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.

Firebase SDK Authentication using email password

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:

Firebase SDK Authentication using email password

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Firebase SDK Authentication using Email/Password

Firebase SDK: Authentication using email/password

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