Android控件Spinner实现下拉列表及监听功能

<Spinner   android:layout_width="match_parent"  android:layout_height="wrap_content"  android:id="@+id/spinner2"  android:entries="@array/spingarr"  />

<?xml version="1.0" encoding="utf-8"?><resources>  <string-array name="spingarr">   <item>北京</item>   <item>上海</item>   <item>广州</item>   <item>深圳</item>   </string-array></resources>

package com.example.testspanner;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.widget.ArrayAdapter;import android.widget.Spinner;public class MainActivity extends Activity {private Spinner spinner;private List<String> data_list;private ArrayAdapter<String> arr_adapter;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.spinner);    spinner = (Spinner) findViewById(R.id.spinner);    //数据    data_list = new ArrayList<String>();    data_list.add("北京");    data_list.add("上海");    data_list.add("广州");    data_list.add("深圳");    //适配器    arr_adapter= new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, data_list);    //设置样式    arr_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);    //加载适配器    spinner.setAdapter(arr_adapter);  }}

<Spinner   android:layout_width="match_parent"  android:layout_height="wrap_content"  android:id="@+id/spinner"  />

 mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() {//选择item的选择点击监听事件           public void onItemSelected(AdapterView<?> arg0, View arg1,               int arg2, long arg3) {             // TODO Auto-generated method stub             // 将所选mySpinner 的值带入myTextView 中              myTextView.setText("您选择的是：" + arg2+"个");//文本说明           }           public void onNothingSelected(AdapterView<?> arg0) {             // TODO Auto-generated method stub             myTextView.setText("Nothing");           }         });