Spinner - <#Android>

*cấu hình Spiner dạng cơ bản  
code :

public class MainActivity extends AppCompatActivity {
    Spinner spinner;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        spinner = (Spinner)findViewById(R.id.spinner);
        List list = new ArrayList();
        list.add("thong tin1");
        list.add("thong tin2");
        list.add("thong tin3");
        list.add("thong tin4");
        list.add("thong tin5");
        ArrayAdapter dataAdapter = new ArrayAdapter(
                this,
                android.R.layout.simple_spinner_item,
                list
        );
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(dataAdapter);
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override            

            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                Toast.makeText(
                        MainActivity.this,
                        "" + i,
                        Toast.LENGTH_LONG                ).show();
            }

            @Override           

            public void onNothingSelected(AdapterView<?> adapterView) {

            }
        });
    }
}