This introductory Flutter course lets you code once for Android and iOS.

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Flutter Introduction - Android and iOS Development at Once (with Firebase)

<p>With Flutter 2.2 and Dart 2.12, we introduce two ways to deal with it.</p>
<p>1. Modify existing project to Dart version 2.7.0</p>
<p>2. Applying Null Safety</p>
<p><iframe width="560" height="314" src="https://www.youtube.com/embed/DrYpIewJ640" allowfullscreen="allowfullscreen"></iframe></p>

With Flutter 2.2 and Dart 2.12, we introduce two ways to deal with it.