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How to Register and Login in Android using Firebase ?

CodingWithShubhamCodingWithShubham October 16, 2019

How to Register and Login in Android using Firebase ?


Hi..  In this tutorial we will learn about firebase Authentication with Email and Password. In this tutorial first we Register a user using email and then a email will sent to Email ID of that user then user have to verify that email otherwise, the user is unable to login into their app.



Output:-







Step 1:- Create a new Android project.

Step 2:- Connect your Project with firebase. You can connect your project with android studio tools and manually 

Step 3:- To connect your project with firebase with Android Studio Click on Tools and then select Option Firebase. 

Step 4:-  Select Authentication and click on email and password authentication. 




Step 5:- Click on Connect to Firebase and add some necessary libraries in your android project.







Now your Android project is Connected with the Firebase its time to write some code Let's get started

Create Login activity design i named it as activity_main you can give whatever you want to give not necessary.

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"

    tools:context=".MainActivity">

    <ProgressBar
        android:id="@+id/ProgressBarr"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_centerInParent="true"/>

    <TextView
        android:id="@+id/TV_PleaseWait"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="PleaseWait..."
        android:textSize="25sp"
        android:layout_alignBottom="@id/ProgressBarr"
        android:layout_alignRight="@id/ProgressBarr"/>


    <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"
        tools:context=".MainActivity"
        android:orientation="vertical"
        android:padding="30dp">

        <!--<ImageView
            android:id="@+id/ImageView"
            android:layout_width="match_parent"
            android:layout_height="200dp"
            android:src="@drawable/ic_account_circle_black_24dp"
            android:padding="15dp"/>-->

        <com.google.android.material.textfield.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:focusable="true"
            android:focusableInTouchMode="true"
            android:layout_marginTop="5dp">

            <EditText
                android:id="@+id/UserEmail"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Email"
                android:ems="10"
                android:inputType="text"
                android:textSize="22sp"
                />

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

        <com.google.android.material.textfield.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:focusable="true"
            android:focusableInTouchMode="true"
            android:layout_marginTop="5dp"
            app:passwordToggleEnabled="true">

            <EditText
                android:id="@+id/UserPassword"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Password"
                android:ems="10"
                android:inputType="textPassword"
                android:textSize="22sp"
                />

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

        <Button
            android:id="@+id/Btn_Login"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Login"
            android:textSize="22sp"
            android:background="@drawable/btnbg"
            android:layout_marginTop="40dp"
            android:textColor="#fff"/>

        <Button
            android:id="@+id/Register_Here"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Register"
            android:background="@drawable/btnbg"
            android:textSize="22sp"
            android:layout_marginTop="40dp"
            android:textColor="#fff"
            />

    </LinearLayout>

</RelativeLayout>






Now Create Register Activity for your Registration.


activity_register.xml





<?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"
    android:orientation="vertical"
    android:padding="30dp"
    tools:context=".RegisterActivity">

    <com.google.android.material.textfield.TextInputLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:layout_marginTop="5dp">

        <EditText
            android:id="@+id/et_FullName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Full Name"
            android:ems="10"
            android:inputType="text"
            android:textSize="22sp"
            />

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



    <com.google.android.material.textfield.TextInputLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:focusable="true"
        android:layout_marginTop="5dp"
        android:focusableInTouchMode="true"
        >

        <EditText
            android:id="@+id/et_Email"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Email"
            android:ems="10"
            android:inputType="text"
            android:textSize="22sp"
            />

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

    <com.google.android.material.textfield.TextInputLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:focusable="true"
        android:layout_marginTop="5dp"
        app:passwordToggleEnabled="true"
        android:focusableInTouchMode="true"
        >

        <EditText
            android:id="@+id/et_Password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Password"
            android:ems="10"
            android:inputType="textPassword"
            android:textSize="22sp"
            />

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

    <com.google.android.material.textfield.TextInputLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:focusable="true"
        android:layout_marginTop="5dp"
        android:focusableInTouchMode="true"
        app:passwordToggleEnabled="true"
        >

        <EditText
            android:id="@+id/et_confirmPass"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Confirm Password"
            android:ems="10"
            android:inputType="textPassword"
            android:textSize="22sp"
            />

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


    <Button
        android:id="@+id/Register_Btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Register"
        android:textSize="22sp"
        android:layout_marginTop="40dp"
        android:background="@drawable/btnbg"
        android:textColor="#fff"/>


</LinearLayout>



Create Profile Activity.

activity_profile.xml







<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"
    tools:context=".ProfileActivity">

    <TextView
        android:id="@+id/Tv_Text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Profile Activity"
        android:textSize="40sp"
        android:layout_centerInParent="true"/>

    <Button
        android:id="@+id/LogOut_Btn"
        android:layout_width="160dp"
        android:layout_height="60dp"
        android:text="LogOut"
        android:textAllCaps="false"
        android:layout_below="@+id/Tv_Text"
        android:layout_centerHorizontal="true"/>

    <ProgressBar
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@id/LogOut_Btn"
        android:layout_centerHorizontal="true"
    android:id="@+id/signoutProgressBar"
    />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Signing Out..."
        android:textSize="20sp"
        android:textColor="#000"
        android:layout_alignBottom="@id/signoutProgressBar"
        android:layout_alignRight="@id/signoutProgressBar"
        android:id="@+id/textSignout"
        />

</RelativeLayout>




Now Write some java code for functionality.

MainActivity.java



public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";

    private Button mRegisterBtn, mLoginBtn;
    private EditText mEmail, mPassword;
    private ProgressBar mProgressBar;
    private TextView mPleaseWait;
    private Context mcontext;

    private FirebaseAuth mAuth;
    private FirebaseAuth.AuthStateListener mAurhListner;

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

        mRegisterBtn = findViewById(R.id.Register_Here);
        mLoginBtn = findViewById(R.id.Btn_Login);
        mEmail = findViewById(R.id.UserEmail);
        mPassword = findViewById(R.id.UserPassword);
        mProgressBar = findViewById(R.id.ProgressBarr);
        mPleaseWait = findViewById(R.id.TV_PleaseWait);

        mcontext = MainActivity.this;

        mProgressBar.setVisibility(View.GONE);
        mPleaseWait.setVisibility(View.GONE);
        setUPFirebaseAuth();

        mRegisterBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent intet = new Intent(MainActivity.this, RegisterActivity.class);
                startActivity(intet);
            }
        });

        mLoginBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String email = mEmail.getText().toString();
                String password = mPassword.getText().toString();

                if (TextUtils.isEmpty(email)) {

                    Toast.makeText(MainActivity.this, "Please Enter Username", Toast.LENGTH_SHORT).show();
                    return;
                }

                if (TextUtils.isEmpty(password)) {

                    Toast.makeText(MainActivity.this, "Please Enter Username", Toast.LENGTH_SHORT).show();
                    return;
                }

                mProgressBar.setVisibility(View.VISIBLE);
                mPleaseWait.setVisibility(View.VISIBLE);

                mAuth.signInWithEmailAndPassword(email, password)
                        .addOnCompleteListener(MainActivity.this, new OnCompleteListener<AuthResult>() {
                            @Override
                            public void onComplete(@NonNull Task<AuthResult> task) {
                                if (task.isSuccessful()) {
                                    // Sign in success, update UI with the signed-in user's information
                                    Log.d(TAG, "signInWithEmail:success");

                                    try{
                                        FirebaseUser user = mAuth.getCurrentUser();

                                        if (user.isEmailVerified()){
                                            Log.e(TAG, "onComplete: Email Verified ");
                                            Toast.makeText(mcontext, "Login Sucessfully", Toast.LENGTH_SHORT).show();

                                            Intent intento = new Intent(MainActivity.this, ProfileActivity.class );
                                            startActivity(intento);
                                        }else {
                                            Toast.makeText(mcontext, "Email Not Verified\n Check your Email Inbox", Toast.LENGTH_SHORT).show();

                                        }
                                    } catch (NullPointerException e){

                                        Log.e(TAG, "onComplete: NullPointerException " + e.getMessage() );
                                    }


                                    /*  FirebaseUser user = mAuth.getCurrentUser();*/
                                    mProgressBar.setVisibility(View.GONE);
                                    mPleaseWait.setVisibility(View.GONE);

                                } else {
                                    // If sign in fails, display a message to the user.
                                    Log.w(TAG, "signInWithEmail:failure", task.getException());
                                    Toast.makeText(MainActivity.this, "Authentication failed.", Toast.LENGTH_SHORT).show();

                                }


                            }
                        });

            }
        });

        if (mAuth.getCurrentUser() !=null){

            Intent intento = new Intent(MainActivity.this, ProfileActivity.class );
            startActivity(intento);


        }

    }

    private void setUPFirebaseAuth() {

        mAuth = FirebaseAuth.getInstance();
        mAurhListner = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {

                FirebaseUser user = firebaseAuth.getCurrentUser();

                if (user != null) {

                    Log.d(TAG, "onAuthStateChanged: signed in " + user.getUid());
                } else {

                    Log.d(TAG, "onAuthStateChanged: signed out");
                }
            }
        };
    }

    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        mAuth.addAuthStateListener(mAurhListner);
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (mAurhListner !=null){

            mAuth.removeAuthStateListener(mAurhListner);
        }
    }
}




Create New Java Class Named FirebaseMethods the name will be anything.



public class FirebaseMethods {

    private static final String TAG="FirebaseMethods";

    private FirebaseAuth mAuth;
    private FirebaseAuth.AuthStateListener mAurhListner;
    private String userID;
    private Context mContext;
    private FirebaseDatabase mFirebaseDatabase;
    private DatabaseReference mDatabaseRefrence;

    public FirebaseMethods(Context context){
        mAuth = FirebaseAuth.getInstance();
        mContext = context;


        if (mAuth.getCurrentUser() != null){

            userID = mAuth.getCurrentUser().getUid();
        }

    }

    public void RegisterNewUser(String fullname, String email, String password, String confirmpass){

        mAuth.createUserWithEmailAndPassword(email, password)
                .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {

                            sendVerificationEmail();
                            // Sign in success, update UI with the signed-in user's information
                            Log.d(TAG, "createUserWithEmail:success");


                        } else {
                            // If sign in fails, display a message to the user.
                            Log.w(TAG, "createUserWithEmail:failure", task.getException());
                            Toast.makeText(mContext, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();

                        }
                    }
                });
    }

    public void sendVerificationEmail(){

        FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();

        if (user !=null){

            user.sendEmailVerification()
                    .addOnCompleteListener(new OnCompleteListener<Void>() {
                        @Override
                        public void onComplete(@NonNull Task<Void> task) {

                            if (task.isSuccessful()){

                                Toast.makeText(mContext, "Check Your Email Inbox\n And Confirm your password", Toast.LENGTH_SHORT).show();
                            }
                            else {
                                Toast.makeText(mContext, "could not send verification email", Toast.LENGTH_SHORT).show();
                            }
                        }
                    });
        }
    }
}



Create Register Activity.

RegisterActivity.java


public class RegisterActivity extends AppCompatActivity {

    private static final String TAG="RegisterActivity";

    private EditText mFullName, mEmail, mPassword, mConfirmPass;
    private Button mRegister_Btn;
    private Context mContext;

    //Firebase
    FirebaseAuth mAuth;
    FirebaseAuth.AuthStateListener mAurhListner;
    FirebaseDatabase mFirebaseDatabase;
    DatabaseReference mDatabaseRefrence;
    FirebaseMethods firebaseMethods;

    private String append = "";

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

        mContext = RegisterActivity.this;
        firebaseMethods = new FirebaseMethods(mContext);

        mFullName = findViewById(R.id.et_FullName);
        mEmail = findViewById(R.id.et_Email);
        mPassword = findViewById(R.id.et_Password);
        mConfirmPass = findViewById(R.id.et_confirmPass);
        mRegister_Btn = findViewById(R.id.Register_Btn);

        Init();

    }

    public void Init(){


        mRegister_Btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                String fullname = mFullName.getText().toString();
                String email = mEmail.getText().toString();
                String password = mPassword.getText().toString();
                String confirmpass = mConfirmPass.getText().toString();


                if (TextUtils.isEmpty(email)) {

                    Toast.makeText(mContext, "Please Enter Your Email", Toast.LENGTH_SHORT).show();
                    return;
                }

                if (TextUtils.isEmpty(password)) {

                    Toast.makeText(mContext, "Please Enter Your Password", Toast.LENGTH_SHORT).show();

                    if (password.length() < 6) {

                        Toast.makeText(mContext, "Password Should be 6 Characters", Toast.LENGTH_SHORT).show();
                    }
                    return;
                }

                if (TextUtils.isEmpty(confirmpass)) {

                    Toast.makeText(mContext, "Please ConfirmYour Password", Toast.LENGTH_SHORT).show();

                    if (!password.equals(confirmpass)) {

                        Toast.makeText(mContext, "Match Doen't Match", Toast.LENGTH_SHORT).show();
                    }
                    return;
                }

                firebaseMethods.RegisterNewUser(fullname, email, password, confirmpass);

                startActivity(new Intent(RegisterActivity.this, MainActivity.class));
                finish();
            }

        });
    }
}



Create Profile Activity

ProfileActivity.java



public class ProfileActivity extends AppCompatActivity {

    private static final String TAG = "ProfileActivity";

    private Button mLogOut;
    private ProgressBar mProgressbar;
    private TextView tvsignout;

    private FirebaseAuth mAuth;
    private FirebaseAuth.AuthStateListener mAuthListner;



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

        mLogOut = findViewById(R.id.LogOut_Btn);
        tvsignout = findViewById(R.id.textSignout);
        mProgressbar = findViewById(R.id.signoutProgressBar);

        mProgressbar.setVisibility(View.GONE);
        tvsignout.setVisibility(View.GONE);

        setUPFirebaseAuth();

        mLogOut.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent intent = new Intent(ProfileActivity.this, MainActivity.class);
                startActivity(intent);

                mProgressbar.setVisibility(View.VISIBLE);
                tvsignout.setVisibility(View.VISIBLE);

                mAuth.signOut();
            }
        });
    }

    private void setUPFirebaseAuth() {

        mAuth = FirebaseAuth.getInstance();
        mAuthListner = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {

                FirebaseUser user = firebaseAuth.getCurrentUser();

                if (user != null) {

                    Log.d(TAG, "onAuthStateChanged: signed in " + user.getUid());
                } else {

                    Log.d(TAG, "onAuthStateChanged: signed out");
                }
            }
        };
    }

    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        mAuth.addAuthStateListener(mAuthListner);
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (mAuthListner !=null){

            mAuth.removeAuthStateListener(mAuthListner);
        }
    }
}



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CodingWithShubham
Posted by CodingWithShubham
Hey...! I'm Shubham from Ludhiana, Punjab, India. I'm Android Developer. I create and customize many projects.Often i had faced many problem or error while writing the codes so here in this blog i provides a little bit code for you guys, that may help you out from many error.

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