EditText edtUsername;
    EditText edtPassword;
    Button btnLogin;

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

        edtUsername = findViewById(R.id.edt_username);
        edtPassword = findViewById(R.id.edt_password);
        btnLogin = findViewById(R.id.btn_login);


        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                login();
            }
        });
    }

    private String getValueFrom(EditText editText) {
        return editText.getText().toString();
    }

    private boolean validateAllInput() {
        String username = getValueFrom(usernameEd);
        if (username.isEmpty()) {
            usernameEd.setError("Username masih kosong");
            return false;
        }

        String password = getValueFrom(passwordEd);
        if (password.isEmpty()) {
            passwordEd.setError("Password masih kosong");
            return false;
        }

        return true;
    }

    private void login() {
        if (!validateAllInput()) return;

        String username = getValueFrom(usernameEd);
        String password = getValueFrom(passwordEd);
        boolean granted = username.equals("admin") &&
                password.equals("admin");

        if (granted) {
            Intent intent = new Intent(this, ListActivty.class);
            startActivity(intent);
        } else {
            Toast.makeText(this, "Username/Password Salah", Toast.LENGTH_LONG)
                    .show();
        }
    }

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