title: Change navigation bar on android with RN with expo?
body: <p>I started using React Native with Expo and I encountered my first problem. I want to change the color of the navigation bar on Android. Unfortunately, I can't figure out how to do that.</p>
  <img src="https://i.stack.imgur.com/02124.png" height="550">
  <p>I tried to use <a href="https://github.com/thebylito/react-native-navigation-bar-color#readme" rel="noreferrer">https://github.com/thebylito/react-native-navigation-bar-color#readme</a> but it prints out the following error:</p>
  <blockquote>
  <p>TypeError: TypeError: null is not an object (evaluating 'NavigationBarColor.changeNavigationBarColor')</p>
  </blockquote>
  <pre class="lang-js prettyprint-override"><code>if (Platform.OS == 'android') {
    changeNavigationBarColor('#f00', true);
  }
  </code></pre>