Implementing password authentication on Android

To make things easier in terms of Android, we're going to use the awesome Firebase Auth UI. Using the Firebase Auth UI will save a lot of hassle when it comes to building the actual user interface and handling the different intent calls between the application activities. Let's see how we can integrate and use it for our needs.

Getting ready 

Let's start first by configuring our project and downloading all the necessary dependencies. Head to your build.gradle file and copy/paste the following entry:

     compile 'com.firebaseui:firebase-ui-auth:3.0.0'

Now, simply sync and you will be good to start.

How to do it...

Now, let's see how we can make the functionality work:

1. Declare the FirebaseAuth reference, plus add another variable that we will need later on:

     FirebaseAuth auth; 
     private static final int RC_SIGN_IN = 17;

2. Now, inside your onCreate method, add the following code:

     auth = FirebaseAuth.getInstance();
      if(auth.getCurrentUser...