anroid开发教程之spinner下拉列表的使用示例

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

package com.example.spinner;

import android.app.activity;
import android.os.bundle;
import android.view.view;
import android.widget.adapterview;
import android.widget.adapterview.onitemselectedlistener;
import android.widget.arrayadapter;
import android.widget.spinner;
import android.widget.toast;

public class mainactivity extends activity {

 private spinner spinner;
 

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);

  spinner = (spinner)this.findviewbyid(r.id.myspinner);
  //设置数据源
  string[] mydata = {"北京", "上海","广东","广西"};

  //声明一个arrayadapter，并将数据源与之关联起来
  arrayadapter<string> adapter = new arrayadapter<string>(this,android.r.layout.simple_spinner_item,mydata);
  //设置弹出下拉列表的风格
  adapter.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item);
  //将arrayadapter对象添加进spinner去
  spinner.setadapter(adapter);
  //添加监听器
  spinner.setonitemselectedlistener(new onitemselectedlistener() {

   @override
   public void onitemselected(adapterview<?> arg0, view arg1,
     int arg2, long arg3) {
    toast.maketext(mainactivity.this, "选择了：" + arg2, toast.length_short).show();
   }

   @override
   public void onnothingselected(adapterview<?> arg0) {
    // todo auto-generated method stub

   }
  });
 }
}