[python] 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"
  />

ySpinner.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");
     }
     });