Android编程之下拉菜单Spinner控件用法示例

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>

  
  

package com.example.hello;
import java.util.ArrayList;
import java.util.List;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity implements OnItemSelectedListener{
  private TextView textView;
  private Spinner spinner;
  private List list;
  private ArrayAdapter adapter;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    textView = (TextView) findViewById(R.id.textView);
    textView.setText("您选择的城市是：");
    spinner = (Spinner) findViewById(R.id.spinner);
    list = new ArrayList();
    list.add("北京");
    list.add("上海");
    list.add("广州");
    list.add("深圳");
    adapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item,list);
    adapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(this);
  }
  @Override
  public void onItemSelected(AdapterView<&＃63;> arg0, View arg1, int arg2,long arg3) {
    String cityName = adapter.getItem(arg2);
    //String city = list.get(arg2);
    textView.setText("您选择的城市是："+cityName);
  }
  @Override
  public void onNothingSelected(AdapterView<&＃63;> arg0) {
    // TODO Auto-generated method stub
  }
}