I've read that it does not seem possible to play audio files while in a phone call. However, I'd like to have an application play a DTMF tone during a phone call. There shouldn't be any hw restriction on this as the dial pad does this already when you press one of the number keys. Instead I would like to have an application play this tone automatically without requiring the user to touch the screen. An example use case would be to recognize when the user has called their voicemail number and automatically play the tones required to enter their security code then begin listening to messages.
I've tried using the AudioManager.requestAudioFocus() to get access to the voice call stream (AudioManager.STREAM_VOICE_CALL) but it always returns REQUEST_FAILED. I can play the tone using ToneGenerator without requesting audio focus, but it doesn't play over the voice call just over the headset speaker. Any suggestions? -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
