Develop Reference

Is it possible to fetch the app analytics data from firebase using java spring boot api [duplicate]

Is there any way i can query in my app for data from the analytics tab of dashboard?
For example:
ref.on("value", function(dashboard) {
console.log(dashboard.concurrentUsers)
});

From the "dashboard.concurrentUsers" in your question, it looks like you're trying to get the data from the Analytics tab of your dashboard.
As of Oct/Nov 2020 there is an Analytics Data API that you can use to run Analytics reports and retrieve data
You can also enable the BigQuery integration. Doing this means that all Google Analytics for Firebase events from that moment on will be written to BigQuery, where you can query them. This is the raw data, the events written by your apps, and not the aggregated data that you find in the dashboard.

Is there a way to make MongoDB Atlas Cloud DB work like a Realtime Database?

I am making an Android Java Application which requires following features;
Required Features for the Application
Messaging between 2 users or multiple users that include;
Text messaging, Voice messaging, image messaging(Just like WhatsApp)
Push Notifications whenever a user gets a message, or someone takes a screenshot in chat (Just like Snapchat)
In App Voice calls and Video calls
Technology Stack
Java for Android in Android Studio
NodeJS for making API
MongoDB Atlas Cloud Client for Database
What I did
I was making the API Get request to Get all the messages from the Database and display it on the RecyclerView but since the Database is not Realtime so whenever a new message is added in Database then I would have to open the application again from scratch so that a new Get request is sent and the data is fetched to RecyclerView.
Question
Hence,
Is there a way to make chatting Realtime with the mentioned technology stack? That is; with NodeJS and MongoDB Atlas Client without having to buy the realtime database?

SQLite - Database minus list of values

I am working on project where I need to load data from local mobile DB(SQLite) to UI in meanwhile load data from server and when data download is finished insert the data from server to the database and update UI. I searching for way to download data from server and instead of delete all data in database and insert the new valid data just find the changes and "update" database. Is there some correct way to do this. I am working with SQLite database on Android phone.

SQLite isn't an online database meant to be ran on a server.
There aren't any free SQL Server options that I know of, but the NoSQL options include Firebase Realtime Database, Firebase Cloud Firestore, Realm Platform, Couchbase Mobile, Parse Server, etc...
Each of the listed options allow you to listen only to changes in the data. SQLite does not provide this option itself.

Convert SQL query to Android Azure Mobile Service query - DISTINCT Statement

SQL Statement:
SELECT DISTINCT * messages FROM messages WHERE sender_id = 1
Into Azure Mobile Service
messagesTable.where().field("sender_id").eq(1).execute().get();
The problem is selecting DISTINCT columns. This is on android.

It sounds like you want to use Android client SDK for Azure Mobile Apps to write the code for querying the DISTINCT column, but there is not any method directly support it via Query interface on Android client SDK.
The only way is calling a custom API from android client to execute custom SQL statements at the backend server, please refer to the subsection How to: Execute custom SQL statements of the document section Custom APIs and the data/execute method for Node.js backend.

Connecting to a database server in Android

I have an Android application with a user authentication module. Currently the system checks the user name locally. I need it to connect to a remote database server and check the user names by looking at the remote server. What is the most efficient way to do such task on Android?

We can use Mysql server . We need to use the website in between the android app and database.
The android makes the call to website and the website request to mysql database .In return the mysql database provides the data to the website which further returns the json format to the application. finally the data from the web is parsed and used in our application.
For more detail about Mysql with php click here