IntentService Souces: https://www.youtube.com/watch?v=n6hwehPazac&list=PLQkwcJG4YTCTq1raTb5iMuxnEB06J1VHX https://www.youtube.com/watch?v=EwwB_wZhBaw&list=PLQkwcJG4YTCTq1raTb5iMuxnEB06J1VHX