Where to get detail description on understanding android
<p>I found lots of books on android which give basic concept on android Example (calling Activity, Intent, service, broadcast receivers etc). But I want to know brief description on all these concept. in os level or in api level how does it work. Also how connection with wifi or 3g works in api level. </p>

<p>I want to know brief understanding on android. Can anyone suggest any tutorial or book to get detail understanding on android.</p>

<p>Thanks</p>
