How to play MP3 files into the microphone input - android

In a chat session, whenever I want the other person to hear a pre-recorded voice, I need to play it on my speakers and use my microphone to capture it. How can I play MP3 files into the microphone input so that whenever I do a voice chat I could play the MP3 file in such a way that I am speaking through the microphone itself?

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Play audio on microphone on Android device

I'd like to create an App that plays an audio file/stream to the microphone to allow a video communication App to capture the sound as input.
To Play the Audio I'm currently using the AudioTrack class.
The closest question is this one, but still unanswered.

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