Android中Spinner控件之键值对用法实例分析

本文实例讲述了android中spinner控件之键值对用法。分享给大家供大家参考。具体如下：

一、字典表，用来存放键值对信息

package com.ljq.activity;
import java.io.serializable;
@suppresswarnings("serial")
public class dict implements serializable {
 private integer id;
 private string text;
 public dict() {
 }
 public dict(integer id, string text) {
  super();
  this.id = id;
  this.text = text;
 }
 public integer getid() {
  return id;
 }
 public void setid(integer id) {
  this.id = id;
 }
 public string gettext() {
  return text;
 }
 public void settext(string text) {
  this.text = text;
 }
 /**
  * 为什么要重写tostring()呢？
  * 
  * 因为适配器在显示数据的时候，如果传入适配器的对象不是字符串的情况下，直接就使用对象.tostring()
  */
 @override
 public string tostring() {
  return text;
 }
}

二、activity类，绑定数据、获取选中的键值对

package com.ljq.activity;
import java.util.arraylist;
import java.util.list;
import android.app.activity;
import android.os.bundle;
import android.view.view;
import android.widget.adapterview;
import android.widget.arrayadapter;
import android.widget.spinner;
import android.widget.toast;
import android.widget.adapterview.onitemselectedlistener;
public class mainactivity extends activity {
 private spinner myspinner;
 @override
 public void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.main);
  myspinner = (spinner) findviewbyid(r.id.myspinner);
  list<dict> dicts = new arraylist<dict>();
  dicts.add(new dict(1, "测试1"));
  dicts.add(new dict(2, "测试2"));
  dicts.add(new dict(3, "测试3"));
  dicts.add(new dict(4, "测试4"));
  arrayadapter<dict> adapter = new arrayadapter<dict>(this,
    android.r.layout.simple_spinner_item, dicts);
  myspinner.setadapter(adapter);
  myspinner.setonitemselectedlistener(new onitemselectedlistener(){
   public void onitemselected(adapterview<?> parent, view view,
     int position, long id) {
    // 获取键的方法：myspinner.getselecteditem().tostring()或((dict)myspinner.getselecteditem()).getid()
    // 获取值的方法：((dict)myspinner.getselecteditem()).gettext();
    toast.maketext(mainactivity.this,
      "键:" + myspinner.getselecteditem().tostring() + "、" + ((dict) myspinner.getselecteditem()).getid() + 
      "，值:" + ((dict) myspinner.getselecteditem()).gettext(),
      toast.length_long).show();
   }
   public void onnothingselected(adapterview<?> parent) {
   }
  });
 }
}

三、修改main.xml布局文件

<?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:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:id="@+id/myspinner"/>
</linearlayout>

四、运行结果如下：

希望本文所述对大家的android程序设计有所帮助。