Firebase SDK: Authentication using email/password

In our previous sections, we have learned how authentication is done using Firebase UI either for email/password or email link/no password. In this section, we will learn how the Firebase SDK is used for authentication. Firebase SDK is slightly the same as Firebase UI. Let’s see the steps for implementing email/password authentication using Firebase SDK.

Step1:

In the first step, we have to perform the preliminary steps, which are as follows:

Creating an Android project.
Creating a Firebase project.
Adding Firebase to the Android project or application, either manually or Firebase Assistance.
Adding the required libraries and JSON files.
Enable email/password sign-in method in Firebase console.

Step 2:

After performing the preliminary steps, we will create a register, login, and sign-out activities.

Step 3:

In the next step, we will code for register activity. The code is as follows:

Register

  public class MainActivity extends AppCompatActivity {    //Initialization section  EditText email,pass,username;  ProgressBar progressBar;  String userid,Email;  FirebaseAuth auth;//FirebaseAuth Instance      @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          email=(EditText)findViewById(R.id.email);          pass=(EditText)findViewById(R.id.password);          username=(EditText)findViewById(R.id.username);          progressBar=(ProgressBar)findViewById(R.id.progressBar);          auth=FirebaseAuth.getInstance();//Getting instance of FirebaseAuth      }      // Checking the current all state      @Override      public void onStart() {          super.onStart();            // if user logged in, go to sign-in screen          if (auth.getCurrentUser() != null) {              startActivity(new Intent(this, Sign_out.class));              finish();          }      }      @Override      protected void onResume(){          super.onResume();          progressBar.setVisibility(View.GONE);      }      // Register button click       public void onRegisterClicked(View view) {            //Fetching data          String emailInput = email.getText().toString().trim();          String password = pass.getText().toString().trim();          final String user = username.getText().toString().trim();            //Validation check           if (TextUtils.isEmpty(user)) {              Toast.makeText(getApplicationContext(), “Enter username!”, Toast.LENGTH_SHORT).show();              return;          }          if (TextUtils.isEmpty(emailInput)) {              Toast.makeText(getApplicationContext(), “Enter email address!”, Toast.LENGTH_SHORT).show();              return;          }          if (TextUtils.isEmpty(password)) {              Toast.makeText(getApplicationContext(), “Enter password!”, Toast.LENGTH_SHORT).show();              return;          }          if (password.length() < 6) {              Toast.makeText(getApplicationContext(), “Password too short, enter minimum 6 characters!”, Toast.LENGTH_SHORT).show();              return;          }          progressBar.setVisibility(View.VISIBLE);            //create user with email/password by adding complete listener          auth.createUserWithEmailAndPassword(emailInput, password)                  .addOnCompleteListener(MainActivity.this, new OnCompleteListener<AuthResult>() {                      @Override                      public void onComplete(@NonNull Task<AuthResult> task) {                          Toast.makeText(MainActivity.this, “createUserWithEmail:onComplete:” + task.isSuccessful(), Toast.LENGTH_SHORT).show();                          progressBar.setVisibility(View.GONE);                            // If sign-in fails, display a message to the user. If sign-in succeeds                          // the auth state listener will be notified and logic to handle the                          // signed in user can be handled in the listener.                          if (!task.isSuccessful()) {                              Toast.makeText(MainActivity.this, “Authentication failed.” + task.getException(),                                      Toast.LENGTH_LONG).show();                              Log.e(“MyTag”, task.getException().toString());                          } else {                                startActivity(new Intent(MainActivity.this, Sign_out.class));                              finish();                          }                      }                  });      }      //Login button click       public void onLoginClicked(View view) {          startActivity(new Intent(this, login.class));      }  }  

Step 4:

After that, we will code for login and sign-out activity, respectively. The codes are as follows

Login

  public class login extends AppCompatActivity {      //Declaration section      EditText email, password;      ProgressBar progressBar;      FirebaseAuth auth;        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_login);          email = (EditText) findViewById(R.id.email);          password = (EditText) findViewById(R.id.password);          progressBar = (ProgressBar) findViewById(R.id.progressBar);          auth = FirebaseAuth.getInstance();//Getting instances of FirebaseAuth       }      //Checking current user is logging or not       @Override      public void onStart() {          super.onStart();          // If user logged in, go to sign-in screen          if (auth.getCurrentUser() != null) {              startActivity(new Intent(this, Sign_out.class));              finish();          }      }        @Override      protected void onResume() {          super.onResume();          progressBar.setVisibility(View.GONE);      }      //Login button click      public void loginButtonClicked(View view) {          String Email = email.getText().toString();          final String pass = password.getText().toString();                    //Validation section          if (TextUtils.isEmpty(Email)) {              Toast.makeText(getApplicationContext(), “Enter email address!”, Toast.LENGTH_SHORT).show();              return;          }          if (TextUtils.isEmpty(pass)) {              Toast.makeText(getApplicationContext(), “Enter password!”, Toast.LENGTH_SHORT).show();              return;          }          progressBar.setVisibility(View.VISIBLE);          if (password.length() < 6) {              password.setError(“Should be greater than 6”);          }          //authenticate user with email/password by adding complete listener           auth.signInWithEmailAndPassword(Email, pass)                  .addOnCompleteListener(login.this, new OnCompleteListener<AuthResult>() {                      @Override                      public void onComplete(@NonNull Task<AuthResult> task) {                          if (!task.isSuccessful()) {                              // there was an error                              Toast.makeText(login.this, “Authentication failed.” + task.getException(),                                      Toast.LENGTH_LONG).show();                              Log.e(“MyTag”, task.getException().toString());                            } else {                              Intent intent = new Intent(login.this, Sign_out.class);                              startActivity(intent);                              finish();                          }                      }                  });      }  }  

Sign-out

  public class Sign_out extends AppCompatActivity {        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_sign_out);      }      public void onLogout(View view){          FirebaseAuth.getInstance().signOut();          startActivity(new Intent(this,MainActivity.class));      }  }  

Output:

Click here to download project

Next TopicAuthentication using Email Link

adding firebase to app features of firebase firebase firebase android studio firebase arrays firebase assistance firebase data firebase event types firebase installation firebase queries firebase security firebase tutorial what is firebase

Firebase SDK Authentication using Email/Password

Firebase SDK: Authentication using email/password

F# Tuples

Flask SQLite

You may also like