android入门 spinner

package com.zte.android.lession;     import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Spinner;import android.widget.Toast;/** * @author rychenga *  * 一个spinner、2个button 组件 * 单击button时完成spinner的数据获取操作 */public class Activity_011_Spinner extends Activity{private Button btn1 ;private Button btn2 ;private Spinner spinner ;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.activity_011_spinner_layout);//初始化组件btn1 = (Button)findViewById(R.id.l011_button1);btn2 = (Button)findViewById(R.id.l011_button2);spinner = (Spinner)findViewById(R.id.l011_spinner1);btn1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubToast.makeText(Activity_011_Spinner.this, String.valueOf(spinner.getCount()), Toast.LENGTH_LONG).show();}});btn2.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubToast.makeText(Activity_011_Spinner.this, String.valueOf(spinner.getSelectedItem()),Toast.LENGTH_LONG).show();}});}}

<?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/l011_spinner1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:entries="@array/activity_011_items" />    <Button        android:id="@+id/l011_button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="显示选项数" />    <Button        android:id="@+id/l011_button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="显示选项" /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><resources>    <string-array name="activity_011_items">        <item>选项一</item>        <item>选项二</item>        <item>选项三</item>        <item>选项四</item>        <item>选项五</item>        <item>选项六</item>    </string-array></resources>

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