Firebase Part 2 Email & Password Authentication

Firebase Email & Password Authentication Part 2

Welcome tocodingbihar.com. In the last tutorial we have connected firebase with our app and downloaded google-services.json file now this is the second part in which we will add dependency and google-services.json file

How to add dependency?

We can directly add the dependency but it is a little different as we do with older version of android studio.

Lets see how we add in the latest version of Android Studio Iguana

Step1- Go to build.gradle.kts(Module :app)

(A) Add in

plugins {

id("com.google.gms.google-services")

}

(B) Add in

dependencies{

implementation(libs.firebase.auth)

implementation(libs.androidx.navigation.compose)

}

Step 2- Go to libs.versions.toml(Version Catalog) here we add versions and libraries

(A) In the [versions] section add

googleServices = "4.4.1"

firebaseAuth = "22.3.1"

navigationCompose = "2.7.7"

(B) In [libraries] section add the following

google-services = { group = "com.google.gms", name = "google-services", version.ref = "googleServices" }

firebase-auth = { group = "com.google.firebase", name = "firebase-auth", version.ref = "firebaseAuth" }

androidx-navigation-compose = { group = "androidx.navigation", name = "navigation-compose", version.ref = "navigationCompose" }

Another method?

This is the simple method to add dependency

Go to Tools>Firebase>Authentication

Click on Authentication using a custom authentication system

Here as we connected firebase with our app before so we can see app is connected is checked

so just we need to click on Add the Firebase Authentication SDK to your app a pop up window appear click on button "Accept changes"

How to add google-services.gson file?

Right Click on Android top left side and select Project

Now we are in Project View mode

Copy the google-services.json file and right click on app in Android Studio and paste it. we can see our google-services.json file by clicking app in project view mode.

Now everything is done lets do coding....

MainActivity

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package com.codingbihar.firebaseproject

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.OutlinedButton
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import androidx.navigation.NavController
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.rememberNavController
import com.codingbihar.firebaseproject.ui.theme.FirebaseProjectTheme

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            FirebaseProjectTheme {
                // A surface container using the 'background' color from the theme
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colorScheme.background
                ) {


                    HomeScreen()
                }
            }
        }
    }
}

@Composable
fun HomeScreen() {
    val navController = rememberNavController()
    NavHost(
        navController = navController,
        startDestination = "mainScreen"
    ) {
        composable("mainScreen") {
            MainScreen(navController = navController)
        }
        composable("signUpScreen") {
            SignUpScreen(navController)
        }
        composable("SignInScreen") {
            SignInScreen(navController)
        }
        composable("SuccessfulScreen") {
            SuccessfulScreen()
        }
        composable("ForgotPassword") {
            ForgotPasswordScreen()
        }
    }
}

@Composable
fun MainScreen(navController: NavController) {
    Column (Modifier.fillMaxSize(),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ){
        Text(text = "Firebase Project\nEmail/Password Authentication")
        Row (
            Modifier
                .fillMaxWidth()
                .padding(top = 30.dp),
            horizontalArrangement = Arrangement.Center){
            OutlinedButton(onClick = { navController.navigate("signUpScreen") }) {
                Text(text = "SignUp")
            }
            Spacer(modifier = Modifier.width(100.dp))

            OutlinedButton(onClick = { navController.navigate("signInScreen")}) {
                Text(text = "SignIn")

            }
        }


    }

}

SignUpScreen

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package com.codingbihar.firebaseproject

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Button
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import androidx.navigation.NavController
import com.google.firebase.auth.FirebaseAuth

@Composable
fun SignUpScreen(navController: NavController) {
    var email by remember { mutableStateOf("") }
    var password by remember { mutableStateOf("") }

    Column(
        modifier = Modifier
            .fillMaxSize()
            .padding(16.dp),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        OutlinedTextField(
            value = email,
            onValueChange = { email = it },
            label = { Text("Email") },
            modifier = Modifier.fillMaxWidth()
        )
        Spacer(modifier = Modifier.height(16.dp))
        OutlinedTextField(
            value = password,
            onValueChange = { password = it },
            label = { Text("Password") },
            modifier = Modifier.fillMaxWidth()
        )
        Spacer(modifier = Modifier.height(16.dp))
        Button(onClick = {
            if (email.isNotEmpty() && password.isNotEmpty()) {
                FirebaseAuth.getInstance().createUserWithEmailAndPassword(email, password)
                    .addOnCompleteListener { task ->
                        if (task.isSuccessful) {
                            // Sign-up successful
                            // You may navigate to another screen or show a confirmation message
                            println("Sign-up successful")
                            navController.popBackStack()
                        } else {
                            // Handle sign-up failure
                            println("Sign-up failed: ${task.exception?.message}")
                        }
                    }
            } else {
                // Show error message or toast indicating empty fields
                println("Email or password field is empty")
            }
        }) {
            Text("Sign Up")
        }
    }
}

SignInScreen

Copy this code →


package com.codingbihar.firebaseproject

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Button
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import androidx.navigation.NavController
import com.google.firebase.auth.FirebaseAuth

@Composable
fun SignInScreen(navController: NavController) {
    var email by remember { mutableStateOf("") }
    var password by remember { mutableStateOf("") }
    val errorMessage = remember { mutableStateOf("") }

    Column(
        modifier = Modifier
            .fillMaxSize()
            .padding(16.dp),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        OutlinedTextField(
            value = email,
            onValueChange = { email = it },
            label = { Text("Email") },
            modifier = Modifier.fillMaxWidth()
        )
        Spacer(modifier = Modifier.height(16.dp))
        OutlinedTextField(
            value = password,
            onValueChange = { password = it },
            label = { Text("Password") },
            modifier = Modifier.fillMaxWidth()
        )
        Spacer(modifier = Modifier.height(16.dp))
        Button(onClick = {
            if (email.isNotEmpty() && password.isNotEmpty()) {
                FirebaseAuth.getInstance().signInWithEmailAndPassword(email, password)
                    .addOnCompleteListener { task ->
                        if (task.isSuccessful) {
                            navController.navigate("SuccessfulScreen")
                        } else {
                            // Login failed, update error message
                            println("Login-up unsuccessful")
                            //errorMessage.value = task.exception?.message ?: "Unknown error"
                        }
                    }
            } else {
                // Show error message for empty email or password
                errorMessage.value = "Please fill in all fields"
            }
        }) {
            Text("Login")
        }
        Spacer(modifier = Modifier.height(8.dp))
        TextButton(onClick = { navController.navigate("ForgotPassword") }) {
            Text("Forgot Password?")
        }
    }
}

ForgotPassword

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package com.codingbihar.jetpackcredit

import android.widget.Toast
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Button
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.unit.dp
import androidx.navigation.NavController
import com.google.firebase.auth.FirebaseAuth

@Composable
fun ForgotPasswordScreen(navController: NavController) {
    var email by remember { mutableStateOf("") }
    val context = LocalContext.current

    Column(
        modifier = Modifier
            .fillMaxSize()
            .padding(16.dp),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        OutlinedTextField(
            value = email,
            onValueChange = { email = it },
            label = { Text("Email") },
            modifier = Modifier.fillMaxWidth()
        )
        Spacer(modifier = Modifier.height(16.dp))
        Button(onClick = {

            if (email.isEmpty()){
                Toast.makeText(context,"Email is not filled", Toast.LENGTH_LONG).show()

            }
            else if (email.isNotEmpty()) FirebaseAuth.getInstance().sendPasswordResetEmail(email)
                .addOnCompleteListener { task ->
                    if (task.isSuccessful) {
                        // Password reset email sent successfully
                        // You may navigate to another screen or show a confirmation message
                        println("Password reset email sent successfully")
                        navController.popBackStack()
                        
                    } else {
                        // Handle password reset email failure
                        println("Password reset email failed: ${task.exception?.message}")
                    }
                } else {
                // Show error message or toast indicating empty email field
                println("Email field is empty")
            }
        }) {

            Text("Reset Password")
        }
    }
}

SuccessfulScreen

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package com.codingbihar.firebaseproject

import androidx.compose.material3.Text
import androidx.compose.runtime.Composable

@Composable
fun SuccessfulScreen() {
    Text(text = "Successful Authentication Screen")
    
}