public class MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener,  View.OnClickListener {


Spinner spinner;
EditText searchFor;
Button SearchButton;
String[] itemsToChoose;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    spinner = (Spinner) findViewById(R.id.spinner);

    spinner = (Spinner)findViewById(R.id.spinner);
    ArrayAdapter<String>adapter = new ArrayAdapter<String>(MainActivity.this,
            android.R.layout.simple_spinner_item,itemsToChoose);

    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(this); //Already got an error here

    searchFor = (EditText) findViewById(R.id.input_search);
    SearchButton = (Button) findViewById(R.id.search_button);
    SearchButton.setOnClickListener(this);



    Intent intent = new Intent(this,MyIntentService.class);
    startService(intent);

    Intent intentLogin = new Intent(MainActivity.this, LoginActivityU.class);
    startActivityForResult(intentLogin, 0);
    firstLogin = false;
    sp=getSharedPreferences("JsonData", 0);
    check = sp.getString("trompim", null);



    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.addDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);
}



public void onItemSelected(AdapterView<?> parent, View v, int position, long id) {



    }
}

List<String> timeSlots = new ArrayList<String>();
ArrayAdapter<String> adp;
Spinner spinnerTime;

if (hour >=9 && hour <11){
        timeSlots.add("XYZ");
    }

    else if (hour >= 11 && hour < 13){
        Log.d(TAG ,"Condition 1");
           timeSlots.add("YZa");
           timeSlots.add("XZa");
    }
    else if ( hour >= 13 && hour <15){
        Log.d(TAG ,"Condition 2");
        timeSlots.add("YZa");
        timeSlots.add("XZa");
        timeSlots.add("YZaZ");
    }


adp = new ArrayAdapter<String>
            (this,android.R.layout.simple_dropdown_item_1line, timeSlots);
spinnerTime.setAdapter(adp);