Android编程开发之Spinner控件用法实例分析

时间:2022-10-06 08:56:16

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:

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<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

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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:

 Android编程开发之Spinner控件用法实例分析

二、使用xml作为数据源(非本人代码)

布局文件:

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<?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:

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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。