Spinner

<Spinner
    android:id="@+id/spinner"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

public class MainActivity extends Activity {
    private Spinner spinner;
    private ArrayAdapter<String> adapter;
    private List<String> data;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        data = new ArrayList<String>();
        data.add("A");
        data.add("B");
        data.add("C");
        data.add("D");
        data.add("E");
        adapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,data);
        spinner = (Spinner) findViewById(R.id.spinner);
        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                TextView textview = (TextView) view;
                Toast.makeText(MainActivity.this, textview.getText(), Toast.LENGTH_LONG).show();                
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
                // TODO Auto-generated method stub
                
            }
        });

        /*spinner.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                TextView textview = (TextView) view;
                Toast.makeText(MainActivity.this, textview.getText(), Toast.LENGTH_LONG).show();
            }
        });*/
        /*// 创建数据
        data = new ArrayList<String>();
        data.add("楚留香");
        data.add("陆小凤");
        data.add("小李飞刀");
        data.add("绝代双骄");
        data.add("天涯明月刀");

        // 实例化adapter
        adapter = new ArrayAdapter<String>(MainActivity.this, 
                android.R.layout.simple_list_item_1, 
                data);

        // 设置spinner中的内容
        spinner = (Spinner) findViewById(R.id.spinner);
        spinner.setAdapter(adapter);
        // 设置spinner的选中事件
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                TextView textview = (TextView) view;
                Toast.makeText(MainActivity.this, textview.getText(), Toast.LENGTH_LONG).show();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
                // TODO Auto-generated method stub

            }

        });*/
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}