Audio to default input of android apps

Description : Create an application for android that will send an audio file to the audio input of all other applications. The application must replace the default microphone audio input of android. Example 1: via created application I will be able to send any audio file to Sound Hound app and Sound Hound must recognize the song. Example 2: via created application I can send an audio file to the standard Voice Recorder. Thus, new voice recording will be created with the same audio as if it did come from the microphone of my android. Validation: I must be able to test such application on any android (real or emulated one). Provide a well documented code. Document with examples how to reuse your code for other developers. Provide a GUI interface for selecting an audio file for validation of your app. Provide an API interface for using your app or library from other apps (with short examples). Your app will be tested on a real android and on an emulated one. Emulated android version is of [login to view URL] project running on VM VirtualBox with root access. The real android does not have root access. Document must explain how ti run/install the app to do the tests and validate the project. Project can be considered completed, when it is tested and is validated according to criteria provided in the description of the project.