Android编程开发之Spinner组件用法

本文实例讲述了Android编程开发之Spinner组件用法。分享给大家供大家参考,具体如下:

Spinner组件组要用显示一个下拉列表,在使用中需要用到适配器Adapter,下面是一个该组件的使用示例

首先是布局文件main.xml:

 
 
  
 
 

由于用到simpAdapter所以要写子项Item的布局如下 item.xml:

 
 
  
  
 

下面是代码:

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import android.app.Activity; 
import android.app.AlertDialog; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.SimpleAdapter; 
import android.widget.Spinner; 
import android.widget.AdapterView.OnItemSelectedListener; 
public class Main extends Activity 
{ 
 @Override 
 public void onCreate(Bundle savedInstanceState) 
 { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.main); 
  //获取对象 
  Spinner spinner1 = (Spinner) findViewById(R.id.spinner1); 
  String[] applicationNames = new String[] 
  { "多功能日历", "eoeMarket客户端", "耐玩的重力消砖块", "白社会", "程序终结者" }; 
  ArrayAdapter aaAdapter = new ArrayAdapter(this, 
    android.R.layout.simple_spinner_item, applicationNames); 
  // 将如下代码可以使列表项带RadioButton组件 
  // aaAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
  spinner1.setAdapter(aaAdapter); 
  Spinner spinner2 = (Spinner) findViewById(R.id.spinner2); 
  final List> items = new ArrayList>(); 
  Map item1 = new HashMap(); 
  item1.put("ivLogo", R.drawable.calendar); 
  item1.put("tvApplicationName", "多功能日历"); 
  Map item2 = new HashMap(); 
  item2.put("ivLogo", R.drawable.eoemarket); 
  item2.put("tvApplicationName", "eoeMarket客户端"); 
  items.add(item1); 
  items.add(item2); 
  SimpleAdapter simpleAdapter = new SimpleAdapter(this, items, 
    R.layout.item, new String[] 
    { "ivLogo", "tvApplicationName" }, new int[] 
    { R.id.ivLogo, R.id.tvApplicationName }); 
  spinner2.setAdapter(simpleAdapter); 
  //为Spinner2加上监听事件 
  spinner2.setOnItemSelectedListener(new OnItemSelectedListener() 
  { 
   @Override 
   public void onItemSelected(AdapterView parent, View view, 
     int position, long id) 
   { 
     new AlertDialog.Builder(view.getContext()).setTitle( 
       items.get(position).get("tvApplicationName") 
         .toString()).setIcon( 
       Integer.parseInt(items.get(position).get("ivLogo")
         .toString())).show(); 
   } 
   @Override 
   public void onNothingSelected(AdapterView parent) 
   {
   } 
  }); 
 } 
}

希望本文所述对大家Android程序设计有所帮助。

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