Difference between contentResolver and ContentObserver
<p>I am developing an Android application that receives MMS and I read a lot of code.  And there is contentResolver and ContentObserver, but I do not get what is the difference between them</p>

<p>Like this statement:</p>

<p><code>contentResolver.registerContentObserver(Uri.parse("content://mms-sms"), true, mmsObserver);</code></p>

<p><code>contentResolver.unregisterContentObserver(mmsObserver);</code></p>

<p>What is the difference between contentResolver and ContentObserver and what do they have to do with receiving MMS?</p>
