title: What is the difference between Flutter Android Embedding V1 and V2
body: <p>I am working on a plugin for Flutter with background stuff.<br>
  Recently, I faced somethings about <strong>Flutter android embedding</strong> in the <a href="https://pub.dev/packages/android_alarm_manager" rel="noreferrer">android_alarm_manager</a> plugin.</p>
  
  <p>A part of the <code>README</code> says:</p>
  
  <blockquote>
    <p>For the Flutter Android Embedding V1, the background service must be provided a callback to register plugins with the background isolate.</p>
  </blockquote>
  
  <ul>
  <li>What exactly is <strong>Flutter android embedding</strong> V1 or V2?</li>
  <li>What are the differences between these two?</li>
  </ul>