array.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <array name="cars">
        <item>寶馬</item>
        <item>大眾</item>
        <item>賓士</item>
    </array>
</resources>

第一種方法，使用adapter，感覺這個應該是淘汰的方法：

public class 
 
MainActivity extends AppCompatActivity {
    Spinner spinner;
    TextView textView;
    ArrayAdapter<CharSequence> arrayAdapter;
    @Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        spinner
 
=(Spinner)findViewById(R.id.spinner);
        textView=(TextView)findViewById(R.id.textView);
        arrayAdapter=ArrayAdapter.createFromResource(this,R.array.countries,android.R.layout.simple_spinner_item);
        arrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner
 
.setAdapter(arrayAdapter);
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                textView.setText("select "+adapterView.getItemAtPosition(i));
            }

            @Override
public void onNothingSelected(AdapterView<?> adapterView) {

            }
        });

    }
}

第二種，在layout中spinner元件：

<Spinner
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/spinnercar"
android:entries="@array/cars"/>