login and registration using firebase in android studio

✅ byRajeshbhatt12 ✅ -

 

User authentication using Firebase in Android:



firebase login with email and password:

1-Login Activity

public class loginActivity extends AppCompatActivity {
    private EditText emailTV, passwordTV;
    private Button loginBtn,regBtn;
    private ProgressBar progressBar;

    private FirebaseAuth mAuth;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        mAuth = FirebaseAuth.getInstance();

        initializeUI();
        if(LoginUtils.isLogin(loginActivity.this)){
        Intent intent=new Intent(loginActivity.this,MainActivity.class);
        startActivity(intent);
            finish();
        }else {
           /* Intent intent=new Intent(loginActivity.this,RagistrationActivity.class);
            startActivity(intent);*/
        }

        loginBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                loginUserAccount();
            }
        });
        regBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               // registerNewUser();
                Intent intent=new Intent(loginActivity.this,RagistrationActivity.class);
                startActivity(intent);
            }
        });
    }

    private void loginUserAccount() {
        progressBar.setVisibility(View.VISIBLE);

        String email, password;
        email = emailTV.getText().toString();
        password = passwordTV.getText().toString();

        if (TextUtils.isEmpty(email)) {
            Toast.makeText(getApplicationContext(), "Please enter email...", Toast.LENGTH_LONG).show();
            return;
        }
        if (TextUtils.isEmpty(password)) {
            Toast.makeText(getApplicationContext(), "Please enter password!", Toast.LENGTH_LONG).show();
            return;
        }
        mAuth.signInWithEmailAndPassword(email, password)
                .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            Toast.makeText(getApplicationContext(), "Login successful!", Toast.LENGTH_LONG).show();
                            SharedPreferenceUtils.getInstance(loginActivity.this).putBoolean(AppConstants.IS_USER_LOGIN, true);

                            progressBar.setVisibility(View.GONE);
                            emailTV.setText("");
                            passwordTV.setText("");
                            Intent intent = new Intent(loginActivity.this, MainActivity.class);
                            startActivity(intent);
                        } else {
                            Toast.makeText(getApplicationContext(), "Invalid credentials", Toast.LENGTH_LONG).show();
                            progressBar.setVisibility(View.GONE);
                        }
                    }
                });
    }

    private void initializeUI() {
        emailTV = findViewById(R.id.email);
        passwordTV = findViewById(R.id.password);
        regBtn = findViewById(R.id.register);
        loginBtn = findViewById(R.id.login);
        progressBar = findViewById(R.id.progressBar);
    }
}
2-Login Activity XML code :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_vertical"
    android:orientation="vertical"
    android:padding="16dp">

    <ImageView
        android:layout_width="300dp"
        android:layout_height="200dp"
        android:layout_gravity="center"
        android:layout_marginTop="50dp"
        android:src="@drawable/youtube" />
    <com.google.android.material.textfield.TextInputLayout
        style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Email-ID"
        app:boxStrokeColor="@color/colorPrimary"
        app:boxStrokeWidthFocused="2dp"
        app:endIconMode="clear_text"
        app:endIconTint="@color/colorPrimary"
        app:hintTextColor="@color/black"
        app:startIconDrawable="@drawable/email">

        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/email"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textEmailAddress">

        </com.google.android.material.textfield.TextInputEditText>

    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.textfield.TextInputLayout
        style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Password"
        android:layout_marginTop="8dp"
        app:boxStrokeColor="@color/colorPrimary"
        app:boxStrokeWidthFocused="2dp"
        app:endIconTint="@color/colorPrimary"
        app:hintTextColor="@color/black"
        app:passwordToggleEnabled="true"
        app:startIconDrawable="@drawable/lock">

        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textPassword"
            android:transitionName="password_tran">

        </com.google.android.material.textfield.TextInputEditText>

    </com.google.android.material.textfield.TextInputLayout>
    <androidx.appcompat.widget.AppCompatButton
        android:id="@+id/login"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_gravity="center"
        android:layout_marginTop="20dp"
        android:background="@drawable/rounded_corner8"
        android:text="Log In"
        android:textAllCaps="false"
        android:textColor="@color/white"
        android:textSize="18dp"
        android:textStyle="bold" />
    <androidx.appcompat.widget.AppCompatButton
        android:id="@+id/register"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_gravity="center"
        android:layout_marginTop="20dp"
        android:background="@drawable/rounded_corner8"
        android:text="Register"
        android:textAllCaps="false"
        android:textColor="@color/white"
        android:textSize="18dp"
        android:textStyle="bold" />
    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone" />
</LinearLayout>
registration using firebase :
registration Activity :
public class registrationActivity extends AppCompatActivity {
    private EditText emailTextView, passwordTextView;
    private Button Btn23,Btn;
    private ProgressBar progressbar;
    private FirebaseAuth mAuth;
    Timer timer;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login23);
        mAuth = FirebaseAuth.getInstance();
        Btn = findViewById(R.id.btnregister44);
        // initialising all views through id defined above
        emailTextView = findViewById(R.id.email23);
        passwordTextView = findViewById(R.id.password23);
        Btn23 = findViewById(R.id.login23);
        progressbar = findViewById(R.id.progressBar23);
        if(LoginUtils.isLogin(RagistrationActivity.this)){
    Intent intent=new Intent(RagistrationActivity.this,MainActivity.class);
    startActivity(intent);
    finish();
}else {
   /* Intent intent=new Intent(loginActivity.this,RagistrationActivity.class);
    startActivity(intent);*/
}

        Btn23.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                registerNewUser();
            }
        });
    }
    private void registerNewUser() {
        // show the visibility of progress bar to show loading
        progressbar.setVisibility(View.GONE);


        // Take the value of two edit texts in Strings
        String email, password;
        email = emailTextView.getText().toString();
        password = passwordTextView.getText().toString();

        // Validations for input email and password
        if (TextUtils.isEmpty(email)) {
            Toast.makeText(getApplicationContext(),
                    "Please enter email!!",
                    Toast.LENGTH_LONG)
                    .show();
            return;
        }
        if (TextUtils.isEmpty(password)) {
            Toast.makeText(getApplicationContext(),
                    "Please enter password!!",
                    Toast.LENGTH_LONG)
                    .show();
            return;
        }
        // create new user or register new user
        mAuth
                .createUserWithEmailAndPassword(email, password)
                .addOnCompleteListener(new OnCompleteListener<AuthResult>() {

                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task)
                    {
                        if (task.isSuccessful()) {
                            Toast.makeText(getApplicationContext(),
                                    "Registration successful!",
                                    Toast.LENGTH_LONG)
                                    .show();



                            // hide the progress bar
                            progressbar.setVisibility(View.GONE);

                            SharedPreferenceUtils.getInstance(SignInActivity.this).putBoolean(AppConstants.IS_USER_LOGIN, true);
                            Intent intent = new Intent(SignInActivity.this, MainActivity.class);
                            startActivity(intent);
                            finish();

                            // if the user created intent to login activity

                        }
                        else {

                            // Registration failed
                            Toast.makeText(
                                    getApplicationContext(),
                                    "Registration failed!!"
                                            + " Please try again later",
                                    Toast.LENGTH_LONG)
                                    .show();

                            // hide the progress bar
                            progressbar.setVisibility(View.GONE);
                        }
                    }
                });

    }
}
registration Activity Xml Code :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    tools:context=".Authenticate.SignInActivity">
    <TextView
        android:layout_width="match_parent"
        android:textStyle="bold"
        android:textSize="20sp"
        android:layout_margin="15dp"
        android:padding="10dp"
        android:layout_height="wrap_content"
        android:text="Register"/>

    <!-- Edit text for email -->
    <com.google.android.material.textfield.TextInputLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:boxStrokeColor="@color/teal_200"
        app:boxStrokeWidthFocused="2dp"
        app:endIconMode="clear_text"
        app:startIconDrawable="@drawable/email_24"
        app:endIconTint="@color/teal_200"
        app:hintTextColor="@color/black"
        android:hint="Enter your Email"

        style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
        >

        <com.google.android.material.textfield.TextInputEditText
            android:layout_width="match_parent"
            android:id="@+id/email23"
            android:layout_margin="10dp"
            android:layout_height="wrap_content"
            android:transitionName="username_tran"
            android:inputType="text" />

    </com.google.android.material.textfield.TextInputLayout>

    <!-- Edit text for password -->
    <com.google.android.material.textfield.TextInputLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:textColorHint="#B9B8B8"
        app:passwordToggleEnabled="true">

        <EditText
            android:id="@+id/password23"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Password"
            android:layout_margin="10dp"
            android:inputType="textPassword"
            android:padding="16dp"
            android:textSize="18sp" />
    </com.google.android.material.textfield.TextInputLayout>
    <Button
        android:id="@+id/login23"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:background="@drawable/shape"
        android:text="Register" />

    <Button
        android:id="@+id/btnregister44"
        android:layout_width="match_parent"
        android:background="@drawable/shape"
        android:layout_margin="10dp"
        android:layout_height="wrap_content"
        android:text="LogIn" />

    <!-- ProgressBar for Loading Time -->
    <ProgressBar
        android:id="@+id/progressBar23"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:progress="25"
        android:visibility="gone" />


</LinearLayout>
we store boolean  valeu on shared preferences ,in shared preference put Boolean method present,
we put true when user is successfully  complete registration;
3-AppConstants interface for store constemt valeu
public interface AppConstants {
 
    /* Dashboard*/
    public static final int APP_EXIT_TIME = 2000;

    /*Font*/
    public static final String FONT_ROBOTO_SEMIBOLD_TTF = "font/Roboto-Medium.ttf";

    /*User*/
   /* public static final String USER_ID = "Id";
    public static final String USER_NAME = "Name";
    public static final String USER_EMAIL = "Email";
    public static final String VENDORID = "VendorID";
    public static final String ENDUSERID = "EndUserID";
    public static final String USERCITY = "City";
    public static final String USER_CART_COUNT = "TotCartItems";
    public static final String TOKEN = "token";
    public static final String AndroidId = "androidid";
    public static final String FILTERNAME = "filtername";/*

    /*login*/login constent valeu store here
    public static final String IS_USER_LOGIN = "is_user_login";
    public static final String IS_USER_REGG = "is_user_Complete_reg";

    public static final int WRITE_EXTERNAL_PERMISSION_REQUEST = 0x03;

}
if we want logout frome any Avtivity then we write this code on that particuler Activity
SharedPreferenceUtils.getInstance(MainActivity.this).clearALl();
Intent intent = new Intent(MainActivity.this, loginActivity.class);
startActivity(intent);
finish();
login utils class :
public class LoginUtils {
    public static boolean isLogin(Context context) {
        return SharedPreferenceUtils.getInstance(context).getSharedPreferences().getBoolean(AppConstants.IS_USER_LOGIN, false);
    }

}
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Rajeshbhatt12

My name is Rajesh Bhatt. I am working as a senior android developer . I have created this blog for kotlin ,java and Android Development interview questions etc..

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