increased above safe levels.
This message is confusing users because they aren't listening to anything at all. The audio is being used as a data communication channel. I understand you can eliminate this message on a rooted device, but is there anything that can be done on regular non-rooted devices?