title: How to securely store API keys in Flutter?
body: <p>I'm using the <a href="https://pub.dev/packages/googleapis" rel="noreferrer">googleapi</a>'s Flutter package and to use the Google Drive API, I need to put in credentials. My question is, how can I securely store them in my app so when I publish my app, they can't be taken. I found a cool package, <a href="https://pub.dev/packages/flutter_secure_storage" rel="noreferrer">flutter_secure_storage</a> but to use it, I need to put all of my values into the secure storage. So how can I do that? I was thinking of using something like <a href="https://medium.com/flutter-community/use-environment-variables-in-ci-cd-for-flutter-apps-cbd6d9ac82c" rel="noreferrer">this</a>, but I'm not sure. It would be great if someone could put me in the right direction as to how to do this by the book so to speak.</p>
  
  <p>To further explain, I don't want to have my sensitive information in a file such as <code>main.dart</code> as a variable to put into storage (if it isn't there already).</p>