Let's build Real Time Chat using Firebase. You don’t have to create and maintain a separate database to store firebase chat. Firebase do it automatically for you. Just create an app and database will be maintained by firebase automatically.

Initially, Create and Setup Firebase Project

  1. Go to the Firebase Console.

  2. Select Add project.

  3. Enter a project name.

    Now, you can follow the remaining setup steps in the Firebase console, click Create project (or Add Firebase, if you're using an existing Google project).

Next, Add google-services.json file to your app:

- After adding the package name and SHA1 select Register
- Then, Click Download google-services.json to obtain your Firebase Android config file

- Now, copy the google-services.json file into the app directory of your project.

Further, Add google-services plugin to your app

Here, The google-services plugin uses the google-services.json file for configuring your application to use Firebase. This line should already be added to the end of the build.gradle file in the app directory of your project app.

apply plugin: 'com.google.gms.google-services'

Enable Authentication Now: In firebase console, Enable your authentication database rules.


"rules": {

".read": "auth != null",

".write": "auth != null"



- Add Firebase Auth dependency and Read and Write Data

Add in app/build.gradle:

implementation 'com.google.firebase:firebase-auth'

implementation 'com.google.firebase:firebase-database'

implementation 'com.google.firebase:firebase-storage'

Sync your project Now: After adding dependencies sync your project.

- Now we will move to Main Coding part: Firstly, we will initiate authentication.

private FirebaseAuth mFirebaseAuth; // Firebase instance variables

private FirebaseUser mFirebaseUser;

mFirebaseAuth = FirebaseAuth.getInstance(); // Initialize FirebaseAuth

mFirebaseUser = mFirebaseAuth.getCurrentUser();

if (mFirebaseUser == null) {

// startActivity(new Intent(this, SignInActivity.class));

// finish();


} else {

mUsername = mFirebaseUser.getDisplayName();

if (mFirebaseUser.getPhotoUrl() != null) {

mPhotoUrl = mFirebaseUser.getPhotoUrl().toString();



Login With a firebase: Need to login with a firebase to get details.


.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {


public void onComplete(@NonNull Task<AuthResult> task) {

if (task.isSuccessful()) {

FirebaseUser current_user = FirebaseAuth.getInstance().getCurrentUser();

final String uid = current_user.getUid();




Add Users: Following below steps to add users into the firebase database.


String device_token = shpfcm.getString("fcm","");

HashMap<String, String> userMap = new HashMap<>();

userMap.put("name", getIntent().getStringExtra("name"));

userMap.put("status", "Welcome to My Chat App.");

userMap.put("image", "default");

userMap.put("phone", getIntent().getStringExtra("code")+getIntent().getStringExtra("mobile"));

userMap.put("thumb_image", "default");

userMap.put("requests", "0");

userMap.put("unread_total", "0");

userMap.put("device_token", device_token);

mDatabase.setValue(userMap).addOnCompleteListener(new OnCompleteListener<Void>() {


public void onComplete(@NonNull Task<Void> task) {





Finally, you can see users into the firebase database like this:


These are easy steps to setup real time chat using firebase completely. Follow us to stay updated for upcoming article "How to make friends in Firebase Database". Enjoy!!!

About the Author

  • Vipan Vyas

    Sr. Android Developer

    Having 6+ years of experience with excellent skills in Android application development. I like to develop challenging apps.

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