Firebase Sign In with prebuilt UI Auth

// Choose authentication providers
List<AuthUI.IdpConfig> providers = Arrays.asList(
        new AuthUI.IdpConfig.EmailBuilder().build(),
        new AuthUI.IdpConfig.PhoneBuilder().build(),
        new AuthUI.IdpConfig.GoogleBuilder().build(),
        new AuthUI.IdpConfig.FacebookBuilder().build(),
        new AuthUI.IdpConfig.TwitterBuilder().build());

// Create and launch sign-in intent
startActivityForResult(
        AuthUI.getInstance()
                .createSignInIntentBuilder()
                .setAvailableProviders(providers)
                .build(),
        RC_SIGN_IN);

---

dependencies {
    // ...

    implementation 'com.firebaseui:firebase-ui-auth:6.2.0'

    // Required only if Facebook login support is required
    // Find the latest Facebook SDK releases here: https://goo.gl/Ce5L94
    implementation 'com.facebook.android:facebook-android-sdk:4.x'

    // Required only if Twitter login support is required
    // Find the latest Twitter SDK releases here: https://goo.gl/E5wZvQ
    implementation 'com.twitter.sdk.android:twitter-core:3.x'
}