Interview Questions.

Top 100+ Firebase Interview Questions And Answers

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Top 100+ Firebase Interview Questions And Answers

Question 1. What Is A Firebase Project?

Answer :

A assignment is a field for apps throughout iOS, Android and net. It supports sharing of features together with Database, Config and Notifications between your cross-platform apps.

You should upload iOS, Android and net app editions to a single project.

Question 2. Do I Need To Provide A Sha-1 When Adding An Android App?

Answer :

A SHA-1 is best required if you are using both Firebase Invites or Firebase Dynamic Links. Adding a SHA-1 on your assignment simplifies the Google Sign-In configuration with Firebase Authentication.

If you're no longer the use of these features, you don't should provide a SHA-1.

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Question 3. I Currently Have Both An Existing Firebase.Com App As Well As An Existing Google Project. How Do I Import Both Of Them Into A Single Firebase Project?

Answer :

You must improve your firebase.Com app into a Firebase undertaking. If you need to use Google Sign In with Firebase Authentication or Firebase Invites on your Firebase project, and you have your OAuth Client registered with some other Google mission, you can add the OAuth patron ID of your Google task to the Auth > Sign in technique > Google > Whitelist client IDs from outside tasks list.

Question 4. How Is My Firebase Console Language Determined?

Answer :

The language setting for the Firebase console is primarily based at the language selected to your Google account settings below "Account Preferences" > "Language and Input Tools".

The Firebase console is available within the following languages:

English
Brazillian Portuguese
French
German
Indonesian
Japanese
Korean
Russian
Simplified Chinese
Spanish
Traditional Chinese
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Question 5. What Roles And Permissions Does The Firebase Console Support?

Answer :

The Firebase console and Google Cloud console use the equal underlying roles and permissions. At a high-stage, those are proprietor, editor, and viewer.
A mission proprietor can upload different members to the venture, hyperlink other Google services consisting of Play/AdMob/AdWords/BigQuery and has full edit get admission to on the venture.
A venture editor has complete edit get entry to on the mission.
A project viewer has simplest study access on the task. Note that our UI currently does now not conceal/disable edit UI controls for assignment viewers, but these operations will fail for users with viewer function.
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Question 6. What Are The Prerequisites For Linking Play/admob/adwords/bigquery To My Firebase Project?

Answer :

For linking your Play account, you need to be both a Firebase venture owner and a Play account proprietor.
For linking your AdMob app, you need to be each a Firebase undertaking proprietor and an AdMob administrator.
For linking your AdWords account, you want to be each a Firebase venture proprietor and an AdWords administrator.
For linking your BigQuery venture, you want to be the Firebase venture proprietor.
Question 7. What Are The Supported Browsers For Accessing Firebase Console?

Answer :

The Firebase console may be accessed from recent variations of famous desktop browsers which include Chrome, Firefox, Safari and IE. Mobile browsers are currently not completely supported.

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Question eight. What Open Source Notices Should I Include In My App?

Answer :

On iOS, the Firebase pod incorporates a NOTICES document which includes the applicable entries.

Question nine. Why Is Firebase Analytics A Recommended Part Of Using Firebase Products?

Answer :

Firebase Analytics is a loose and limitless analytics answer that works with Firebase functions to deliver effective insights. It permits you to view occasion logs in Firebase Crash Reporting, notification effectiveness in Firebase Notifications, deep link overall performance for Firebase Dynamic Links, and in-app buy statistics from Google Play. It powers superior target audience concentrated on in Firebase Remote Config, Firebase Notifications, and more.

Firebase Analytics acts as a layer of intelligence inside the Firebase console to offer you with extra actionable insights about how to develop a high excellent app, grow your consumer base, and earn extra money.

Firebase Analytics is a part of the center Firebase SDK. Integrating Firebase Analytics is fast and clean.  

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Question 10. How Do I Segment Users Who Have Have Not Met Some Criterion?

Answer :

You can reframe the problem by using "negatively concentrated on" those users. For instance, reframe the problem as "Don't display commercials to humans who have offered something", and shape an target audience of those users to goal.

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Question eleven. How Do I Control How My Analytics Data Is Shared With Rest Of Firebase?

Answer :

By default, your Firebase Analytics statistics is used to beautify other Firebase and Google functions. You can manage how your Firebase Analytics information is shared on your challenge settings whenever. 

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Question 12. How Do I Create Closed Funnels?

Answer :

In Firebase Analytics, the Funnels web page only suggests open funnels. To create closed funnels, the occasions that the builders create must implement this. For instance, if the subsequent flows are viable:

Flow 1: Screen A, Screen B, Screen C, Screen D
Flow 2: Screen X, Screen Y, Screen C, Screen D

You ought to log the subsequent occasions :

Flow 1 → A, B, C_1, D_1
Flow 2 → X, Y, C_2, D_2

Each set of those creates a closed funnel in Firebase Analytics. You can then create an target audience of customers who log all occasions in every Flow.

IPHONE APPS Interview Questions
Question 13. Why Are There Fewer Crash Reports In Analytics Than Crash Reporting?

Answer :

Crash Reporting creates a separate heritage process to upload crash data. If your app extends the Android Application elegance, you ought to ensure it's miles multi-method secure. Otherwise, it may cause concurrency problems. When an app extends an Application item, this item receives instantiated for each procedure in a multi-method app. Consider the following while including Crash Reporting to your app:

If the implementation of this object accesses any out-of-system nation (a database, the file machine, shared alternatives, and so on), or plays different moves no longer secure for a multi-method surroundings, concurrency troubles might arise. This is due to the fact a couple of times of the Application item may also run concurrently.

Many third-birthday party libraries keep out-of-method country (e.G. In a local database) and are difficulty to the identical concurrency problems if they are initialized from the Application item. If your app fits this description and you intend to apply Crash Reporting to your app, we strongly encourage you to don't forget transferring the Application logic to Content Providers, or to Android Activities. Any Application logic that isn't secure for a multi-manner surroundings can have unintended results for your app.

Crash Reporting routinely exports captured errors to Firebase Analytics as app_exception events. Currently on Android, you may see a big discrepancy between the quantity of Crash Reporting errors and Analytics app_exception activities.

Question 14. Do I Need To Use Other Firebase Services In Order To Use Fcm?

Answer :

You can use Firebase Cloud Messaging as a standalone issue, in the same way as you probably did with GCM, with out the use of other Firebase offerings.

Question 15. I Am An Existing Google Cloud Messaging (gcm) Developer. Should I Move To Firebase Cloud Messaging?

Answer :

FCM is the new edition of GCM underneath the Firebase emblem. It inherits GCM’s center infrastructure, with new SDKs to make Cloud Messaging improvement less difficult.

Benefits of upgrading to FCM SDK consist of:

Simpler patron development. You not need to write your own registration or subscription retry logic.

An out-of-the-box notification solution. You can use Firebase Notifications, a serverless notifications answer with a web console that we could all and sundry send notifications to target precise audiences based on Firebase Analytics insights.

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Question sixteen. Why Do My Targeted Devices Apparently Fail To Receive Messages?

Answer :

When it looks as if devices have not successfully received messages, check first for these two capability reasons:

Foreground message dealing with for notification messages. Client apps want to add message dealing with logic to handle notification messages while the app is in the foreground at the tool. See the info for iOS and Android.

Network firewall regulations. If your organization has a firewall that restricts the site visitors to or from the Internet, you need to configure it to allow connectivity with FCM in order on your Firebase Cloud Messaging patron apps to receive messages. The ports to open are:

5228
5229
5230
FCM typically uses 5228, but it on occasion uses 5229 and 5230. FCM does now not provide particular IPs, so you ought to permit your firewall to accept outgoing connections to all IP addresses contained inside the IP blocks listed in Google's ASN of 15169.

Question 17. I Have Implemented Onmessagereceived In My Android App, But It Is Not Being Called.?

Answer :

When your app is within the historical past, notification messages are displayed within the device tray, and onMessageReceived is not referred to as. For notification messages with a facts payload, the notification message is displayed within the machine tray, and the information that became included with the notification message can be retrieved from the rationale launched whilst the consumer taps on the notification.

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Question 18. Why Was My Realtime Database Reported Bandwidth Lower Than Average Between September 2016 And March 2017?

Answer :

For our bandwidth calculations, we commonly include SSL encryption overhead (based totally on layer five of the OSI model). However, in September 2016, we delivered a worm that caused our bandwidth reporting to disregard encryption overhead. This might have resulted in artificially low suggested bandwidth and bills to your account for some months.

We released a fix for the worm in late March 2017, returning bandwidth reporting and billing to their everyday stages.

Database Interview Questions
Question 19. What Are The Scaling Limitations Of The Realtime Database?

Answer :

Each Realtime Database instance has limits at the wide variety of write operations in line with 2nd. For small writes, this restriction is approximately one thousand write operations according to second. In addition, each database example has a cap on the number of simultaneous database connections.

Our default limits are massive sufficient for most applications. If you're building an app that requires additional scale, we suggest monitoring your utilization over time and contacting us if you get near those limits. In some instances, we might also want to shard your application across multiple database times for introduced scale.

Question 20. What Can I Do If I'm Over My Real Time Database Usage Limits?

Answer :

If you've received an email alert or notification inside the Firebase console which you've handed your Realtime Database usage limits, you can cope with it primarily based at the utilization restriction you have exceeded. To see your Realtime Database usage, visit the Realtime Database usage segment of the Firebase console.

If you're over your down load restriction, you may improve your Firebase plan or wait until your download restrict resets on the begin of your subsequent billing cycle. To lower your downloads, try the following steps:

Add queries to limit the records that your concentrate operations return.
Check for unindexed queries.
Use listeners that only down load updates to facts — for example, on() instead of once().
Use protection rules to dam unauthorized downloads.
If you're over your storage restriction, improve your plan to keep away from provider disruptions. To lessen the amount of records in your database, strive the subsequent steps:

Run periodic cleanup jobs.
Reduce any reproduction records in your database.
Note that it is able to take the time to see any facts deletions pondered in your storage allotment.

If you're over your simultaneous database connections limit, upgrade your plan to avoid any service disruptions. To manage simultaneous connections in your database, attempt connecting via users through the REST API in the event that they do not require a realtime connection.

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Question 21. Why Can't I Use Cloud Storage?

Answer :

Firebase Storage creates a default bucket inside the Google App Engine loose tier. This permits you to fast get up and jogging with Firebase and Firebase Storage, while not having to put in a credit score card or permit a billing account. It additionally permits you to easily proportion facts between Firebase and a Google Cloud Platform challenge.

There are, but, two regarded instances in which this bucket can't be created and you'll be unable to apply Firebase Storage:

A task imported from Google Cloud Platform which had a Google App Engine Master/Slave Datastore utility.

A undertaking imported from Google Cloud Platform which has domain prefixed initiatives. For instance: area.Com:mission-1234.

There are currently no workarounds to those issues, and we suggest that you create a brand new project inside the Firebase console and allow Firebase Storage in that venture.

Question 22. Why Don't Fetched Values Change The Behavior And Appearance Of My App?

Answer :

When your app fetches parameter values from the Remote Config service, the ones values are cached domestically but now not activated. To spark off fetched values so as to take impact, name activateFetched. This layout lets you manage while the behavior and look of your app changes, because you can pick when to call activateFetched. After you call activateFetched, your app supply code determines while updated parameter values are used.

For example, you may fetch values and then set off them the next time a consumer starts your app, which removes the need to delay app startup at the same time as your app waits for fetched values from the provider. Changes to your app's conduct and look then arise while your app uses the up to date parameter values.

Question 23. How Quickly Does The Remote Config Service Return Fetched Values After My App Sends A Fetch Request?

Answer :

Devices generally acquire fetched values in less than a 2d, and often obtain fetched values in milliseconds. The Remote Config provider handles fetch requests inside milliseconds, but the time required to complete a fetch request will rely upon the community velocity of the device and the latency of the network connection utilized by the tool.

If your aim is to make fetched values take effect to your app as soon as feasible, but without developing a jarring person experience, consider adding calls to activateFetched on every occasion that your app does a full screen refresh.

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Question 24. Why Does My Android App Access Each Dynamic Link Twice?

Answer :

The getInvitation API clears the saved Dynamic Link to prevent it from being accessed twice. Be positive to name this API with the autoLaunchDeepLink parameter set to false in every of the deep link sports to clean it for the case when the pastime is brought about outdoor the main activity.

Mobile Testing Interview Questions
Question 25. I Am An Existing Google Cloud Messaging (gcm) Developer, And I Want To Use Firebase Notifications. What Should I Do?

Answer :

Firebase Notifications is an out-of-the-container answer that lets every body send notifications to target specific audiences based totally on Firebase Analytics insights. Also, Firebase Notifications gives funnel evaluation for every message, allowing clean evaluation of notification effectiveness. 

If you are an present GCM developer, to use Firebase Notifications you need to upgrade from GCM SDKs to FCM SDKs. See the courses for migrating Android and iOS apps.

Question 26. Can Google Search Index Multiple Languages For A Single App?

Answer :

Google Search supports the following multi-language cases:

The related internet site has precise URLs for each language, and there may be one corresponding app HTTP URL for every web URL.
The related website has precise URLs for every language, however there's best one app HTTP URL. The app uses system language settings to display the appropriate language content material.
The related website has one URL for all languages (or it supports only one language), and there is one corresponding app URL. The website and the utility should display the content inside the identical language when the consumer has set no desire.
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