Firebase is a mobile and web application development platform. It provides services that a web application or mobile application might require. Firebase provides email and password authentication without any overhead of building the backend for user authentication. In this article, we will learn the firebase authentication feature. Using it we can create a Login and Registration page in our app.
Step by Step Implementation
Step 1: First, We need to connect our project with Firebase. For that, we need to go to tools the select firebase option
.
Step 2: Now as we need the Firebase authentication feature, In authentication, we have different options. For this article, we will use Authenticate using a custom authentication system. We will click on connect. And add the firebase Authentication SDK to your app.
Step 3: Now we will create an XML layout for the Registration Activity.
<? xml version = "1.0" encoding = "utf-8" ?>
< androidx.constraintlayout.widget.ConstraintLayout
android:layout_width = "match_parent"
android:layout_height = "match_parent" >
< LinearLayout
android:id = "@+id/linearLayout"
android:layout_width = "0dp"
android:layout_height = "0dp"
android:orientation = "vertical"
android:padding = "15dp"
android:paddingTop = "40dp"
android:paddingBottom = "40dp"
app:layout_constraintBottom_toTopOf = "@+id/imageView2"
app:layout_constraintEnd_toEndOf = "parent"
app:layout_constraintStart_toStartOf = "parent"
app:layout_constraintTop_toTopOf = "parent" >
< EditText
android:id = "@+id/etSEmailAddress"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:layout_marginLeft = "15dp"
android:layout_marginTop = "30dp"
android:layout_marginRight = "15dp"
android:autofillHints = "emailAddress"
android:ems = "10"
android:hint = "@string/email"
android:inputType = "textEmailAddress"
android:minHeight = "48dp"
android:textColorHint = "#757575" />
< EditText
android:id = "@+id/etSPassword"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:layout_marginLeft = "15dp"
android:layout_marginTop = "15dp"
android:layout_marginRight = "15dp"
android:autofillHints = "password"
android:ems = "10"
android:hint = "@string/password"
android:inputType = "textPassword"
android:minHeight = "48dp"
android:textColorHint = "#757575" />
< EditText
android:id = "@+id/etSConfPassword"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:layout_marginLeft = "15dp"
android:layout_marginTop = "15dp"
android:layout_marginRight = "15dp"
android:autofillHints = "password"
android:ems = "10"
android:hint = "@string/confirm_password"
android:inputType = "textPassword"
android:minHeight = "48dp"
android:textColorHint = "#757575"
tools:ignore = "TextContrastCheck" />
< Button
android:id = "@+id/btnSSigned"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:layout_margin = "15dp"
android:background = "@drawable/btn_primary"
android:text = "@string/signed" />
< TextView
android:id = "@+id/tvRedirectLogin"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:gravity = "center_horizontal"
android:layout_margin = "10dp"
android:text = "@string/already_have_an_account_login"
android:textColor = "#18206F"
android:textSize = "16sp" />
</ LinearLayout >
</ androidx.constraintlayout.widget.ConstraintLayout >
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Step 4: Now we will code for Registration activity
In the Registration activity, We will create a FirebaseAuth object, and using it we will call the createUserWithEmailAndPassword(email, pass) function. And check using addOnCompleteListener() function, if the response is successful then will display a Toast.
package com.ayush.quizapp.activity.activity
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.EditText
import android.widget.TextView
import android.widget.Toast
import com.ayush.quizapp.R
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.auth.ktx.auth
import com.google.firebase.ktx.Firebase
class SignUpActivity : AppCompatActivity() {
lateinit var etEmail: EditText
lateinit var etConfPass: EditText
private lateinit var etPass: EditText
private lateinit var btnSignUp: Button
lateinit var tvRedirectLogin: TextView
// create Firebase authentication object
private lateinit var auth: FirebaseAuth
override fun onCreate(savedInstanceState: Bundle?) {
super .onCreate(savedInstanceState)
setContentView(R.layout.activity_sign_up)
// View Bindings
etEmail = findViewById(R.id.etSEmailAddress)
etConfPass = findViewById(R.id.etSConfPassword)
etPass = findViewById(R.id.etSPassword)
btnSignUp = findViewById(R.id.btnSSigned)
tvRedirectLogin = findViewById(R.id.tvRedirectLogin)
// Initialising auth object
auth = Firebase.auth
btnSignUp.setOnClickListener {
signUpUser()
}
// switching from signUp Activity to Login Activity
tvRedirectLogin.setOnClickListener {
val intent = Intent( this , LoginActivity:: class .java)
startActivity(intent)
}
}
private fun signUpUser() {
val email = etEmail.text.toString()
val pass = etPass.text.toString()
val confirmPassword = etConfPass.text.toString()
// check pass
if (email.isBlank() || pass.isBlank() || confirmPassword.isBlank()) {
Toast.makeText( this , "Email and Password can't be blank" , Toast.LENGTH_SHORT).show()
return
}
if (pass != confirmPassword) {
Toast.makeText( this , "Password and Confirm Password do not match" , Toast.LENGTH_SHORT)
.show()
return
}
// If all credential are correct
// We call createUserWithEmailAndPassword
// using auth object and pass the
// email and pass in it.
auth.createUserWithEmailAndPassword(email, pass).addOnCompleteListener( this ) {
if (it.isSuccessful) {
Toast.makeText( this , "Successfully Singed Up" , Toast.LENGTH_SHORT).show()
finish()
} else {
Toast.makeText( this , "Singed Up Failed!" , Toast.LENGTH_SHORT).show()
}
}
}
} |
Step 5: Now we will design the Login Activity page. Here is the XML code
<? xml version = "1.0" encoding = "utf-8" ?>
< androidx.constraintlayout.widget.ConstraintLayout
android:layout_width = "match_parent"
android:layout_height = "match_parent"
tools:context = ".activity.activity.LoginActivity" >
< LinearLayout
android:layout_width = "0dp"
android:layout_height = "0dp"
app:layout_constraintBottom_toTopOf = "@+id/imageView3"
android:orientation = "vertical"
app:layout_constraintEnd_toEndOf = "parent"
app:layout_constraintStart_toStartOf = "parent"
app:layout_constraintTop_toTopOf = "parent" >
< EditText
android:id = "@+id/etEmailAddress"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:layout_marginLeft = "15dp"
android:layout_marginTop = "30dp"
android:layout_marginRight = "15dp"
android:autofillHints = "emailAddress"
android:ems = "10"
android:hint = "@string/email"
android:inputType = "textEmailAddress"
android:minHeight = "48dp"
android:textColorHint = "#757575" />
< EditText
android:id = "@+id/etPassword"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:layout_marginLeft = "15dp"
android:layout_marginTop = "15dp"
android:layout_marginRight = "15dp"
android:autofillHints = "password"
android:ems = "10"
android:hint = "@string/password"
android:inputType = "textPassword"
android:minHeight = "48dp"
android:textColorHint = "#757575" />
< Button
android:id = "@+id/btnLogin"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:layout_margin = "15dp"
android:background = "@drawable/btn_primary"
android:text = "@string/login" />
< TextView
android:id = "@+id/tvRedirectSignUp"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:layout_margin = "15dp"
android:gravity = "center_horizontal"
android:text = "@string/don_t_have_an_account_sign_in"
android:textColor = "#18206F"
android:textSize = "16sp" />
</ LinearLayout >
</ androidx.constraintlayout.widget.ConstraintLayout >
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Step 6: Now we will code for login activity
In login activity, We will create a FirebaseAuth object, and using it we will call the signInWithEmailAndPassword(email, pass) function. And check using the addOnCompleteListener() function, if the response is successful then will display a toast.
package com.ayush.quizapp.activity.activity
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.EditText
import android.widget.TextView
import android.widget.Toast
import com.ayush.quizapp.R
import com.google.firebase.auth.FirebaseAuth
class LoginActivity : AppCompatActivity() {
private lateinit var tvRedirectSignUp: TextView
lateinit var etEmail: EditText
private lateinit var etPass: EditText
lateinit var btnLogin: Button
// Creating firebaseAuth object
lateinit var auth: FirebaseAuth
override fun onCreate(savedInstanceState: Bundle?) {
super .onCreate(savedInstanceState)
setContentView(R.layout.activity_login)
// View Binding
tvRedirectSignUp = findViewById(R.id.tvRedirectSignUp)
btnLogin = findViewById(R.id.btnLogin)
etEmail = findViewById(R.id.etEmailAddress)
etPass = findViewById(R.id.etPassword)
// initialising Firebase auth object
auth = FirebaseAuth.getInstance()
btnLogin.setOnClickListener {
login()
}
tvRedirectSignUp.setOnClickListener {
val intent = Intent( this , SignUpActivity:: class .java)
startActivity(intent)
// using finish() to end the activity
finish()
}
}
private fun login() {
val email = etEmail.text.toString()
val pass = etPass.text.toString()
// calling signInWithEmailAndPassword(email, pass)
// function using Firebase auth object
// On successful response Display a Toast
auth.signInWithEmailAndPassword(email, pass).addOnCompleteListener( this ) {
if (it.isSuccessful) {
Toast.makeText( this , "Successfully LoggedIn" , Toast.LENGTH_SHORT).show()
} else
Toast.makeText( this , "Log In failed " , Toast.LENGTH_SHORT).show()
}
}
} |
Output: