Android编程开发之Spinner组件用法

本文实例讲述了android编程开发之spinner组件用法。分享给大家供大家参考，具体如下：

spinner组件组要用显示一个下拉列表，在使用中需要用到适配器adapter，下面是一个该组件的使用示例

首先是布局文件main.xml：

<?xml version="1.0" encoding="utf-8"?> 
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:orientation="vertical" android:layout_width="fill_parent" 
 android:layout_height="fill_parent"> 
 <spinner android:id="@+id/spinner1" android:layout_width="fill_parent" 
  android:layout_height="wrap_content" /> 
 <spinner android:id="@+id/spinner2" android:layout_width="fill_parent" 
  android:layout_height="wrap_content" android:layout_margintop="20dp"/>
</linearlayout> 

由于用到simpadapter所以要写子项item的布局如下 item.xml：

<?xml version="1.0" encoding="utf-8"?> 
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:orientation="horizontal" android:layout_width="fill_parent" 
 android:layout_height="wrap_content"> 
 <imageview android:id="@+id/ivlogo" android:layout_width="60dp" 
  android:layout_height="60dp" android:src="@drawable/icon" 
  android:paddingleft="10dp" /> 
 <textview android:id="@+id/tvapplicationname" android:textcolor="#000" 
  android:layout_width="wrap_content" android:layout_height="fill_parent" 
  android:textsize="16dp" android:gravity="center_vertical" 
  android:paddingleft="10dp" /> 
</linearlayout> 

下面是代码：

import java.util.arraylist; 
import java.util.hashmap; 
import java.util.list; 
import java.util.map; 
import android.app.activity; 
import android.app.alertdialog; 
import android.os.bundle; 
import android.view.view; 
import android.widget.adapterview; 
import android.widget.arrayadapter; 
import android.widget.simpleadapter; 
import android.widget.spinner; 
import android.widget.adapterview.onitemselectedlistener; 
public class main extends activity 
{ 
 @override 
 public void oncreate(bundle savedinstancestate) 
 { 
  super.oncreate(savedinstancestate); 
  setcontentview(r.layout.main); 
  //获取对象 
  spinner spinner1 = (spinner) findviewbyid(r.id.spinner1); 
  string[] applicationnames = new string[] 
  { "多功能日历", "eoemarket客户端", "耐玩的重力消砖块", "白社会", "程序终结者" }; 
  arrayadapter<string> aaadapter = new arrayadapter<string>(this, 
    android.r.layout.simple_spinner_item, applicationnames); 
  // 将如下代码可以使列表项带radiobutton组件 
  // aaadapter.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item); 
  spinner1.setadapter(aaadapter); 
  spinner spinner2 = (spinner) findviewbyid(r.id.spinner2); 
  final list<map<string, object>> items = new arraylist<map<string, object>>(); 
  map<string, object> item1 = new hashmap<string, object>(); 
  item1.put("ivlogo", r.drawable.calendar); 
  item1.put("tvapplicationname", "多功能日历"); 
  map<string, object> item2 = new hashmap<string, object>(); 
  item2.put("ivlogo", r.drawable.eoemarket); 
  item2.put("tvapplicationname", "eoemarket客户端"); 
  items.add(item1); 
  items.add(item2); 
  simpleadapter simpleadapter = new simpleadapter(this, items, 
    r.layout.item, new string[] 
    { "ivlogo", "tvapplicationname" }, new int[] 
    { r.id.ivlogo, r.id.tvapplicationname }); 
  spinner2.setadapter(simpleadapter); 
  //为spinner2加上监听事件 
  spinner2.setonitemselectedlistener(new onitemselectedlistener() 
  { 
   @override 
   public void onitemselected(adapterview<?> parent, view view, 
     int position, long id) 
   { 
     new alertdialog.builder(view.getcontext()).settitle( 
       items.get(position).get("tvapplicationname") 
         .tostring()).seticon( 
       integer.parseint(items.get(position).get("ivlogo")
         .tostring())).show(); 
   } 
   @override 
   public void onnothingselected(adapterview<?> parent) 
   {
   } 
  }); 
 } 
}

希望本文所述对大家android程序设计有所帮助。