Android Email Password Login & Registration Using Firebase Password Authentication

 
         
package com.trickuweb.mydesign;

import android.content.Intent;
import android.os.Bundle;
import android.util.Patterns;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.basgeekball.awesomevalidation.AwesomeValidation;
import com.basgeekball.awesomevalidation.ValidationStyle;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    Button requestButton;
    TextView alreadySignin;
    EditText etEmail;
    EditText etPassword;
    private AwesomeValidation awesomeValidation;
    private FirebaseAuth mAuth;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        awesomeValidation = new AwesomeValidation(ValidationStyle.BASIC);

        requestButton = (Button) findViewById(R.id.buttonSubmit);
        alreadySignin = (TextView) findViewById(R.id.already_signin);
        requestButton.setOnClickListener(mMyListener);
        alreadySignin.setOnClickListener(mMyListener);

        etEmail = (EditText) findViewById(R.id.editTextEmail);
        etPassword = (EditText) findViewById(R.id.editPassword);
        mAuth = FirebaseAuth.getInstance();

        String regexPassword = "(?=.*[a-z])(?=.*[A-Z])(?=.*[\\d])(?=.*[~`!@#\\$%\\^&\\*\\(\\)\\-_\\+=\\{\\}\\[\\]\\|\\;:\"<>,./\\?]).{8,}";
        //adding validation to edittexts
        awesomeValidation.addValidation(this, R.id.editTextEmail, Patterns.EMAIL_ADDRESS, R.string.emailerror);
        awesomeValidation.addValidation(this, R.id.editPassword, regexPassword, R.string.passworderror);

    }
    private View.OnClickListener mMyListener = new View.OnClickListener() {
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.buttonSubmit:
                    if (awesomeValidation.validate()) {
                        createUser();
                    }
                    break;
                case R.id.already_signin:
                    Intent i = new Intent(getApplicationContext(), LoginActivity.class);
                    startActivity(i);
                    break;
                default:
                    break;
            }
        }
    };

    public void createUser(){

        String email = etEmail.getText().toString();
        String pass = etPassword.getText().toString();

        mAuth.createUserWithEmailAndPassword(email, pass)
                .addOnCompleteListener(this, new OnCompleteListener() {
                    @Override
                    public void onComplete(@NonNull Task task) {
                        if (task.isSuccessful()) {
                            Toast.makeText(MainActivity.this, "Authentication Successful.",
                                    Toast.LENGTH_SHORT).show();
                            Intent i = new Intent(getApplicationContext(), HomeActivity.class);
                            startActivity(i);
                        } else {
                            Toast.makeText(MainActivity.this, "Failed.",
                                    Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }

    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        FirebaseUser currentUser = mAuth.getCurrentUser();
        if (currentUser != null){
            Intent i = new Intent(getApplicationContext(), HomeActivity.class);
            startActivity(i);
        }
    }

}


            
         
    

 
         
package com.trickuweb.mydesign;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.util.Patterns;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.basgeekball.awesomevalidation.AwesomeValidation;
import com.basgeekball.awesomevalidation.ValidationStyle;
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;
import com.google.firebase.auth.FirebaseUser;

public class LoginActivity extends AppCompatActivity {
    Button requestButton;
    TextView alreadySignup;
    EditText etEmail;
    EditText etPassword;
    private AwesomeValidation awesomeValidation;
    private FirebaseAuth mAuth;

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

        awesomeValidation = new AwesomeValidation(ValidationStyle.BASIC);

        requestButton = (Button) findViewById(R.id.buttonLogin);
        alreadySignup = (TextView) findViewById(R.id.already_signup);
        requestButton.setOnClickListener(mMyListener);
        alreadySignup.setOnClickListener(mMyListener);

        etEmail = (EditText) findViewById(R.id.editTextEmail);
        etPassword = (EditText) findViewById(R.id.editPassword);
        mAuth = FirebaseAuth.getInstance();

        awesomeValidation.addValidation(this, R.id.editTextEmail, Patterns.EMAIL_ADDRESS, R.string.emailerror);
    }
    private View.OnClickListener mMyListener = new View.OnClickListener() {
        public void onClick(View v) {
            switch (v.getId() /*to get clicked view id**/) {
                case R.id.buttonLogin:
                    if (awesomeValidation.validate()) {
                        Toast.makeText(LoginActivity.this, "Validation OK",
                                Toast.LENGTH_SHORT).show();
                        LoginUser();
                    }
                    break;
                case R.id.already_signup:
                    Intent i = new Intent(getApplicationContext(), MainActivity.class);
                    startActivity(i);
                    break;
                default:
                    break;
            }
        }
    };

    public void LoginUser(){

        String email = etEmail.getText().toString();
        String pass = etPassword.getText().toString();

        mAuth.signInWithEmailAndPassword(email, pass)
                .addOnCompleteListener(this, new OnCompleteListener() {
                    @Override
                    public void onComplete(@NonNull Task task) {
                        if (task.isSuccessful()) {
                            Toast.makeText(LoginActivity.this, "Login Successful.",
                                    Toast.LENGTH_SHORT).show();
                            Intent i = new Intent(getApplicationContext(), HomeActivity.class);
                            startActivity(i);
                        } else {
                            Toast.makeText(LoginActivity.this, "Failed. "+task.getException().getMessage(),
                                    Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }

}


            
         
    

 
         
package com.trickuweb.mydesign;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import com.google.firebase.auth.FirebaseAuth;

import androidx.appcompat.app.AppCompatActivity;

public class HomeActivity extends AppCompatActivity {
    Button btnLogout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        btnLogout = (Button) findViewById(R.id.btn_logout);

        btnLogout.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                FirebaseAuth.getInstance().signOut();
                Intent i = new Intent(getApplicationContext(), LoginActivity.class);
                startActivity(i);
            }
        });
    }

}


            
         
    

 
         
			

			<?xml version="1.0" encoding="utf-8"?>
			<androidx.constraintlayout.widget.ConstraintLayout 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"
				tools:context=".HomeActivity">

				<Button
					android:id="@+id/btn_logout"
					android:layout_width="wrap_content"
					android:layout_height="wrap_content"
					android:text="Logout"
					app:layout_constraintBottom_toBottomOf="parent"
					app:layout_constraintEnd_toEndOf="parent"
					app:layout_constraintStart_toStartOf="parent"
					app:layout_constraintTop_toTopOf="parent" />
			</androidx.constraintlayout.widget.ConstraintLayout>

		
            
         
    

 
         
			

			dependencies {
				implementation fileTree(dir: 'libs', include: ['*.jar'])
				implementation 'androidx.appcompat:appcompat:1.1.0'
				implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
				testImplementation 'junit:junit:4.12'
				androidTestImplementation 'androidx.test.ext:junit:1.1.1'
				androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
				implementation 'com.google.android.material:material:1.1.0'
				implementation 'com.basgeekball:awesome-validation:4.2'
				implementation 'com.google.firebase:firebase-analytics:17.2.2'
				implementation 'com.google.firebase:firebase-auth:19.3.1'
			}

		
            
         
    

 
         
			

    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.2'
        classpath 'com.google.gms:google-services:4.3.3'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
		
            
         
    

 
         
			

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.trickuweb.mydesign">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".HomeActivity">
        <activity
            android:name=".LoginActivity"
            android:theme="@style/Theme.AppCompat.NoActionBar" />
        <activity
            android:name=".MainActivity"
            android:theme="@style/Theme.AppCompat.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>