Firebase Auth not starting Activity on button click but works when close and reopen the app

Question

The Firebase Auth is not starting on HomeActivitiy on button click.

It only works where reopen the application.

public class Auth1Activity extends AppCompatActivity {

    String string_1;
    String string_2;

    private static final Boolean CHECK_EMAIL_VERIFIED = false;
    private static final String TAG = "LoginActivity";

    private FirebaseAuth firebaseAuth;
    private FirebaseAuth.AuthStateListener authStateListener;
    private FirebaseUser firebaseUser;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_auth_1);
        firebaseAuth = FirebaseAuth.getInstance();

        authStateListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            }
        };

        firebaseUser = firebaseAuth.getCurrentUser();

        if (firebaseUser != null) {
            Intent intent = new Intent(Auth1Activity.this, HomeActivity.class);
            startActivity(intent);
            finish();
        }

        final EditText auth_layout_1_edit_text_1 = findViewById(R.id.auth_layout_1_edit_text_1);
        final EditText auth_layout_1_edit_text_2 = findViewById(R.id.auth_layout_1_edit_text_2);
        Button auth_layout_1_button = findViewById(R.id.auth_layout_1_button);

        auth_layout_1_button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                string_1 = auth_layout_1_edit_text_1.getText().toString();
                string_2 = auth_layout_1_edit_text_2.getText().toString();

                if (string_1.matches("") && string_2.matches("")) {
                    auth_layout_1_edit_text_1.setError("Enter Email Address");
                    auth_layout_1_edit_text_2.setError("Enter Password");
                } else if (!string_1.matches("") && !string_2.matches("")) {
                    firebaseAuth.signInWithEmailAndPassword(string_1, string_2)
                        .addOnCompleteListener(Auth1Activity.this, new OnCompleteListener<AuthResult>() {

                        @Override
                        public void onComplete(@NonNull Task<AuthResult> task) {
                            try {
                                if (firebaseUser.isEmailVerified()) {
                                    Intent intent = new Intent(Auth1Activity.this, HomeActivity.class);                                   
                                    startActivity(intent);
                                    finish();
                                } else if (!firebaseUser.isEmailVerified()) {
                                    Toast.makeText(Auth1Activity.this, "Sign Up Error Please Try Again.", Toast.LENGTH_SHORT).show();
                                }
                            } catch (NullPointerException ignored) {

                            }
                        }
                    });
                }
            }
        });
    }

    @Override
    public void onStart() {   
        super.onStart();
        firebaseAuth.addAuthStateListener(authStateListener);    
    }

    @Override
    public void onStop() {
        super.onStop();

        if (authStateListener != null) {
            firebaseAuth.removeAuthStateListener(authStateListener);
        }
    }
}

What could be going wrong?

Answer 1

Try this way

    authStateListener = new FirebaseAuth.AuthStateListener() {

    @Override
    public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
          firebaseUser = firebaseAuth.getCurrentUser();

          if (firebaseUser != null) {

          Intent intent = new Intent(Auth1Activity.this, HomeActivity.class);
          startActivity(intent);
          finish();

        }

    }

};