Working java classes which downloads video from a youtube url and convert it to mp3

I need 3 class First a class named YoutubeSyncHandler which will do this I give it multiple youtube ids in a List<String> and it will download the videos for me then another class which will convert all the downloaded videos by the given id and I also need a dummy activity which has a download progress and convert progress feedback and a pause/resume button so the progress will be like this: Main activity: I press start button It calls the YoutubeSyncHandler with some List<String> data the YoutubeSyncHandler will download the videos async and feeds back the progress of the downloading status. After download the YoutubeSyncHandler will call the YoutubeConverter and it will convert all the downloaded videos asyncronuously and saves it to the external storage as mp3. It also send progress feedback to the main activity.