Android Tutorial

Software Setup and Configuration

Android Studio

File Structure

Components

Core Topics

Layout

View

Button

Intent and Intent Filters

Toast

RecyclerView

Fragments

Adapters

Other UI Component

Image Loading Libraries

Date and Time

Material Design

Bars

Working with Google Maps

Chart

Animation

Database

Advance Android

Jetpack

Architecture

App Publish

App Monetization

How to use Firebase UI Authentication Library in Android?

Firebase UI is a library that provides pre-built UI flows for using Firebase Authentication. It supports multiple authentication methods, including email/password, Google, Facebook, and more. Here's a step-by-step guide on how to use Firebase UI Authentication in your Android app:

1. Setup Firebase in Your Android Project:

If you haven't already, add Firebase to your Android project. You can do this through the Firebase console and by connecting your app using the Firebase Assistant in Android Studio.

2. Add Dependencies:

In your app-level build.gradle file, add the necessary dependencies:

// Firebase UI Auth
implementation 'com.firebaseui:firebase-ui-auth:7.2.0' // Check for the latest version

// Required only if you are using Google Sign-In
implementation 'com.google.android.gms:play-services-auth:19.2.0'

Then, sync your project.

3. Configure Auth Providers:

Before starting the auth process, you need to configure the providers you want to use. For example, for email/password and Google sign-in:

val providers = arrayListOf(
    AuthUI.IdpConfig.EmailBuilder().build(),
    AuthUI.IdpConfig.GoogleBuilder().build()
    // You can add other providers like Facebook, Twitter, etc.
)

4. Start the Auth Intent:

val RC_SIGN_IN = 123

startActivityForResult(
    AuthUI.getInstance()
        .createSignInIntentBuilder()
        .setAvailableProviders(providers)
        .build(),
    RC_SIGN_IN
)

5. Handle the Auth Response:

In your onActivityResult method, handle the result of the authentication:

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    if (requestCode == RC_SIGN_IN) {
        val response = IdpResponse.fromResultIntent(data)
        if (resultCode == Activity.RESULT_OK) {
            // Successfully signed in
            val user = FirebaseAuth.getInstance().currentUser
            // ...
        } else {
            // Sign in failed
            Log.e(TAG, "Sign in failed: ${response?.error?.errorCode}")
        }
    }
}

6. Sign Out:

Using Firebase UI, signing out is straightforward:

AuthUI.getInstance()
    .signOut(this)
    .addOnCompleteListener {
        // User is now signed out
    }

7. Customization:

Firebase UI is highly customizable. You can set custom themes, logos, and terms of service URLs, among other things:

.startSignInIntent(
    AuthUI.getInstance()
        .createSignInIntentBuilder()
        .setAvailableProviders(providers)
        .setLogo(R.drawable.your_logo) // Your logo
        .setTheme(R.style.YourTheme)   // Your theme
        .build(),
    RC_SIGN_IN
)

8. Advanced:

Firebase UI also supports advanced features like:

Email link authentication
SmartLock for Passwords
Phone authentication

Ensure you refer to the Firebase UI documentation for more details on these features and how to implement them.

Lastly, always remember to set up Firebase Auth in the Firebase Console and enable the providers (e.g., email/password, Google) you want to use.

How to integrate Firebase UI Authentication library in Android:

To integrate Firebase UI Authentication library, add the following dependency in your app's build.gradle file:

implementation 'com.firebaseui:firebase-ui-auth:8.0.0'

After adding the dependency, initialize Firebase Authentication in your app and configure the Firebase UI Authentication:

// Initialize Firebase Authentication
FirebaseAuth auth = FirebaseAuth.getInstance();

// Set up Firebase UI Authentication
AuthUI authUI = AuthUI.getInstance()
        .createSignInIntentBuilder()
        .setAvailableProviders(Arrays.asList(
                new AuthUI.IdpConfig.EmailBuilder().build(),
                new AuthUI.IdpConfig.GoogleBuilder().build(),
                // Add additional authentication providers as needed
        ))
        .build();

// Start Firebase UI Authentication flow
startActivityForResult(authUI, RC_SIGN_IN);

Android Firebase Authentication UI example code:

In your activity, you'll typically use startActivityForResult to launch the Firebase UI Authentication flow. Handle the result in onActivityResult:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == RC_SIGN_IN) {
        if (resultCode == RESULT_OK) {
            // Successfully signed in
            FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
        } else {
            // Sign in failed
            // Handle the failure
        }
    }
}

Customizing Firebase Authentication UI in Android app:
Firebase UI Authentication library allows customization of the authentication UI. You can customize the logo, theme, and additional features. For example, you can customize the theme:
```
AuthUI authUI = AuthUI.getInstance()
        .createSignInIntentBuilder()
        .setTheme(R.style.CustomTheme)
        .build();
```

Handling user authentication with Firebase UI in Android development:

Once the user is authenticated, you can access the FirebaseUser object to get information about the authenticated user:

FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null) {
    String uid = user.getUid();
    String displayName = user.getDisplayName();
    String email = user.getEmail();
    // ...
}