EditText etUsername, etPassword;
    Button btnLogin;
    PrefManager prefManager;

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

        //Paste disini
        prefManager = new PrefManager(this);

        etUsername = findViewById(R.id.et_username);
        etPassword = findViewById(R.id.et_password);
        btnLogin = findViewById(R.id.btn_login);

        //Cek Login User
        //Jika user pernah login

        if (prefManager.getCekLogin()) {
            startActivity(new Intent(this, ListActivity.class));
            finish();
        }

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

                String username = etUsername.getText().toString();
                String password = etPassword.getText().toString();

                //Cek Username dan Password
                if (!username.equals(prefManager.getUsername()) && !password.equals(prefManager.getPassword())) {

                    Toast.makeText(getApplicationContext(), "Password dan Username Salah ", Toast.LENGTH_LONG).show();

                } else if (!username.equals(prefManager.getUsername()) || !password.equals(prefManager.getPassword())) {

                    Toast.makeText(getApplicationContext(), "Password atau Username Salah ", Toast.LENGTH_LONG).show();

                } else {
                    prefManager.setCekLogin(PrefManager.CEK_LOGIN, true);
                    startActivity(new Intent(getApplicationContext(), ListActivity.class));
                    finish();

                }

            }
        });
    }