Spinner的使用方法

spinner_demo.xml这个布局文件的写法如下：

<?xml

version="1.0"

encoding="utf-8"?>

<linearlayout

xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

>

    <spinner

        android:id="@+id/spinner1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

/>

    <textview

        android:id="@+id/textview1"

        android:layout_width="wrap_content"

        android:text="被选中的人名显示在下面"

        android:textsize="25sp"

        />

</linearlayout>

aspinner

package com.example.uidemo3;

import java.util.arraylist;

import android.r.anim;

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 aspinner extends activity {

       spinner spinner1;

       arraylist<string> arraylist = new arraylist<string>();

       textview textview1;

       onitemselectedlistener onitemselectedlistener = new onitemselectedlistener() {

              /*

               * parent the adapterview where the selection happened

               *view the view within the adapterview that was clicked

         *position the position of the view in the adapter

         *id the row id of the item that is selected

         *

         *adapterview<?>代表spinner

         *view代表spinner里面的item

               */

              @override

              public void onitemselected(adapterview<?> parent, view view,

                            int position, long id) {

                     textview1.settext( ((textview)view).gettext());

              }

              public void onnothingselected(adapterview<?> parent) {

       };

       @override

       protected void oncreate(bundle savedinstancestate) {

              super.oncreate(savedinstancestate);

              this.setcontentview(r.layout.spinner_demo);

              spinner1 = (spinner) this.findviewbyid(r.id.spinner1);

              textview1 = (textview) this.findviewbyid(r.id.textview1);

              arraylist.add("小仓优子");

              arraylist.add("苍井空");

              arraylist.add("松岛枫");

              arraylist.add("波多野结衣");

              arraylist.add("樱田樱");

              arraylist.add("小峰由衣");

              arraylist.add("早乙女");

              arraylist.add("小泉彩");

              // 适配的概念adapter,主要负责适配数据和各种样式

              // 下拉菜单的样式

              @suppresswarnings({ "unchecked", "rawtypes" })

              arrayadapter arrayadapter = new arrayadapter(this,

                            android.r.layout.simple_spinner_item, arraylist);

              // 以下显示的是一行，只有一行能看的见

              // arrayadapter.setdropdownviewresource(android.r.layout.simple_dropdown_item_1line);

              // 这种是带有文本和radio的下拉效果。

              arrayadapter.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item);

              // arrayadapter.setdropdownviewresource(android.r.layout.simple_spinner_item);

              // 为下拉的spinner设置内容

              spinner1.setadapter(arrayadapter);

              //为spinner1设置监听事件

              spinner1.setonitemselectedlistener(onitemselectedlistener);

       }

}