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  • Getting Started with Firebase in Android (Sign in/Sign up Example)

Getting Started with Firebase in Android (Sign in/Sign up Example)

August 5, 2016 – by BeginnersHeap 0

Introduction to Firebase

Firebase is a simple cloud-based Google service to avoid server side scripting with a lot of built-in features like authentication with social media platforms like Facebook, Twitter, and  Google.  It comes up with many more features like Realtime database, Storage features, Cloud messaging, hosting, remote configuration, app indexing and all other Google features for marketing and development. Firebase is also taking over the GCM (Google Cloud Messaging) features as it has real-time update feature with GCM. It also supports JavaScript features including support for AngularJS, IOS, and Android.

Getting Started with Firebase

Before getting started with Firebase, you must get yourself registered with the Firebase.

Download Firebase Android Studio Sign in/Sign up Demo Project

Register with Firebase

  1. Open Firebase Google Console and Click on GET STARTED FOR FREE. You will need to login to your Google Account if you already have one or you must create a new Google account.
  2. Now CREATE A NEW PROJECT, name your first project and click CREATE PROJECT.

    First Firebase Project
    First Firebase Project
  3.   Create a new Project in Android Studio.
  4. Click on Add Firebase to Your Android App. Find the package name of your project and Add App to Firebase. This will download google-services.json for your Android App.

    Add App to Firebase
    Add App to Firebase
  5. Set the project directories to Project view from Android in Android Studio.

    Switch to Project view in Android Studio
    Switch to Project view in Android Studio
  6. Drag and Drop google-services.json in the app directory of your project.

    Drag and Drop Google-Service.json in the App Directory
    Drag and Drop Google-Service.json in the App Directory
  7. It will ask to rename the file if required. Leave it to as is and press OK to add the file to the root directory of your project.
  8. Move forward and click finish to Add App to firebase.

    Application added to Firebase
    Application added to Firebase

Setting Up Dependencies

Add Classpath

Open build.gradle (Project: Firebase) and add classpath in the dependencies and press Sync Now link at the top-right end of the file. This will synchronize your project.

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classpath 'com.google.gms:google-services:3.0.0'

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dependencies {
    classpath 'com.android.tools.build:gradle:2.1.2'
 
    classpath 'com.google.gms:google-services:3.0.0'
    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}

Apply Plugin

Now in the build.gradle (Module: App) apply plugin for google-services.

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

Add Firebase Authentication

In build.gradle (Module: App) also add a dependency for Firebase Authentication.

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compile 'com.google.firebase:firebase-auth:9.2.1'

Complete code for build.gradle (Module: App)

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apply plugin: 'com.android.application'
 
apply plugin: 'com.google.gms.google-services'
 
android {
    compileSdkVersion 24
    buildToolsVersion "24.0.1"
 
    defaultConfig {
        applicationId "com.example.muneeb.firstfirebase"
        minSdkVersion 13
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
 
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:24.1.0'
 
    compile 'com.google.firebase:firebase-auth:9.2.1'
}

Again Sync your project for synchronization.

Enable Email and Password Authentication from Firebase Dashboard

Open Firebase dashboard, Click on Auth link at the left side of the dashboard menu and SET UP SIGN-IN METHOD. Select and enable Email/Password Sign-in.

Set up sign-in method from Firebase google console
Set up sign-in method from Firebase Google console

Download Android Studio Configured Sign in/Sign up Demo Project

Sign-up/Register User

Create Sign-up Form

To register a user create a sign-up form so that the users can put up their credentials and can log-in to your application.

Sign up form for Firebase
Sign up form for Firebase

Complete XML Code for Sign-up Form

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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.muneeb.firstfirebase.MainActivity">
 
    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textEmailAddress"
        android:ems="10"
        android:id="@+id/email"
        android:layout_marginTop="180dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignRight="@+id/password"
        android:layout_alignEnd="@+id/password"
        android:hint="Enter Email Address"/>
 
    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPassword"
        android:ems="10"
        android:id="@+id/password"
        android:layout_below="@+id/email"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_marginTop="40dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:hint="Enter Password"/>
 
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Sign Up"
        android:id="@+id/button"
        android:layout_below="@+id/password"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="79dp"
        android:onClick="signup"/>
</RelativeLayout>

Implement the Button onClick Listener and Get Text from Text Fields

Now in the Java file of your project, create button onClick handler and get Text from the email and password fields. You must check whether the email and text fields are empty or not.

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public void signup(View v)
{
    //get text fields
    EditText Email=(EditText) findViewById(R.id.email);
    EditText Password=(EditText) findViewById(R.id.password);
 
    //get data from text fields
    String userEmail=Email.getText().toString();
    String userPassword=Password.getText().toString();
 
    //check if the fields are empty
    if(TextUtils.isEmpty(userEmail)){
        Toast.makeText(this,"Please enter email",Toast.LENGTH_LONG).show();
        return;
    }
 
    if(TextUtils.isEmpty(userPassword)){
        Toast.makeText(this,"Please enter password",Toast.LENGTH_LONG).show();
        return;
    }
        
}

 

Register User with Firebase Auth

You will need an instance of FirebaseAuth to register a user with FirebaseAuth.

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FirebaseAuth firebaseAuth=FirebaseAuth.getInstance();

implement createUserWithEmailAndPassword(email, password)  method along with the addOnCompleteListener(). The response will be returned in onComplete() overridden method.

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//Register user with firebase
firebaseAuth.createUserWithEmailAndPassword(userEmail, userPassword)
        .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
               //checking if success
               if(task.isSuccessful()){
                   //display some message here
                   Toast.makeText(MainActivity.this,"Successfully registered",Toast.LENGTH_LONG).show();
                }else{
                    //display some message here
                    Toast.makeText(MainActivity.this,"Registration Failed",Toast.LENGTH_LONG).show();
                }
            }
        });

You can also display progress dialog until the registration process is carried out (It is not necessary to show the progress dialog).

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//instantiate progress dialog
final ProgressDialog progressDialog=new ProgressDialog(MainActivity.this);
 
//Show waiting dialog box until user is registered
progressDialog.setMessage("Registering User...");
progressDialog.show();

Includes for FirebaseAuth Application

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import android.app.ProgressDialog;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
 
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;

Complete Code for Sign-up

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public void signup(View v)
{
    //get text fields
    EditText Email=(EditText) findViewById(R.id.email);
    EditText Password=(EditText) findViewById(R.id.password);
 
    //get data from text fields
    String userEmail=Email.getText().toString();
    String userPassword=Password.getText().toString();
 
    //check if the fields are empty
    if(TextUtils.isEmpty(userEmail)){
        Toast.makeText(this,"Please enter email",Toast.LENGTH_LONG).show();
        return;
    }
 
    if(TextUtils.isEmpty(userPassword)){
        Toast.makeText(this,"Please enter password",Toast.LENGTH_LONG).show();
        return;
    }
 
    //instantiate progress dialog
    final ProgressDialog progressDialog=new ProgressDialog(MainActivity.this);
 
    //Show waiting dialog box until user is registered
    progressDialog.setMessage("Registering User...");
    progressDialog.show();
 
    //FirebaseAuth instance
    FirebaseAuth firebaseAuth=FirebaseAuth.getInstance();
 
    //Register user with firebase
    firebaseAuth.createUserWithEmailAndPassword(userEmail, userPassword)
            .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    //checking if success
                    if(task.isSuccessful()){
                        //display some message here
                        Toast.makeText(MainActivity.this,"Successfully registered",Toast.LENGTH_LONG).show();
                    }else{
                        //display some message here
                        Toast.makeText(MainActivity.this,"Registration Failed",Toast.LENGTH_LONG).show();
                    }
                    progressDialog.dismiss();
                }
            });
 
}

User Registered with Firebase Auth
User Registered with Firebase Auth

Sign in/Login User

Modify the Sign-up Form

To use the user credentials for signing in you will also need FirebaseAuth. For the ease of the user, you can use the same sign-up form and modify it as below so the user can sign in with the same sign-up form. So now the Sign-in and Sign-up form will look like.

Signin and Signup form for Firebase Auth
Sign in and Signup form for Firebase Auth

Complete XML Code for Sign-in/Sign-up Form ‘activity_main.xml‘

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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.muneeb.firstfirebase.MainActivity">
 
    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textEmailAddress"
        android:ems="10"
        android:id="@+id/email"
        android:layout_marginTop="180dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignRight="@+id/password"
        android:layout_alignEnd="@+id/password"
        android:hint="Enter Email Address"/>
 
    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPassword"
        android:ems="10"
        android:id="@+id/password"
        android:layout_below="@+id/email"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_marginTop="40dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:hint="Enter Password"/>
 
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Sign Up"
        android:id="@+id/button"
        android:onClick="signup"
        android:layout_below="@+id/password"
        android:layout_alignRight="@+id/password"
        android:layout_alignEnd="@+id/password" />
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Already Registered?"
        android:id="@+id/textView"
        android:layout_below="@+id/button"
        android:layout_alignRight="@+id/button"
        android:layout_alignEnd="@+id/button"
        android:layout_marginTop="40dp" />
 
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Sign in with Above Credentials"
        android:id="@+id/button2"
        android:layout_below="@+id/textView"
        android:layout_alignRight="@+id/textView"
        android:layout_alignEnd="@+id/textView"
        android:onClick="signin" />
 
 
</RelativeLayout>

Implement onClick Listener

Create the button click listener in the Java file so that when the user enters the credentials and press the SIGN IN button, it will get the credentials from the text fields and authenticate the user begore signing in. You can follow the same procedure to get the text from the text fields or you can also declare the text fields with class level scope and initialize them in onCreate() method. I am separately declaring and initializing the text fields for more clarity of the code.

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public void signin(View v)
{
    //get text fields
    EditText email=(EditText) findViewById(R.id.email);
    EditText password=(EditText) findViewById(R.id.password);
 
    //get data from text fields
    String userEmail=email.getText().toString();
    String userPassword=password.getText().toString();
 
    //check if the fields are empty
    if(TextUtils.isEmpty(userEmail)){
        Toast.makeText(this,"Please enter email",Toast.LENGTH_LONG).show();
        return;
    }
 
    if(TextUtils.isEmpty(userPassword)){
        Toast.makeText(this,"Please enter password",Toast.LENGTH_LONG).show();
        return;
    }
 
    //instantiate progress dialog
    final ProgressDialog progressDialog=new ProgressDialog(MainActivity.this);
 
    //Show waiting dialog box until user is registered
    progressDialog.setMessage("Logging In...");
    progressDialog.show();
 
    //FirebaseAuth instance
    FirebaseAuth firebaseAuth=FirebaseAuth.getInstance();
}

Authenticate and Login User with Firebase Auth

implement signInWithEmailAndPassword(email, password)  method along with the addOnCompleteListener(). The response will be returned in onComplete() overridden method.

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//logging in the user
firebaseAuth.signInWithEmailAndPassword(userEmail, userPassword)
        .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                progressDialog.dismiss();
                //if the task is successfull
                if(task.isSuccessful()){
                    //start the profile activity
                    Toast.makeText(MainActivity.this,"Success",Toast.LENGTH_LONG).show();
                    finish();
                    startActivity(new Intent(getApplicationContext(), HomeActivity.class));
                }
                else
                {
                    Toast.makeText(MainActivity.this,"Invalid Credentials",Toast.LENGTH_LONG).show();
                }
            }
        });

Now the complete java code for Login Button listener will be

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public void signin(View v)
{
    //get text fields
    EditText email=(EditText) findViewById(R.id.email);
    EditText password=(EditText) findViewById(R.id.password);
 
    //get data from text fields
    String userEmail=email.getText().toString();
    String userPassword=password.getText().toString();
 
    //check if the fields are empty
    if(TextUtils.isEmpty(userEmail)){
        Toast.makeText(this,"Please enter email",Toast.LENGTH_LONG).show();
        return;
    }
 
    if(TextUtils.isEmpty(userPassword)){
        Toast.makeText(this,"Please enter password",Toast.LENGTH_LONG).show();
        return;
    }
 
    //instantiate progress dialog
    final ProgressDialog progressDialog=new ProgressDialog(MainActivity.this);
 
    //Show waiting dialog box until user is registered
    progressDialog.setMessage("Logging In...");
    progressDialog.show();
 
    //FirebaseAuth instance
    FirebaseAuth firebaseAuth=FirebaseAuth.getInstance();
 
    //logging in the user
    firebaseAuth.signInWithEmailAndPassword(userEmail, userPassword)
            .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    progressDialog.dismiss();
                    //if the task is successfull
                    if(task.isSuccessful()){
                        //start the profile activity
                        Toast.makeText(MainActivity.this,"Success",Toast.LENGTH_LONG).show();
                        finish();
                        startActivity(new Intent(getApplicationContext(), HomeActivity.class));
                    }
                    else
                    {
                        Toast.makeText(MainActivity.this,"Invalid Credentials",Toast.LENGTH_LONG).show();
                    }
                }
            });
 
}

Create Demo Home Screen For the User

You will also need a demo home screen, so that when the user is logged in successfully, he/she must be directed toward another home screen activity for registered and logged in users. A LOGOUT button must be there for the user to log-out.

Home Screen for Authenticated User
Home Screen for Authenticated User

Complete Home Screen ‘activity_home.xml’ Code

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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.muneeb.firstfirebase.HomeActivity">
 
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Logout"
        android:id="@+id/button3"
        android:layout_alignParentTop="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:onClick="logout"/>
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Howdy!"
        android:id="@+id/textView2"
        android:layout_alignBottom="@+id/button3"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:id="@+id/EmailUser"
        android:layout_below="@+id/button3"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />
 
</RelativeLayout>

Implement Click Listener for LOGOUT button

To logout user, you need to call signOut() method of Firebase class.

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public void logout(View v)
{
    //logout user
    firebaseAuth.signOut();
 
    //finish home screen activity
    finish();
 
    //starting main activity
    startActivity(new Intent(this, MainActivity.class));
}

Check if the User is not Signed in

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//check if the user is not logged in
if(firebaseAuth.getCurrentUser() == null){
    //closing current home activity
    finish();
 
    //start Main activity
    startActivity(new Intent(this, MainActivity.class));
}

Get the Email of Logged in User

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//Get Firebase logged in user
FirebaseUser firebaseuser = firebaseAuth.getCurrentUser();
 
//set email address on screen for the current logged in user
TextView emailuser= (TextView) findViewById(R.id.EmailUser);
emailuser.setText(firebaseuser.getEmail().toString());

Forget Password Email for Registered Users

Similarly, Firebase also provides a wonderful feature to recover the password. incase user forgets the password. Firebase automatically sends the password reset link to the registered email address. You will need to provide the email address for which the user wants to reset the password. To send the recovery email sendPasswordResetEmail(email) method of FirebaseAuth class is used.

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//FirebaseAuth instance
FirebaseAuth firebaseAuth=FirebaseAuth.getInstance();
 
//Send Password Reset Link
firebaseAuth.sendPasswordResetEmail(email)
                        .addOnCompleteListener(new OnCompleteListener<Void>() {
                            @Override
                            public void onComplete(@NonNull Task<Void> task) {
                                if (task.isSuccessful()) {
                                    Toast.makeText(ResetPasswordActivity.this, "We have sent you instructions to reset your password!", Toast.LENGTH_SHORT).show();
                                } else {
                                    Toast.makeText(ResetPasswordActivity.this, "Failed to send reset email!", Toast.LENGTH_SHORT).show();
                                }
                                progressBar.setVisibility(View.GONE);
                            }
                        });

Complete Code for HomeActivity.java

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package com.example.muneeb.firstfirebase;
 
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
 
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
 
public class HomeActivity extends AppCompatActivity {
 
    FirebaseAuth firebaseAuth;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
 
        //initializing Firebase user
        firebaseAuth = FirebaseAuth.getInstance();
 
        //check if the user is not logged in
        if(firebaseAuth.getCurrentUser() == null){
            //closing current home activity
            finish();
 
            //start Main activity
            startActivity(new Intent(this, MainActivity.class));
        }
 
        //Get Firebase logged in user
        FirebaseUser firebaseuser = firebaseAuth.getCurrentUser();
 
        //set email address on screen for the current logged in user
        TextView emailuser= (TextView) findViewById(R.id.EmailUser);
        emailuser.setText(firebaseuser.getEmail().toString());
 
    }
 
    public void logout(View v)
    {
        //logout user
        firebaseAuth.signOut();
 
        //finish home screen activity
        finish();
 
        //starting main activity
        startActivity(new Intent(this, MainActivity.class));
    }
}

Complete Code for ActivityMain.xml

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package com.example.muneeb.firstfirebase;
 
import android.app.ProgressDialog;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
 
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
 
    public void signup(View v)
    {
        //get text fields
        EditText Email=(EditText) findViewById(R.id.email);
        EditText Password=(EditText) findViewById(R.id.password);
 
        //get data from text fields
        String userEmail=Email.getText().toString();
        String userPassword=Password.getText().toString();
 
        //check if the fields are empty
        if(TextUtils.isEmpty(userEmail)){
            Toast.makeText(this,"Please enter email",Toast.LENGTH_LONG).show();
            return;
        }
 
        if(TextUtils.isEmpty(userPassword)){
            Toast.makeText(this,"Please enter password",Toast.LENGTH_LONG).show();
            return;
        }
 
        //instantiate progress dialog
        final ProgressDialog progressDialog=new ProgressDialog(MainActivity.this);
 
        //Show waiting dialog box until user is registered
        progressDialog.setMessage("Registering User...");
        progressDialog.show();
 
        //FirebaseAuth instance
        FirebaseAuth firebaseAuth=FirebaseAuth.getInstance();
 
        //Register user with firebase
        firebaseAuth.createUserWithEmailAndPassword(userEmail, userPassword)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        //checking if success
                        if(task.isSuccessful()){
                            //display some message here
                            Toast.makeText(MainActivity.this,"Successfully registered",Toast.LENGTH_LONG).show();
                        }else{
                            //display some message here
                            Toast.makeText(MainActivity.this,"Registration Failed",Toast.LENGTH_LONG).show();
                        }
                        progressDialog.dismiss();
                    }
                });
 
    }
    
    //-----------------------------------------------------------Signin Code-------------------------------------------------------
 
    public void signin(View v)
    {
        //get text fields
        EditText email=(EditText) findViewById(R.id.email);
        EditText password=(EditText) findViewById(R.id.password);
 
        //get data from text fields
        String userEmail=email.getText().toString();
        String userPassword=password.getText().toString();
 
        //check if the fields are empty
        if(TextUtils.isEmpty(userEmail)){
            Toast.makeText(this,"Please enter email",Toast.LENGTH_LONG).show();
            return;
        }
 
        if(TextUtils.isEmpty(userPassword)){
            Toast.makeText(this,"Please enter password",Toast.LENGTH_LONG).show();
            return;
        }
 
        //instantiate progress dialog
        final ProgressDialog progressDialog=new ProgressDialog(MainActivity.this);
 
        //Show waiting dialog box until user is registered
        progressDialog.setMessage("Logging In...");
        progressDialog.show();
 
        //FirebaseAuth instance
        FirebaseAuth firebaseAuth=FirebaseAuth.getInstance();
 
        //logging in the user
        firebaseAuth.signInWithEmailAndPassword(userEmail, userPassword)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        progressDialog.dismiss();
                        //if the task is successfull
                        if(task.isSuccessful()){
                            //start the profile activity
                            Toast.makeText(MainActivity.this,"Success",Toast.LENGTH_LONG).show();
                            finish();
                            startActivity(new Intent(getApplicationContext(), HomeActivity.class));
                        }
                        else
                        {
                            Toast.makeText(MainActivity.this,"Invalid Credentials",Toast.LENGTH_LONG).show();
                        }
                    }
                });
 
    }
}

Firebase Sign In Sign Up user Authentication Application
Firebase Sign In Sign Up user Authentication Application

Download Firebase Sign in/ Sign up Demo Application

 Hope that you like this tutorial. Stay tuned for more upcoming tutorials. Stay blessed!

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Posted in: Android Tagged: Apply Firebase Plugin for Android Studio, Class path for Firebase, createUserWithEmailAndPassword, Easy user registration with Firebase, Email and Password Authentication for Firebase in Android, fire base, Firebase Authentication for Android Studio, firebase examples for beginners, Firebase password recovery, Firebase Password reset link for registered users, Firebase Registration, firebase send email for password recovery, Firebase tutorial for beginners, getting started with Firebase Google console, handle response from firebase server, Introduction to Firebase, Register with Firebase, Same form to sign up and Sign in for Google Firebase Auth, set up environment for Firebase, Sign in from Firebase Cloud Storage database, Sign up user with Firebase Cloud Storage, signInWithEmailAndPassword, Single Activity Sign in and Sign up using Firebase authentication
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