public class LoginActivity extends AppCompatActivity { // Regex patterns private static final Pattern EMAIL_PATTERN = Pattern.compile("^[A-Za-z0-9-._/+?]+@[A-Za-z0-9-_]+.[A-Za-z0-9-._]+$"); private static final Pattern PASSWORD_PATTERN = Pattern.compile("^[a-zA-Z0-9]{8,20}$"); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout
