下拉菜单 Spinner 简单纯字符串版

下拉菜单 Spinner 简单纯字符串版

public class MainActivity extends Activity implements AdapterView.OnItemSelectedListener{
    private Spinner spinner;
    private TextView text;

    private List<String> data = new ArrayList<String>();
    private ArrayAdapter<String> adapter;
    private String[] place    = {"北京","上海","广东","苏州"};

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

        //注册控件
        spinner = (Spinner)findViewById(R.id.spinner);
        text    = (TextView)findViewById(R.id.text);

        //数据源
        for(int i = 0; i < place.length ; i++){
            data.add(place[i]);
        }

        //适配器
        adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,data);
        adapter.setDropDownViewResource(R.layout.buju);

        //与适配器绑定
        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(this);

    }

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

//方法1：通过ArrayAdapter 提供的getItem（position） 直接获取位置内容
        String cityname = adapter.getItem(position);
        text.setText("您选择的地方是：" + cityname);
//方法2：在一开始初始化数据源 时 用数组来定义 通过数组下标配合position来找
//        text.setText("您选择的地方是：" + place[position]);
//方法3：通过list提供的  list.get(position) 直接获取位置内容
//        String cityname = data.get(position);
//        text.setText("您选择的地方是：" + cityname);
    }