title: How to modify expo android styles.xml in react native app
body: <p>As many others before me, I'm looking for the way to customize expo android's theme colors and styles <strong>in order to customize native components styles like DatePicker.</strong></p>
  
  <p>I found a <a href="https://stackoverflow.com/questions/38976064/how-to-style-the-react-native-picker-using-android-styles-xml">lot</a> <a href="https://github.com/facebook/react-native/issues/9430" rel="nofollow noreferrer">of</a> <a href="https://stackoverflow.com/questions/38921492/how-to-style-the-standard-react-native-android-picker/39141949#39141949">posts</a> explaining the same old thing: "Update your style the native android way!"</p>
  
  <p>Ok then, but my React native project doesn't have any "res/values/styles.xml" and so on. <strong>Creating them from scratch has no effect.</strong></p>
  
  <p>There's one step that I'm deadly missing here, but which one?</p>
  
  <p>My repo looks a bit like this actually:</p>
  
  <pre><code>.expo
  /* a bunch of folders containing my custom js */
  App.js
  app.json
  babel.config.js
  package.json
  package-lock.json
  </code></pre>