Trigger an audio file when call is answered

Question

Is there a way to launch an audio file when answering a call to be played NOT into the call (so the other side could hear), but only in the call speaker (so only our side co

Answer 1

  private void PlayShortAudioFileViaAudioTrack(String filePath) throws IOException {
 // We keep temporarily filePath globally as we have only two sample sounds now..
         if (filePath == null)
             return;

 //Reading the file..
         byte[] byteData = null;
         File file = null;
         file = new File(filePath); // for ex. path= "/sdcard/samplesound.pcm" or "/sdcard/samplesound.wav"
         byteData = new byte[(int) file.length()];
         FileInputStream in = null;
         try {
             in = new FileInputStream(file);
             in.read(byteData);
             in.close();

         } catch (FileNotFoundException e) {
 // TODO Auto-generated catch block
             e.printStackTrace();
         }
 // Set and push to audio track..
         int intSize = android.media.AudioTrack.getMinBufferSize(8000, AudioFormat.CHANNEL_CONFIGURATION_MONO,
                 AudioFormat.ENCODING_PCM_8BIT);
         AudioTrack at = new AudioTrack(AudioManager.STREAM_VOICE_CALL, 8000, AudioFormat.CHANNEL_CONFIGURATION_MONO,
                 AudioFormat.ENCODING_PCM_8BIT, intSize, AudioTrack.MODE_STREAM);
         if (at != null) {
             at.play();
 // Write the byte array to the track
             at.write(byteData, 0, byteData.length);
             at.stop();
             at.release();
         } else
             Log.d("TCAudio", "audio track is not initialised ");