# Firebase for Android (Android)

> Essential Firebase services: Authentication, Firestore, Realtime Database, Cloud Messaging, Analytics, Crashlytics, Storage, and Remote Config

- 23 interview questions
- Mid-Level
- [Interview Questions: Android](https://sharpskill.dev/en/technologies/android/interview-questions.md)

## 1. Which Firebase configuration file must be placed in the app/ folder of an Android project?

**Answer**

The google-services.json file contains all Firebase configurations (API keys, project ID, etc.) and must be placed in the app/ folder. This file is generated from the Firebase console when adding the Android app to the Firebase project.

## 2. How do you create a user account with email and password in Firebase Authentication?

**Answer**

The createUserWithEmailAndPassword() method of FirebaseAuth creates a new user account with the provided credentials. It returns a Task that, on success, contains an AuthResult with the created user's information.

## 3. How do you retrieve the currently logged-in user in Firebase Auth?

**Answer**

The currentUser property of FirebaseAuth returns the currently logged-in user as a FirebaseUser object, or null if no user is logged in. This object contains information like uid, email, displayName, photoUrl, etc.

## 20 more questions available

- What is the syntax to add a document in Cloud Firestore?
- Which Firestore method allows updating only certain fields of a document?

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