Android编程开发之Spinner控件用法实例分析

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

下拉列表 spinner，spinner是一个每次只能选择所有项的一个项的控件。它的项来自于与之相关联的适配器中。

spinner的使用，可以极大提高用户的体验性。当需要用户选择的时候，可以提供一个下拉列表将所有可选的项列出来。供用户选择。

一、使用数组作为数据源

布局文件：

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" 
 xmlns:tools="http://schemas.android.com/tools" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 android:paddingbottom="@dimen/activity_vertical_margin" 
 android:paddingleft="@dimen/activity_horizontal_margin" 
 android:paddingright="@dimen/activity_horizontal_margin" 
 android:paddingtop="@dimen/activity_vertical_margin" 
 tools:context=".mainactivity" > 
 <spinner 
  android:id="@+id/spinner1" 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:layout_alignparentleft="true" 
  android:layout_alignparenttop="true" /> 
</relativelayout>

mainactivity.java

package com.example.lesson16_spinner; 
import java.util.arraylist; 
import java.util.hashmap; 
import java.util.list; 
import java.util.map; 
import android.app.activity; 
import android.os.bundle; 
import android.view.menu; 
import android.view.view; 
import android.widget.adapterview; 
import android.widget.arrayadapter; 
import android.widget.simpleadapter; 
import android.widget.spinner; 
import android.widget.toast; 
public class mainactivity extends activity { 
 // 声明spinner对象 
 private spinner spinner; 
 @override 
 protected void oncreate(bundle savedinstancestate) { 
  super.oncreate(savedinstancestate); 
  setcontentview(r.layout.activity_main); 
  spinner = (spinner) findviewbyid(r.id.spinner1); 
  //使用数组作为数据源 
  final string arr[] = new string[] { "周一", "周二", "周三", "周四", "周五", "周六", "周七" }; 
  // adpater对象 
  arrayadapter<string> arrayadapter = new arrayadapter<string>(this, android.r.layout.simple_spinner_item, arr); 
  list<map<string, object>> data = new arraylist<map<string, object>>();
  map<string, object> map = new hashmap<string, object>(); 
  map.put("logo", r.drawable.ic_launcher); 
  map.put("text", "xxxx说明操作"); 
  map<string, object> map2 = new hashmap<string, object>(); 
  map2.put("logo", r.drawable.ic_launcher); 
  map2.put("text", "xxx说明xxx"); 
  data.add(map); 
  data.add(map2); 
  simpleadapter simpleadapter = new simpleadapter(this, data, r.layout.activity_item, new string[] { "logo", "text" }, new int[] { r.id.imageview1, r.id.textview1 }); 
  // 设置显示的数据 
   spinner.setadapter(arrayadapter); 
  //spinner.setadapter(simpleadapter); 
  toast.maketext(getapplicationcontext(),"main thread"+ spinner.getitematposition(spinner.getselecteditemposition()), toast.length_long).show(); 
  // 注册事件 
  spinner.setonitemselectedlistener(new adapterview.onitemselectedlistener() { 
   @override 
   public void onitemselected(adapterview<?> parent, view view, int position, long id) { 
    // string content = arr[position]; 
    spinner spinner = (spinner) parent; 
    toast.maketext(getapplicationcontext(), "xxxx" + spinner.getitematposition(position), toast.length_long).show(); 
   } 
   @override 
   public void onnothingselected(adapterview<?> parent) { 
    toast.maketext(getapplicationcontext(), "没有改变的处理", toast.length_long).show(); 
   } 
  }); 
 } 
 @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; 
 } 
}

效果如下：

 

二、使用xml作为数据源（非本人代码）

布局文件：

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
 <string-array name="plantes"> 
  <item>nokia</item> 
  <item>moto</item> 
  <item>htc</item> 
  <item>lg</item> 
  <item>其他</item> 
 </string-array> 
</resources>

java代码：

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.textview; 
public class spinneractivity extends activity { 
 private textview view2; 
 private spinner spinner2; 
 private arrayadapter adapter2; 
 @override 
 protected void oncreate(bundle savedinstancestate) { 
  // todo auto-generated method stub 
  super.oncreate(savedinstancestate); 
  setcontentview(r.layout.spinner); 
  spinner2 = (spinner) findviewbyid(r.id.spinner02); 
  view2 = (textview) findviewbyid(r.id.spinnertext02); 
  //将可选内容与arrayadapter连接起来 
  adapter2 = arrayadapter.createfromresource(this, r.array.plantes, android.r.layout.simple_spinner_item); 
  //设置下拉列表的风格 
  adapter2.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item); 
  //将adapter2 添加到spinner中 
  spinner2.setadapter(adapter2); 
  //添加事件spinner事件监听 
  spinner2.setonitemselectedlistener(new spinnerxmlselectedlistener());
  //设置默认值 
  spinner2.setvisibility(view.visible); 
 } 
 //使用xml形式操作 
 class spinnerxmlselectedlistener implements onitemselectedlistener{ 
  public void onitemselected(adapterview<?> arg0, view arg1, int arg2, long arg3) { 
   view2.settext("你使用什么样的手机："+adapter2.getitem(arg2)); 
  } 
  public void onnothingselected(adapterview<?> arg0) { 
  } 
 } 
}

希望本文所述对大家android程序设计有所帮助。