title: Android firebase authentication error in .java file
body: <p>I am trying to authenticate login and signup with Firebase. I was following this article on <a href="https://www.androidhive.info/2016/06/android-getting-started-firebase-simple-login-registration-auth/" rel="nofollow noreferrer">android hive</a> 
  but there was lot of errors, one was this,</p>
  
  <p>import com.google.firebase.auth.FirebaseAuth;</p>
  
  <p>for complete detail version of the code you can follow the above "android hive" link.</p>