Firebase Email-Password Auth

activity_home.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_margin="10dp"
    tools:context=".HomeActivity">

    <TextView
        android:id="@+id/user_name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textAlignment="center"
        android:layout_marginTop="65dp"
        android:text="Home Activity" />
    <TextView
        android:id="@+id/user_email"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/user_name"
        android:textAlignment="center"
        android:text="Home Activity" />

    <Button
        android:id="@+id/button"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/user_email"
        android:onClick="logoutProcess"
        android:text="Logout" />
</RelativeLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:background="#ffffff"
    tools:context=".MainActivity">


    <ImageView
        android:id="@+id/logo"
        android:layout_width="match_parent"
        android:layout_height="180dp"
        android:layout_marginTop="45dp"
        app:srcCompat="@drawable/logo" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/logo"
        android:layout_marginTop="12dp"
        android:text="Please login with your account"
        android:textAlignment="center"
        android:textColor="#cccccc"
        android:textSize="24dp"
        android:textStyle="bold" />

    <EditText
        android:id="@+id/emailText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/textView"
        android:layout_marginStart="12dp"
        android:layout_marginTop="12dp"
        android:layout_marginEnd="12dp"
        android:layout_marginBottom="12dp"
        android:background="#dddddd"
        android:hint="Email address"
        android:inputType="textEmailAddress"
        android:padding="20dp" />

    <EditText
        android:id="@+id/passwordText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/emailText"
        android:layout_marginStart="12dp"
        android:layout_marginTop="12dp"
        android:layout_marginEnd="12dp"
        android:layout_marginBottom="12dp"
        android:background="#dddddd"
        android:hint="Password"
        android:inputType="textPassword"
        android:padding="20dp" />

    <Button
        android:id="@+id/LoginButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/passwordText"
        android:layout_marginStart="12dp"
        android:layout_marginLeft="12dp"
        android:layout_marginTop="12dp"
        android:layout_marginEnd="12dp"
        android:layout_marginRight="12dp"
        android:layout_marginBottom="12dp"
        android:background="#8BC34A"
        android:onClick="loginProses"
        android:text="Login" />

    <Button
        android:id="@+id/SignUpButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/LoginButton"
        android:layout_marginStart="12dp"
        android:layout_marginLeft="12dp"
        android:layout_marginTop="12dp"
        android:layout_marginEnd="12dp"
        android:layout_marginRight="12dp"
        android:layout_marginBottom="12dp"
        android:background="#4CAF50"
        android:onClick="signUpProsses"
        android:text="Sign Up" />
</RelativeLayout>

activity_sign_up.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:background="@android:color/background_light"
    tools:context=".SignUpActivity">

    <ImageView
        android:id="@+id/logo"
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:layout_marginTop="25dp"
        app:srcCompat="@drawable/logo" />
    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/logo"
        android:layout_marginTop="12dp"
        android:text="Fill this form to register"
        android:textAlignment="center"
        android:textColor="#cccccc"
        android:textSize="24dp"
        android:textStyle="bold" />
    <EditText
        android:id="@+id/user_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/textView"
        android:layout_marginStart="12dp"
        android:layout_marginTop="12dp"
        android:layout_marginEnd="12dp"
        android:layout_marginBottom="12dp"
        android:background="#dddddd"
        android:hint="Your Name"
        android:inputType="text"
        android:padding="20dp" />
    <EditText
        android:id="@+id/user_email"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/user_name"
        android:layout_marginStart="12dp"
        android:layout_marginTop="12dp"
        android:layout_marginEnd="12dp"
        android:layout_marginBottom="12dp"
        android:background="#dddddd"
        android:hint="Email address"
        android:inputType="textEmailAddress"
        android:padding="20dp" />

    <EditText
        android:id="@+id/user_password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/user_email"
        android:layout_marginStart="12dp"
        android:layout_marginTop="12dp"
        android:layout_marginEnd="12dp"
        android:layout_marginBottom="12dp"
        android:background="#dddddd"
        android:hint="Password"
        android:inputType="textPassword"
        android:padding="20dp" />

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/user_password"
        android:layout_marginStart="12dp"
        android:layout_marginTop="12dp"
        android:layout_marginEnd="12dp"
        android:layout_marginBottom="12dp"
        android:onClick="register"
        android:text="Save" />

</RelativeLayout>

HomeActivity.java

package com.vokasi.firebaseauthexample;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

import org.w3c.dom.Text;

public class HomeActivity extends AppCompatActivity {

    private TextView user_name;
    private TextView user_email;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        user_name = (TextView) findViewById(R.id.user_name);
        user_email = (TextView) findViewById(R.id.user_email);
        FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
        if (user != null) {
            String name = user.getDisplayName();
            String email = user.getEmail();
            user_name.setText(name);
            user_email.setText(email);
        }
    }

    public void logoutProcess(View view){
        FirebaseAuth.getInstance().signOut();
        Intent loginpage = new Intent(HomeActivity.this, MainActivity.class);
        startActivity(loginpage);
    }
}

MainActivity.java

package com.vokasi.firebaseauthexample;

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

import android.content.Intent;
import android.os.Bundle;
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;
import com.google.firebase.auth.FirebaseUser;

public class MainActivity extends AppCompatActivity {
    private FirebaseAuth mAuth;
    private EditText email;
    private EditText password;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        email = (EditText) findViewById(R.id.emailText);
        password  = (EditText) findViewById(R.id.passwordText);
        mAuth = FirebaseAuth.getInstance();
    }

    @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 homepage = new Intent(MainActivity.this, HomeActivity.class);
            startActivity(homepage);
            finish();
        }

    }

    public void loginProses(View view){
        mAuth.signInWithEmailAndPassword(email.getText().toString(),password.getText().toString()).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                if (task.isSuccessful()){
                    Toast.makeText(MainActivity.this, "Login Successfull", Toast.LENGTH_LONG).show();
                    FirebaseUser user = mAuth.getCurrentUser();
                    Intent homepage = new Intent(MainActivity.this, HomeActivity.class);
                    startActivity(homepage);
                }else{
                    Toast.makeText(MainActivity.this, "Authentication failed.",
                            Toast.LENGTH_LONG).show();
                }
            }
        });
    }

    public void signUpProsses(View view){
        Intent signupPage = new Intent(MainActivity.this, SignUpActivity.class);
        startActivity(signupPage);
    }
}

SignUpActivity.java

package com.vokasi.firebaseauthexample;

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

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
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;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.UserProfileChangeRequest;

public class SignUpActivity extends AppCompatActivity {
    private FirebaseAuth mAuth;
    EditText user_name;
    EditText user_email;
    EditText user_password;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sign_up);

        user_name = (EditText) findViewById(R.id.user_name);
        user_email = (EditText) findViewById(R.id.user_email);
        user_password = (EditText) findViewById(R.id.user_password);
        mAuth = FirebaseAuth.getInstance();
    }

    public void register(View view){

        String email  = user_email.getText().toString();
        String password = user_password.getText().toString();
        mAuth.createUserWithEmailAndPassword(email, password)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {

                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            FirebaseUser user = mAuth.getCurrentUser();
                            UserProfileChangeRequest profileUpdates = new UserProfileChangeRequest.Builder()
                                    .setDisplayName(user_name.getText().toString())
                                    .setPhotoUri(Uri.parse("https://randomuser.me/api/portraits/men/76.jpg"))
                                    .build();

                            user.updateProfile(profileUpdates)
                                    .addOnCompleteListener(new OnCompleteListener<Void>() {
                                        @Override
                                        public void onComplete(@NonNull Task<Void> task) {
                                            if (task.isSuccessful()) {
                                                Toast.makeText(SignUpActivity.this, "Data updated", Toast.LENGTH_SHORT).show();
                                                Intent homepage = new Intent(SignUpActivity.this, HomeActivity.class);
                                                startActivity(homepage);
                                                finish();
                                            }
                                        }
                                    });

                        } else {
                            Toast.makeText(SignUpActivity.this, "Registration failed.",
                                    Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }
}