I am making an android application in which I have to answer the call and then I want to play pre-recorded audio so that the person calling will hear this.
Is there any API or any library which can I use for this? Can we do it through text-to-speech ?
Thank you
It is not possible to play audio during call in Android device.
Note: You can play back the audio data only to the standard output device. Currently, that is the mobile device speaker or a Bluetooth headset. You cannot play sound files in the conversation audio during a call.
Link to android documentation
https://developer.android.com/guide/topics/media/mediaplayer
For more information
How to play an audio file on a voice call in android
