title: Android services explanation
body: <p>Android service is a component that is used to perform operations on the background such as playing music, handle network transactions, interacting content providers etc. <strong>It doesn't has any UI (user interface).</strong></p>
  <p>this is definition of service I read all the time. But Content provider is service and it has UI?? Am I right?</p>
  <p>Also there are 3 types of services: foreground, background and bound services</p>
  <ul>
  <li><p>Is content provider foreground service?</p>
  </li>
  <li><p>Is scheduling service background service?</p>
  </li>
  </ul>