title: Android: what's the meaning of exported receiver's attribute?
body: <pre><code>   &lt;receiver
          android:name="MyReceiver"
          android:enabled="true"
          android:exported="true"&gt;
          &lt;intent-filter&gt;
              &lt;action android:name="android.net.conn.CONNECTIVITY_CHANGE" /&gt;
              &lt;action android:name="android.intent.action.BOOT_COMPLETED" /&gt;
          &lt;/intent-filter&gt;  
    &lt;/receiver&gt;
  </code></pre>
  
  <p>I don't understand if it's needed to be notified.
  If it were true any app could call my receiver with those actions? So If I make it false the system can send the actions to my receiver?</p>